Anil Puchchkayala_Thesis
Contents
1. 29 Wearable and Mobile Computing Support for Field Service Engineers EL007A Anil Puchchkayala 5 Results November 26 2013 x osm About Howitworks Support API Q j anil x Connect to your world A feed last updated Thu 02 Aug 2012 11 06 17 0200 0 environmenttem 37 54 Currently LE 0 2 3 LJ 3 23 97 Cc 5 00 8 00 4 relativehumidity Currently 42 22 2 heartbeat 125 rn Currently k 91 0 34 76 5 00 8 00 11 00 3 bodytemperature vshowtriggers amp 110 m Currently 35 82 18 7 5 00 8 00 Figure 5 3 Sensors data stored in server 30 Wearable and Mobile Computing Support for Field Service Engineers EL007A Anil Puchchkayala 6 Discussion November 26 2013 DISCUSSION Wearable and mobile computing technologies are providing more advantages to the field service engineers in the work areas In the present thesis we developed a wear able automated safety suit for monitoring the field service engineers activities in the work fields It is mainly developed for the field service engineers for detecting the hazardous conditions in the work environment In the present prototype we selected a different kind of sensor for monitoring the worker environment and health condi tions The sensors are selected according to the safety suit specification based upon the requirements Presently there are different technologies are available for commu nicating the safety suit2. 6 Sparkfun electronics TMP36 Temperature Sensor URL https www sparkfun com products 10988 Accessed April 11 2012 17 7 J D AUNORAS A DOSINAS M VAITAKUNAS Measurement of human physi ological parameters in the system of active clothing and wearable technologies Medicine Technology 71 1392 1215 2006 16 8 P EDRO BRANDAO Abstracting information on body area networks Technical report University of Cambridge Computer Laboratory 2012 27 9 S UMNER M BARRATT C PALETHORPE B GREENHALGH C STORZ O FRIDAY A HUMBLE J SETCHELL C RANDELL C MULLER H CROWE J HAYES GILL B Modular sensor architecture for unobtrusive routine clini cal diagnosis In International Workshop on Smart Applicances and Wearable Computing 2004 9 10 S S CARMAGNANI J HAYES D DIAMOND S COTLE Wireless sensor net work and chemo biosensing Chem Rev 2008 7 35 Wearable and Mobile Computing Support for Field Service Engineers EL007A Anil Puchchkayala REFERENCES November 26 2013 11 12 ey 13 14 15 16 17 18 19 20 21 Lucy E DUNNE The Design of Wearable Technology Addressing the Human Device Interface Through Functional Apparel Design Master s thesis Cornell University New York United States 2010 5 STIVORIC J BAUER M amp MARTIN R GEMPERLE F KASABACH C De sign for wearability Paper presented at the 2nd International Symposium on Wea
3. Table 5 1 Comparision between Bluetooth 2 zigbee and ANT technologies 4 5 3 Comparision between Wired and Wireless technolo gies BAN is body area network It is used for interconnecting the sensors inside the safety suit There are two types of bans are available wired and wireless cause in this case we are using only one device and remaining sensors are con nected by using connective thread Property Wired BAN Wireless BAN Energy Consumption Low Too high Data Rates The speed depends on length Too high of the smart fabric Interference There is no interference be More interference will occur because of multiple wireless sensor nodes Node placement Is critical in wired BAN We can easily place new node in Wireless BAN Battery Replacement very easy It is difficult to change the batteries in every node Table 5 2 Comparision between wired Vs Wireless 8 The above Table shows the different properties of wired and wireless BAN Both wireless and wired BAN have advantages and disadvantages Depending upon par ticular application we opt for either wired and wireless BAN Particularly for intra 27 Wearable and Mobile Computing Support for Field Service Engineers EL007A Anil Puchchkayala 5 Results November 26 2013 BAN communication wired BAN is better than wireless Considering present project application there are several reasons why wired commu
4. supervisor the communication Safety suit The automated safety suit is a wearable garment used for monitoring the users and environmental conditions such as CO gas levels temperature and humidity levels etc The safety suit consists of several sensors and actuators Moreover it has a cen tral processing unit CPU for transmitting and receiving sensors data to the mobile device via Bluetooth Mobile device The major principle of the mobile device is used to gather the entire sensor data from the safety suit Finally the mobile device is responsible for detecting abnormal conditions and provides immediate warning to the users Command center The command center is used to store the real time multi sensor data coming from the mobile device The received information is stored in the database for a long term and it can be used for preventing the potential life threatening 12 Wearable and Mobile Computing Support for Field Service Engineers EL007A Anil Puchchkayala 3 Methodology November 26 2013 Supervisor The supervisor plays key role in managing the field service engineers and pro viding the tasks at work locations In case of any emergency situations supervisor is responsible Communication For shorter distance Bluetooth communication is used and for long range dis tance mobile network 3G GPRS can be used The complete wearable system consists of two major components The first one is the autom
5. Support for Field Service Engineers EL007A Anil Puchchkayala 4 Design and Implementation November 26 2013 WASS contains three activities such as Loginaccess activity AbbWearable activity and Graphview activity which is implemented in this application The classes are shown in the WASS application class diagram Figure 4 4 WASS starts with a login screen which enables user to enter his credentials WASS login screen is depicted in Figure 4 5 5 WearableAdvancedSafetySuit WASS Version 0 01 Username Password Figure 4 5 Android application login screen Loginaccess is a class which extends activity in Android This activity contains GUI components like relative layout text views edit texts and buttons which are initialized from this class GUI components are layouts which are loaded from an XML file in the resource folder This class is used to access the resources from anywhere in the application Figure 4 6 shows the main screen of the Android application after login ApbWearable activity is the main class of the Android application and it contains GUI compo nents such as layouts text view and buttons In this activity the Bluetooth UUID is initialized for connecting to the safety suit ArcduinoReciver is the subclass in AbbWearable activity it extends to the BroadcastReciver class It reads the sensor data from the Bluetooth port when the data are available and it will split the data and display to the user And
6. and activities 16 Ubiquitous computing employs many computational devices and systems which people can forget and interact with without actively thinking of them Therefore in order to make this computing approach in real time development in the miniaturization of electronics and new types of specialized user interfaces for ubiqui tous applications is needed People are becoming accustomed to small and light elec tronic appliances such as mobile phones Personal Digital Assistants PDAs Global Positioning System GPS devices etc which indicates that the new technological equipment is well accepted by the market Persons can easily carry these devices by embedding them in clothing accessories which are generally known as wearable electronics appliances 14 Departments related to military civil and medical sciences are showing keen interest in research and development of an intelligent approach which addresses the required safety measures such as heartbeat body temperature environment temper ature and humidity levels A wearable system composed of electronic and control components is implemented into a field service engineer s wearable garment in order to meet the purpose The main aim of this wearable system is to register field service engineer s phys iological parameters environmental parameters and to analyze these parameters con tinuously in order to know about sudden health state changes and accidental injury during their
7. and mobile device Bluetooth ANT and ZIGBEE technologies are providing more advantages in wearable computing In the present prototype we have selected Bluetooth communication because It provides high data rates and the power consumption is low It consumes less energy compared to the other technolo gies The goal of this work was to design a wearable safety suit and mobile application for monitoring the field service engineers health and environmental conditions in the working area The safety suit provides the early warnings to the service engineer and send these alerts to the supervisor in case of any emergency occurred in the field was presented In future we are going to add more functionalities to the wearable safety suit like finding the nearest exit point in the field in case of emergency and sending emergency alerts to the nearest possible person in the work area In realistic the worker has to be on site for 8 hours in a day and as we can see that the battery was used on an average of 3hours 40 minutes with 1 2V rechargeable battery at 1000mAh So the worker should have to replace the battery every 4hours approximately This might be quite disappointment for a field worker So there is in need for modification in power circuit module in the micro controller where for example with 4 5V non round battery with typical capacity of 6100mAh can be placed that could work for 3 days approximately 31 Wearable and Mobile Computing Support f
8. batteries to power up the mi crocontroller The battery holder is having an inbuilt regulator to regulate the power supply Sensors and actuators are connected to microcontroller by using the conduc tive thread The design of the automated safety suit is shown in Figure 4 2 Input Sensors od _ a V Lilypad g Arduino Gi _ Vibrator Figure 4 2 The design of the automated safety suit In this prototype BAN protocol is used for connecting the sensors inside the safety suit BAN is a body area network which is divided into the two categories such as wired and wireless 23 Wired BAN transfers the data between the sensors and microcontroller using the conductive threads and the power is distributed in the same thread Bluetooth radio is one of the important components in automated safety suit design which will transmit the data from the suit to the mobile device The firefly Bluetooth device is used in this prototype and it is connected to the microcontroller via serial interface The Amarino tool kit is used for transferring the data from the suit to the mobile phone via Bluetooth Amarino is a tool kit that provides two primary components which are Android application and Arduino library Amarino creates the communication channel be tween the mobile phone and the microcontroller for sending and receiving the data via Bluetooth between the phone and microcontroller Arduino library has a callback m
9. during my thesis I would like to thank Dr Benny Thornberg for his invaluable discussions ex amining my thesis comprehensive suggestions and corrections to the final report I would like to thank my beloved parents for their unconditional support and motivation during my studies IT had a great time working with my fellow thesis workers at ABB and I would like to thank them for providing me a friendly work environment humorous discussions during our lunch and coffee breaks Last but not least I would like to thank my friends who were always encouraging and supporting to attain my goals ii Wearable and Mobile Computing Support Preface for Field Service Engineers EL007A Anil Puchchkayala SR PREFACE This report is about my thesis project carried out at ABB Corporate Research Centre Vasteras from April Ist 2012 to August 10th 2012 This master thesis is also the last part of my education in the International Masters degree with the specialization in Electronics Design at Mid Sweden University Sundsvall Sweden This project is within the design and development of electronic systems for wearable applications with the SARU Group at ABB Corporate Research Vasteras The focus of the team was to research and implement new wearable technology for industrial field service engineers The tasks were challenging and we successfully developed a prototype sys tem that has assisted me in understanding development of wearable system
10. increased to eight hours which makes the automated safety suit more efficient for the workers in confined spaces This android application sends alerts only to the supervisor of the field worker However the prototype can be extended in future to handle alerts to the technicians who are in close range of the work field to avoid problematic situations 33 Wearable and Mobile Computing Support for Field Service Engineers EL007A Anil Puchchkayala 7 Conclusions and Futurework November 26 2013 34 Wearable and Mobile Computing Support for Field Service Engineers EL007A Anil Puchchkayala REFERENCES November 26 2013 REFERENCES 1JArduino 2012 URL http www arduino cc en Main ArduinoBoardLilyPad Accessed April 11 2012 18 2 Power consumption analysis of bluetooth low energy zigbee and ant sen sor nodes in a cyclic sleep scenario http www csr com sites default files white papers comparisons_between_low_ power_wireless_technologies pdf Accessed April 28 2012 27 3 Sensirion 2012 Digital Humidity and Temperature Sensor Doc URL http www sensirion com en products humidity temperature humidity sensor shtl1 Accessed June 14 2012 17 4 Sparkfun electronics Bluetooth Gold Mate URL https www sparkfun com products 9358 Accessed April 11 2012 27 S Sparkfun electronics Conductive Thread 234 34 4ply URL https www sparkfun com products 8549 Accessed April 11 2012 15
11. local is used for storing the sensor data into the local database in the XML format which is very useful to document when accidents occur and also to prevent the accidents in future Storing the sensor data into the local database avoids a lot of paper work The third tab Graph activity is used for displaying the body temperature and environment temperature in a graphical manner The data from the automated safety suit is sent to the mobile phone which in turn sends all the information to the server to store the information on the web since server acts as a backend command central Figure 5 3 shows the information from the various sensors which are stored in the server database 24 Wearable and Mobile Computing Support for Field Service Engineers EL007A Anil Puchchkayala 5 Results November 26 2013 RESULTS 5 1 Performance of the automated safety suit The functionality of the automated safety suit was verified at indoors in ABB Cor porate Research center Each and every sensor is tested alone before whole system was tested During the period of testing the performance of the automated safety suit was observed The observed test includes situations sending an emergency message to supervisor e g high environmental temperature The components in the safety suit are well balanced and finally the appearance of the suit was like ordinary suit To verify the automated safety suit we have tested with one person inside and outsid
12. meet the robustness func tionality and ergonomics several areas are required to be advanced 26 Some of the most important areas can be grouped and is depicted in Figure 2 2 and as follows e Energy source e Network architecture e Transducers Robust packaging Wearability User interface Ch Ch Wearable Caner 7 interface Figure 2 2 Advanced wearable system 2 1 1 1 Energy source Energy is one of the primary limiting factors when designing a wearable system The main source of energy in wearable system is the battery Over the past decade capac ity of batteries has increased but they are not being up to the mark with the increasing Wearable and Mobile Computing Support for Field Service Engineers EL007A Anil Puchchkayala 2 Introduction to Wearable Computing November 26 2013 power demands of wearable systems Batteries are categorized into two types which are primary and secondary Primary batteries are used once and discarded after the life whereas secondary batteries are rechargeable batteries In the aspect of wearable garment secondary batteries are well suited for long term and in prospective of cost efficient and environmental aspects In order to extend the limited capacity of bat teries power supply strategies have been introduced These are summarized in three main categories which are low power design power management and power harvest ing Optimization of hardware architecture i
13. of the problem domain 11 3 2 Wearable system Designing criteria 11 3 3 System architecture wc we esse rr rss ee ew 12 3 3 1 Wearable automated safety suit algorithm 14 iv Wearable and Mobile Computing Support for Field Service Engineers EL007A NE i ppo Anil Puchchkayala 4 Design and Implementation 15 Aol Safety SUI o soc ee i Gee er dee dok eee ee Re ek 13 AlCl SOWSOtS So amp a fruar fe as mima ee AR Ner And den ee eS 13 4 1 2 Feedback devices lt u eee rss ss see ae x 17 4 1 3 Emergency panic button 2 18 4 1 4 Electronics integration into automated safety suit 18 4 1 5 Working procedure of the safety suit 20 4 2 Mobile application sosse rss ss ss 0 202 000 0004 21 4 2 1 Wearable advanced safety suit 21 5 Results 25 5 1 Performance of the automated safety suit c 25 5 2 Comparision between Bluetooth Zigbee and ANT technologies 25 5 3 Comparision between Wired and Wireless technologies 21 5 4 Automated safety suit power analysis 28 5 4 1 Theoretical power analysis 00 2 28 5 4 1 1 Practical test results 224 64 4845 24 28 6 Discussion 31 7 Conclusions and Futurework 33 References 35 A Appendix1 User Manual 38 Wearable and Mobile Computing Support for Field Service Engineers EL007A e 3 Anil Pu
14. phone call to the supervisor e Store the sensor data in the mobile application database in XML format and send it to the server e Study and analyze the battery life time of the Wearable safety suit with an ex periment test 1 5 Contribution The proposal for this thesis work was put forward by the ABB Corporate Research as a part of the wearable application project within the SARU Group unit In this thesis work the automated safety suit and supervision application were developed by me to ensure the safety of the field service engineers at working environments The implementation execution and evaluation part of this work was done by me with the help of Use cases provided by ABB Corporate Research 1 6 Outline The whole report is structured into six chapters In chapter 2 It starts with a brief overview and examples of the wearable tech nologies In chapter 3 presents an analysis of the problem domain and the proposed solution system architecture is explained In the next chapter 4 describes the design and implementation of the wearable system In chapter 5 we have discussed the pre liminary results of the wearable system In chapter 6 we have concluded and outlined the future improvements in wearable system Wearable and Mobile Computing Support for Field Service Engineers EL007A Anil Puchchkayala 1 7 About ABB Corporate Research 1 Introduction November 26 2013 ABB Corporate Research in Vasteras is one
15. provid ing the assistances in work places Moreover these can also help people with the tools for coping with a range of tasks There are few examples of integrated e textile cloth ing applications Wearable applications include more mobile computing equipments portable music player heart rate monitors and wrist worn computers etc These can be utilized while moving So these applications are usually used for hobbies and entertainment purpose Several examples are discussed in the section below Wearable and Mobile Computing Support for Field Service Engineers EL007A Anil Puchchkayala 2 Introduction to Wearable Computing November 26 2013 2 2 1 Wearable applications at workplaces Wearable electronics provide the benefits for the people in a wide range of work en vironments These are supported in both mobile office and dangerous environments such as military the rescue services as well as in space However most of the wear able applications are related to manufacturing maintenance and inspection tasks 15 For example in aircraft maintenance repair and inspection are also served Wear able computer gives additional information as well in diagnosis troubleshooting and repair Moreover when the information is available through wearable systems signif icant time saving can be achieved Wearable computers have been proposed for warehousing and inventory control many years ago Most of the industrial applications nee
16. role in developing the automated safety suit for monitoring the field service engineers health and environmental conditions In this thesis some of the parameters are mainly considered according to the use cases These use cases are conducted by the ABB Corporate Research center Some of the parameters are explained below Selection of the sensors When developing a wearable automated safety suit while choosing the sensors 15 Wearable and Mobile Computing Support for Field Service Engineers EL007A Anil Puchchkayala 4 Design and Implementation November 26 2013 Automated safety suit Alert Buzzer Emergency Button Heart Rate CO Gas Main Control Unit Skin Temperature External Humidity amp Temperature Viber Alert Figure 4 1 Sensor locations inside the safety suit special attention must be taken regarding the size and its position on the body The sensors should not obstruct the wearer while daily activities are carried out For this prototype the author has chosen appropriate sensors based on the sensitivity low power consideration and robustness 27 Heartbeat The heartbeat sensor is used for finding the heart rate of the users It is the biggest factor in the ability of the medical officials see the signs of distress Low and high heart rates for a long time causes the cardiovascular health 25 Photo plethysmography is one of the methods for calculating the pulse measurement The pu
17. state of the art wearable systems Some of the parameters are considered in selecting the transducers for designing a wearable system The system must be of low cost flexible low power while still robust washable or reusable 10 Miniaturization is the key factor for building unobtrusive hardware in wearable system Unobtrusive hardware with low power consumption higher operating speeds and high ubiquity are made using nanotechnology in textile materials 2 1 1 4 Robust packing One of the primary considerations in designing a wearable system is robustness Frag ile designs are not acceptable as it they require a high degree of maintenance when it Wearable and Mobile Computing Support for Field Service Engineers EL007A Anil Puchchkayala 2 Introduction to Wearable Computing November 26 2013 comes to wearable system The electronic parts that are not well stress relieved will eventually turns to system failure in a short period of time Therefore robustness is not only related to mechanical but also to electrical issues as well as to computer science issues Electrostatic discharges and electronic magnetic fields should be im mune to the system and as well as to coexist with neighboring systems and emitting peripherals 2 1 1 5 Wearability Physical comfort and wearability are to be considered when mounting wearable de vice on the body The intended functionality counteract with poor design of an internal intelligent ga
18. to the Pachube server and it will store the data in mobile database 40
19. work Emerging wireless communication technologies have make it pos sible to include embedded platform with desktop platform to control and monitor the system Utilizing wireless communication devices such as PDAs and mobile phones makes it easier to communicate the sensor devices practically Size reduction of elec tronic systems is one major issue in designing the prototype so that the wearable gar ment will be more comfortable to the end user Thus care must have taken to include sensors into the automated safety suit and to ensure the successful communication between automated safety suit and mobile devices 1 1 Background and problem motivation In an estimation given by the international labor organization two million people die every year from work related accidents and diseases across the world 13 For the sake of workers in industries such as factories and plants precautions are taken during work Wearable and Mobile Computing Support for Field Service Engineers EL007A Anil Puchchkayala 1 Introduction November 26 2013 operations Nearly 160 million people are diagnosed due to work related diseases and estimation of 270 million people are affected due to fatal and non fatal work related accidents every year It is important to make industrial workplaces safer and it is possible through wearable and mobile computing approach to prevent or reduce the accidents Field service engineers often need to execute work orders i
20. 15 3 sensor is used since it is fully calibrated and also the quality and accuracy of the sensor is high The sensor is integrated into the workers safety suit and connected via microcontroller by using conductive thread 4 1 2 Feedback devices Feedback devices are playing major role in wearable applications They provide the physical alerts to the user when abnormal conditions are detected In this prototype the author used speaker and vibrator for giving the notifications to the field service engineer The speaker is located on the chest and the vibrator is located on the hip 17 Wearable and Mobile Computing Support for Field Service Engineers EL007A Anil Puchchkayala 4 Design and Implementation November 26 2013 4 1 3 Emergency panic button The additional feature in this prototype is an emergency panic button It is integrated into an automated safety vest and located in right hand shoulder position The func tionality of the emergency panic button is to send an alert signal to the workers mobile phone by pressing the button when the worker is in danger situation or any minor health problems The mobile application will make a phone call and or send an email or SMS to the supervisor of the field worker Moreover the mobile application is responsible for updating the command center and sending sensor data to a server 4 1 4 Electronics integration into automated safety suit Arduino LilyPad is an open source hardwar
21. RADU COR MAC FAy Wearable sensing application carbon dioxide monitoring for emer gency personnel using wearable sensors ICESE 2009 International Confernce on Environmental Systems Engineering 2009 Venice Italy 16 37 Wearable and Mobile Computing Support REFERENCES for Field Service Engineers EL007A N ber 26 2013 Anil Puchchkayala enh 38 Wearable and Mobile Computing Support A Appendix User Manual for Field Service Engineers ELO07A November 26 2013 Anil Puchchkayala APPENDIX1 USER MANUAL Pre Requirements for Wearable safety application 1 Safety vest 2 Android mobile minimum android version 4 0 or later version is required and preferred Google Nexus 19250 smartphone 3 WASS Android application developed at ABB 4 Bluetooth RSSI pro android application is required download freely available application from android store https play google com store apps details id at abraxas amarino Safety Suit Instructions 1 Place the 1 2 v AAA battery into the holder before placing the battery check the signs and turn on the power button 2 Wear the suit and connect the ear clip sensor to the right ear and attach the body temperature sensor to the body which is located at under the ribs up to the belly Android Application Instructions 1 Install WASS and Bluetooth RSSI pro applications in mobile 2 After installing two applications open the Bluetooth RSSI pro application and sea
22. Sj lvst ndigt arbete p avancerad niv Independent degree project second cycle Electronics Design Wearable and Mobile Computing support for Field Service Engineers ELOO7A Anil Puchchkayala oh Mittuniversitetet MID SWEDEN UNIVERSITY Campus H rn sand Unverstetshacken 1 SE 871 89 Campus Sundsvall Homgatan 10 SE 85 70 Suncsvall Campus stersund Kunskapens vag 8 5E 831 25 Ostersund Phone 46 0 771 87 50 OD Fax 46 0 771 97 50 01 Wearable and Mobile Computing Support for Field Service Engineers EL007A Anil Puchchkayala Abstract November 26 2013 ABSTRACT Due to the rapid development in electronics and radio communication systems mod ern technologies are implemented to improve the safety and security of workplaces in order to save field service engineers lives and their health In this thesis an automated safety suit was implemented with integrated sensors for monitoring the safety of field service engineers The basic idea of the prototype is to ensure safety for the field service engineers who are working in adverse environmental conditions This safety suit includes embedded devices which can communicate with mobile devices and by means of that provides aid for the people working in several fields such as confined spaces high altitudes etc In this prototype a different type of sensors are proposed for monitoring environ mental and health conditions like temperature CO gas levels relative h
23. The worker should give the related response of the popped message in relation to the hazardous condition If the worker does not respond to this message then the mobile application will send the message to the supervisor of the work field which includes coordinates of the worker s location and sensor data which in turn indicates either an injury or a technical failure 20 Wearable and Mobile Computing Support for Field Service Engineers EL007A Anil Puchchkayala 4 2 Mobile application 4 Design and Implementation November 26 2013 The purpose of the Android application is to collect sensor data and display alerts and notifications on a mobile phone when it goes to abnormal conditions It application is presented in a simple and easy to use interface This application allows the user to monitor their vital signs and sensor data in a graphical manner The Android ap plication allows the supervisor of the work field or command center to view the vital signs of the field service engineer engaged in action This application will send the automatic SMS E mails to the supervisor of the work field with the details of the user location and type of alert is raised in that situation When the conditions are critical the application will make a phone call to the supervisor so that they could be alerted 4 2 1 Wearable advanced safety suit The wearable advanced safety suit WASS is an Android application running on smartphone that gathers v
24. according to industrial field service engineers environment Vasteras November 26 2013 Anil Puchchkayala iii Wearable and Mobile Computing Support for Field Service Engineers EL007A Rona Peo Anil Puchchkayala Table Of Contents Abstract i Acknowledgements ii Preface iii Terminology Notation vii 1 Introduction 1 1 1 Background and problem motivation 1 E2 Overallaim 42 4 ahs a a es AR a v AR A 2 Wes Scope a gasii ipia ode ia ge eG a eng Sng Bah Meda ed 2 1 4 Concrete and verifiable goals Low level Problem statement 2 IS Contribution a ss Bi a Bah d fer 45585 Sh aa 3 1 6 Outline gabe ed amp amp KR or Ree ania pea mi aeai e 3 1 7 About ABB Corporate Research 2004 4 2 Introduction to Wearable Computing 5 2 1 Wearable technology lt 6 5 s 8 uis via Ws Sod BSE So EES S 5 2 1 1 Wearable system sosse rss ss des ives 2 1 1 1 Energy source 22nd egies Sha ss ss SG dx 6 2 1 1 2 Network architecture a 2 1 1 3 Transducers 2 cos 2a s amp s 2 Se ss oss 7 2 1 1 4 Robust packing 2422 eeuy face ua Paw os 7 2 1 1 5 Wearability 22 oe 2 oe S e45e 2 S42 Se RS 8 2 1 1 6 Userinterface 4 2 05 2 d0 6 oe oS EE So eS 8 2 2 Wearable applications so sees rr 0 20000 00000 8 2 2 1 Wearable applications at workplaces 9 2 2 2 Wearable applications at medical andhealth 9 3 Methodology 11 3 1 Analysis
25. ated safety suit It contains the several sensors and actuators integrated inside the safety suit All the components are connected to the central processing unit CPU by using conductive material The BAN protocol is used for collecting the data from the sensors and Bluetooth modules is used for transmitting the data to the second component a mobile device The latter is used to organize the sensor data and take the decision according to the user specifications To be able to do so a supervising ap plication was developed The mobile application was initially set up with predefined sensor thresholds emergency contact number and e mail address of the supervisor These parameters can be adjusted by the field service engineer s before going to exe cute the work order on the site The mobile application stores the sensor data in XML format into the local database The retrieved information can be useful for further processing Therefore the mobile application can send the automated messages with the coordinates of the user location to supervisor and command central whenever the dangerous sensor levels are detected The system architecture is depicted in Figure Ll BAN Actuators CPU BT 4 Command 0 Central Mobile 3 Sensors Ms Supervisor GPS Sql database Figure 3 1 Overall architecture of the wearable automated safety suit monitoing sys tem 13 Wearable and Mobile Computing Support for Field Service Engi
26. chchkayala List Of Figures 2 1 Basic wearable system sosssssesrr So BS ss ss ss ss 5 2 2 3 1 3 2 4 1 4 2 4 3 4 4 4 5 4 6 4 7 5 1 5 2 5 3 Advanced wearable system oso moss ss ss ses ee es Overall architecture of the wearable automated safety suit monitoing SYSED cert eee eee ea RR RAR hae SSS See amp a Wearable automated safety suit algorithm and data flow Sensor locations inside the safety suit 2 00 The design of the automated safety suit Communication between mobile phone and automated safety suit WASS application class diagram ooo oss oss css svs ss Android application login screen oss oss ses ss svs ss Android main screen ew ss ss ses eS WASS application settings screen o oo a Left picture shows the advanced safety suit and right picture shows the Android application oo a Left picture shows the alert temperature notification and right picture shows the temperature alert message o oo ov vo Sensors data stored in server o o aoso oeo a e a a a 16 vi Wearable and Mobile Computing Support for Field Service Engineers EL007A Anil Puchchkayala Terminology Notation November 26 2013 TERMINOLOGY NOTATION Acronyms Abbreviations e BAN Body area network e BPM Beats per minute e BT Bluetooth device e CO Carbon monoxid
27. ds a comfortable wearable computer This wearable computer needs to fulfill factors such as light weight mini mal cabling no heat generation and uninterrupted setup which can be used for longer periods Radiation high temperatures and air shortage in air tubes may be life threatening situations for fire fighters By monitoring the environment for better communication and supervision between every single firefighter and head of the team there should be a smart clothing system which sustains at high temperatures 17 In disaster zones wearable computers are recommended to help rescuers such as providing assistance in locating team members and data collection 2 2 2 Wearable applications at medical and health In the recent past health monitoring wearables are commercially available namely Bodymedia This is designed with an armful of sensors for detection of heat flux skin temperature moment near body temperature and galvanic skin response In another research in the University of Birminghams developed a wearable system named as Sensvest 20 which is used for monitoring the sports activity A WEALTHY wear able health care system is a design of integrated sensors with the fabric of user clothes 22 This wearable system helps in the monitoring of patients diagnosed with heart diseases The University of Nottingham has developed a GRID 9 monitoring system that enables and displays the historical data live data and also performs data minin
28. dustrial environ ments CO is colorless odorless and tasteless gas and also it is not significantly de tected by human senses 19 In some cases people are dying when they are working in the industrial fields such as in confined spaces mines and at high altitudes It is extremely dangerous when people dont realize its existence 19 and may suffer with dizziness and headache One of the gas sensors FAGARO TGS 370 is used for detect ing the CO gas levels It consumes the least power and gives more reliable accurate data The CO sensor reads the gas levels which are measured in parts per million PPM and transmits the data to the service engineer mobile using Bluetooth via mi crocontroller The sensor is located to service engineer suit near to the chest location Environment temperature and humidity sensor Temperature is one of the complex issues in industrial working area as it will create thermal discomfort to the user and it is harmful to the person A hot working environment creates discomfort to the workers health efficiency and performance and also it will affect the workers heart rate lower body temperature and high sweat rate citeoutertemp High humidity with a longer period of time makes the problem worse under these conditions Therefore it is hard to perform work orders in these harsh working environments Several types of sensors are available for measuring the environmental temperature and humidity values In this thesis SHT
29. e e CPU Central processing unit e E textiles Electronic textiles e GPS Global positioning system e GUI Graphical user interface e HCI Human computer interaction e NIMH Nickel metal hydride e OHA Open handset alliances e PDA Personal digital assistance e PPE Personal protective equipment and safety e PPM Parts per million e RF Radio frequency e Rh Relative humidity e SMS Short message services e UI User interface vii Wearable and Mobile Computing Support for Field Service Engineers EL007A Anil Puchchkayala Terminology Notation November 26 2013 USB Universal serial bus UUID Universally unique identifier WLAN Wireless local area network XML Extensible mark up language C Degrees of celsius Vill Wearable and Mobile Computing Support for Field Service Engineers EL007A Anil Puchchkayala 1 Introduction November 26 2013 INTRODUCTION In early 1990s Mark Weiser had coined the phrase ubiquitous computing which is a post desktop model of Human Computer Interaction HCI Ubiquitous computing processes the information and has been thoroughly integrated into everyday objects
30. e the lab environment For testing the safety suit we had set the specific sensor thresholds in mobile according to the user requirements From the safety suit we got the some test results but still these are preliminary results only In the Figure 5 1 the left side shows the advanced safety suit and the right side of the figure represents the mobile application of the wearable advanced safety suit in real time The acquired sensors data were read out in mobile application which shows worker heart rate skin temperature and environment temperature humidity and CO gas levels In the following Figure 5 2 the left side shows notifications and right side of the figure shows alert sign when a worker is in the undesired environmental condition The result shows that the prototype developed was well suited for the field workers in determining their health and environmental conditions The washing test of the safety suit was not performed in this thesis work The sensors which are used in this safety suit are washable modules except heart beat sensor and Bluetooth modules Due to this before going to perform the washing test it is mandatory to remove the heart beat sensor and Bluetooth modules in the automated safety suit 5 2 Comparision between Bluetooth Zigbee and ANT technologies Table 5 1 shows the major properties of Bluetooth Zigbee and ANT All The above protocols are widely used for low power applications ANT also has similler prop ert
31. e toolkit which is used for integrating sen sors inside the worker garment Arduino LilyPad is a cost effective microcontroller and can easily be integrated inside the clothes It is specially designed for wearable ap plications where it is responsible for monitoring the sensors inside the worker garment and collecting their data Arduino LilyPad hardware contains Atmega 328 microcontroller Arduino Lily Pad controls the sensors used for the automated safety suit and it uses serial communi cation to transfer the data to the mobile phone with baud rate of 115200 It contains a multitude of analog and digital inputs and outputs Technical specifications of Atmega 328 microcontroller are described below 1 e 16k Flash memory e 1k SRAM for program memory 6 Analog to digital converter pins 14 Digital pins 6 PWM pins e 8 MHz microcontroller 512 bytes of EEROM Operating voltage 2 5v to 5 5v e DC Current per I O Pin40 mA e Open source programming e UART and SPI interfaces The Lily Pad microcontroller is placed on the worker s safety vest near to the hip The program for LilyPad is written in C programming language The microcontroller uses 5V power supply and the battery holder is connected to the microcontroller with 18 Wearable and Mobile Computing Support for Field Service Engineers EL007A Anil Puchchkayala 4 Design and Implementation November 26 2013 conductive thread Battery holder uses single 1 2 AAA
32. echanism for incoming events A developer reg isters one callback function for each expected event type and Arduino library will call the register function once an event has been received and then developer receives con venient functions to extract the data attached to the event 18 19 Wearable and Mobile Computing Support for Field Service Engineers EL007A Anil Puchchkayala 4 Design and Implementation November 26 2013 Sensors z Arduino Android i Amarino toolkit library Figure 4 3 Communication between mobile phone and automated safety suit The Meet Android library is used in the Arduino programming and this library provides convenient functions to develop programs for Arduino to send and receive data using Amarino communication channels Bluetooth RSSI is an android application It is used to manage Bluetooth con nections to create events These are to be sent to the Arduino device and monitor the sensor data 4 1 5 Working procedure of the safety suit When the sensors detect any abnormal situation then the safety suit is switched into the automatic mode and it will send the SMS and e mail automatically Prior to send ing a message the safety suit notifies the worker by means of an audio signal with a vibration alert Without any interaction from the user the message will send within a predefined time This time can also be changed by the worker in his mobile appli cation settings
33. ed approach which is needed to document what has happened during the emergency or abnormal situations Thus in order to avoid the human loss automated safety suit is implemented in this thesis to increase the field service engineers safety In this case the automated safety suit should be designed and implemented with mini mal loss of data low energy consumption and cost effective Wearable and Mobile Computing Support for Field Service Engineers EL007A Anil Puchchkayala 1 Introduction November 26 2013 e To design an automated safety suit for field service engineers using different sensors and actuators to monitor the environmental and health conditions at workplaces e To compare wired BAN and wireless BAN communications and implement one of them that is flexible with wearable automated safety suit which means to capture the field service engineer sensors data more accurately e To compare wireless technologies and implement suitable technology that is compatible with wearable automated safety suit which means to consume low energy that intern will provide longtivity of battery in safety suit during service e To design a supervision application for reading the sensor data from the safety suit and to make the decision according to the situation e Provide the early warnings to the field service engineer in case of any emergency situation in the working area and also send these warnings via SMS email and make an automatic
34. elakai Malaysia 2007 17 PSOMADELIS F BABER C BRISTOW W ARVANITIS N KNIGHT F SCHWIRTZ A The design of the sensvest Personal and Ubiquitous Com puting pp 16 19 2005 9 S JIMENEZ J GIPS A PENTLAND M SUNG R DEVAUL Shiver motion and core body temperature classification for wearable soldier health monitoring system in Proceeding of the 2004 IEEE International Symposium on Wearable Computers 2004 9 36 Wearable and Mobile Computing Support for Field Service Engineers EL007A Anil Puchchkayala REFERENCES November 26 2013 22 T ACCINI N PARADISO R LORIGA G Wearable health care system for vital signs monitoring Mediterraneam Conference on Medical and Biological Engi neering 2004 9 23 M ANU MyrRy LASSE HAHTO HANNA KARHU MIKKO MALMI VAARA JUKKA VANHALA PEKKA ISO KETOLA TAPIO KARINSALO A mobile device as user interface for wearable applications The 3rd International Conference on Pervasive Computing 2005 19 24 D HARMA P AGRWAL Roy L ASHOK Next generation wearable networks Computung practices 2003 7 25 B ENJAMIN ANTHONY ADAM SANTANIELLO PETER BEAULIEU COREY LEVEILLE SAFE T Sensory Automated Fire Emergency Tool SAFE T URL http www ecs umass edu ece sdp sdp 12 zink presentations FPR 1 pdf Accessed April 11 2012 16 26 T S TARNER The challenges of wearable computing Part I amp part 2 ieee micro 2001 6 27 K ING TONG LAU RHYS WAITE DERMOT DIAMOND TANJA
35. g The MIThril LiveNet system was developed at MIT for monitoring the health of soldiers This wearable system includes embedded accelerometer and temperature sensors to detect shivering and avoid hypothermia in soldiers 21 Wearable and Mobile Computing Support for Field Service Engineers EL007A Anil Puchchkayala 2 Introduction to Wearable Computing November 26 2013 10 Wearable and Mobile Computing Support for Field Service Engineers EL007A Anil Puchchkayala 3 Methodology November 26 2013 METHODOLOGY 3 1 Analysis of the problem domain The main research of this thesis work is focused on a monitoring system to support field service engineers at workplaces The field service engineers usually face a wide range of hazards in industrial working environments Now a days in workplaces ser vices engineers are using different kind of equipments like safety gloves hearing pro tection headsets and helmets these equipments are not enough to self rescue the ser vice engineer The environment in which the service work is carried out varies from safe zone to hazardous The service engineer working on site may get unknowingly affected by a gas leakages or hazardous environmental conditions Due to this reason they require special wearable equipment that can alert them in such situations To solve this problem we proposed a wearable automated safety suit that can monitor the service engineers environmental and healt
36. h conditions at workplaces A wearable automated safety suit reduces the injuries and provides better protection from the ac cidents and enables data collection that can be used to analyze and prevent future accidents 3 2 Wearable system Designing criteria Before starting the design of the automated safety suit it is important to know the problems arise at the workplaces In an investigation The ABB company found the possible problems that arise in the workplaces These investigations were done by the company people in industries They identified several issues by conducting the inter views with service engineers They made some use cases showing the problems that service engineers will meet in the workplaces gas leakages unexpected environmen tal conditions technical failures health problems It is required that the automated safety suit can solve these problems The proposed automated safety suit can solve the above problems with 1 Monitoring the gas leakage at the workplaces 2 Monitoring the service engineers environmental conditions and his own health conditions 3 It provides the feedback alerts to the service engineer in case of emergency situation 11 Wearable and Mobile Computing Support for Field Service Engineers EL007A Anil Puchchkayala 3 Methodology November 26 2013 4 If service engineer is not responding to the alerts the mobile application will send the alerts to the supervisor In this
37. ies as the Bluetooth but at present it supporting only few mobile devices where as Bluetooth can support for all the mobiles By comparing all the above protocols Bluetooth has the less power consumption high datarate transfer than Zigbee and 25 Wearable and Mobile Computing Support for Field Service Engineers EL007A Anil Puchchkayala 5 Results November 26 2013 WearableAdvancedSafetySuit Humidity Heart rate Env Temperature Skin Temperature Status connected Figure 5 1 Left picture shows the advanced safety suit and right picture shows the Android application Temperature Status Env Temperature Is Too High 33 97 High Environment temperature has been J detected 33 97 Updates available 17 updates found Are you ok USB debugging connected lll Select to disable USB debugging Connected as a media device Touch for other US ns Figure 5 2 Left picture shows the alert temperature notification and right picture shows the temperature alert message 26 Wearable and Mobile Computing Support for Field Service Engineers EL007A 5 Results November 26 2013 Anil Puchchkayala ANT Property Bluetooth ZigBee ANT Frequency 2 4GHz 2 4GHz 2 4GHz Range 100m 100 300m 10m Datarate 1 3 Mbit s 100 250kbps 20kbps Peak current Consumption 30 mA 30 40mA 17mA Latency 100ms 20ms Zero Support for mobile device Yes Yes Only few mobiles have support
38. ital signs such as heartbeat skin temperature and outer en vironmental temperature and CO gas from the external safety suit The author selected Android operating system for development of user interface which is open source and supports multi tasking as well as background services WASS is able to process the incoming sensor data and display it on the user interface lt lt Java Class gt gt aAlertPreferences lt lt Java Class gt gt lt lt Java Class gt gt AbbWearable Loginacess abb wesrable sensors se 4 Username String 4 password String Fi Loginacess onCreate Bundle void ArduinoReceiver onReceive Context m updateaction void abb wearable sensors se Sof DEVICE ADDRESS String flo ArrayList lt Float gt 4 values ArrayList lt Float gt 4 time ArrayList lt Integer gt 4 time1 ArrayList lt Integer gt username String percentage String Fo 3 AlertPreferences lt lt Java Class gt gt onCreate Bundle void GraphView ENA yTitle String chartTitle String lt lt Java Class gt gt MyLocation lt lt Java Class gt gt abb wesrable sensors se coms gt QO amp locationResutt 0 1 lt lt Java Class gt gt LocationResutt S LocationResutt gotLocation Location void A GetLastLocation run void Figure 4 4 WASS application class diagram 21 Wearable and Mobile Computing
39. lse rate is defined by arterial blood oxygenate measuring light absorption by blood 7 A pulse sensor which is an open source heart rate sensor is used for calculating heart rate of the service engineers in beats per minute The pulse sensor is attached to the service engineer s ear lobe and the other end is connected to the microcontroller The microcontroller transmits the heart rate to the mobile phone by using bluetooth interface 25 Body temperature A sudden change of the body temperature indicates infection 7 and stress Hu man body temperature is rather different especially within the outer and inner parts of the body A general body temperature is measured in the anus which is about 37 1 C Temperatures are almost invariable for a healthy person and it varies depends upon the age and deviate about 0 4C to the general body temperature It serves as an indicator 16 Wearable and Mobile Computing Support for Field Service Engineers EL007A Anil Puchchkayala 4 Design and Implementation November 26 2013 of the impeding infections and general stability of the persons Body temperature is measured by using the electrical and optical devices In this thesis TMP36 tempera ture sensor 6 is used which is very small and easy to integrate in the clothes The temperature sensor is located on the chest and it is interfaced to the microcontroller Carbon monoxide Carbon monoxide CO is one of the primary toxic gases in in
40. n different kind of environments and some work orders requires special training and equipment In an in dustrial working environment service engineers may face several safety issues Here the usage of a wearable sensing and computing equipment can improve the safety standards The proposed automated safety suit helps reducing safety related risks by sensing users and environmental conditions Therefore the automated safety suit ensures the safety of the field service engineers at work places This safety suit provides physical alerts in their work area and mobile alerts to the service engineer supervisor of the work field or control center whenever the sensors detect abnormal conditions 1 2 Overall aim The main objective of this thesis is to develop a new generation of advanced protective clothing for the field service engineer that leads to a significant increase in field service engineer s safety without reducing work performance 1 3 Scope The scope of this thesis specially targets to monitor and act upon changed users and environmental related conditions for the field service engineer out in the field 1 4 Concrete and verifiable goals Low level Prob lem statement In confined spaces of today the safety measures are monitored manually which can be very risky to the field service engineers lives While doing the work in confined spaces a person is set at the door to control the emergency situation usually based on a paper bas
41. n order to reduce the power consumption comes under the low power design which mixes analogue and digital data processing units In order to save power during inactivity some parts of the hardware are turned off or switched to a low power state 2 1 1 2 Network architecture A well developed network infrastructure based upon open communication standards is to be implemented on wearable systems There are two different types of com munication which are off body and on body communication Wireless technologies are used for off body communication referred to as Wireless Local Area Networks WLANs In relation to on body communication there are a couple of strategies that have been adapted Wired and wireless communication such as Body Area Network BAN or Personal Area Network PAN Considering the better power management and higher bandwidth to power ratio the wired solution is preferable than the wire less BANs PANs for the human body in reference to the placement of sensors IEEE 802 12 1 Bluetooth IEEE 802 15 4 Zigbee IEEE 802 15 3 are some of the exam ples of wireless BANs PANSs Ethernet USB Firewire etc are some of the examples of wired BANs PANSs 24 2 1 1 3 Transducers The functionality of a wearable computing solution can be enriched utilizing trans ducers That way monitoring functionality and context awareness can be realized in wearable computing Primary importance is given in this area for the development of future
42. neers EL007A Anil Puchchkayala 3 Methodology November 26 2013 3 3 1 Wearable automated safety suit algorithm The figure 3 2 shows the wearable system signal processing algorithm and data flow The automated safety suit collects the data from various sensors and it will send to the mobile application using a Bluetooth device The mobile application takes the input sensor data from the safety suit and it will make the decision according to the sensor thresholds In case of any emergency situation the mobile application will give the alerts to the user by means of audio and vibration alerts If the user is not responding to these alerts the application will send the notifications to the supervisor with user location coordinates so that user can get the help from the supervisor E START Safety Suit Mobile Application No Any obnormal conditions Data processing is done inside the mobile application No Is User responded Figure 3 2 Wearable automated safety suit algorithm and data flow 14 Wearable and Mobile Computing Support for Field Service Engineers EL007A Anil Puchchkayala 4 Design and Implementation November 26 2013 DESIGN AND IMPLEMENTATION The automated safety suit was designed and the usability tests are performed at ABB Corporate Research Center Prototype implementations are explained further in sec tion 4 1 The prototype is based
43. nication is opted one is that the energy consumption of a system is low in wired since it is communicating end to end whereas in wireless each and every node has to transmit and receive data that involves consumption of more power This inturn lead to bigger size of a sytem with Bluetooth and Zigbee devices where it is not acceptable for BAN and more over re placement of battery becomes complex There is more possibility for optimizing the sensor network usage given single layer hop toplogy with no interference under wired but in wireless it is quite opposite that is multi layer hop topology that results with more intereference 5 4 Automated safety suit power analysis 5 4 1 Theoretical power analysis The automated safety suit is powered by 1 2 v AAA rechargeable nickelmetal hydride battery The below table shows the power consumptions of the each and every compo nent in the wearable automated safety suit The automated safety suit consumes 244 2 mA power which gives the theoretically four hours usage of with 1000mAh nickel metal hydride battery and also we performed a practical test by wearing the safety suit The practical test performed with four different rechargeable batteries the test results are shown in the result chapter The safety suit works up to four hours after that the mobile application will show the notifications to the user so that the service engineers can be able to replace the battery Part Avg Powe
44. of the seven ABB research centers world wide with 300 employees supporting the operating companies by furnishing them with fundamental research new technologies and innovative solutions for future prod uct generations This thesis work was conducted at ABB Corporate research in Vasteras in Software Architecture and Usability SARU group Wearable and Mobile Computing Support for Field Service Engineers EL007A Anil Puchchkayala 2 Introduction to Wearable Computing November 26 2013 INTRODUCTION TO WEARABLE COMPUTING 2 1 Wearable technology Wearable technology is defined as the intersection of the fields ubiquitous computing and functional clothing design 11 However the functional design process has to be made reliably into the design of wearable technology Designers of wearable technol ogy could easily understand the ways of human interaction with computing devices rather than human interaction with clothing Consideration of both is essential for the successful design as they are highly dynamic and culturally influenced Introduction of wearable technology to field service engineers where they are exposed to dangers or hazards could save their lives Therefore in that case a reliable wearable system has to be implemented 2 1 1 Wearable system A set of heterogeneous modules is included in a wearable system wherein the most basic configuration consists of one input module one main module and an output module as sh
45. on wearable amp mobile technologies and active clothing system The prototype contains two major parts which are automated safety suit de sign and mobile application design These parts are explained in the following sec tions 4 1 Safety suit The automated safety suit contains different sensors for monitoring user s and en vironmental conditions This suit is equipped with actuators such as speaker and vibrator to provide notifications when undesirable or dangerous sensor thresholds are exceeded In this prototype E textile technology is used for integrating the sensor and microcontroller inside the safety suit E textile is an electronic textile that has the electronics and interconnections It is used for both complex and protective sensing The Arduino LilyPad microcontroller is used for collecting the data from the sen sors Arduino LilyPad is an open source hardware toolkit and is specially designed for wearables and E textiles Inside the safety suit all these sensors are connected by using silver plated nylon 234 34 4ply thread This is conductive material and it has low resistance for every 30 centimeters of the thread and the resistance loss is 14 ohms 5 This thread carries the current and power signals The firefly Bluetooth device is used for communication between the LilyPad microcontroller and mobile phone The Bluetooth device sends the sensor data from the suit to mobile phone 4 1 1 Sensors Sensors are playing critical
46. or Field Service Engineers EL007A Anil Puchchkayala 6 Discussion November 26 2013 32 Wearable and Mobile Computing Support for Field Service Engineers EL007A Anil Puchchkayala 7 Conclusions and Futurework November 26 2013 CONCLUSIONS AND FUTUREWORK In this thesis work a complete prototype of a wearable system was demonstrated and developed for monitoring and controlling field service engineers health The proposed system is a low cost automated safety suit which is able to monitor the user conditions and send alerts to the supervisor of the work field as well as to the backend command central via e mail SMS and phone call The advanced safety suit was implemented and tested to provide all the measured sensor data This data is tracked with a help of a wireless system to avoid the risk of human lives in confined spaces In the present automated safety suit sensors which are connected to the micro controller through conductive thread has high resistance To overcome this problem in future an approach can be tried i e by twinning the two threads the resistance can be decreased so that the sensors could be more easily distributed throughout the safety suit The sensors such as body temperature sensor can be placed foldable at neck or integrated with heart beat sensor is one example of the above discussed approach This automated safety suit has only four hours battery life and in future the bat tery life can be
47. own in Figure 2 1 Input Module Main Module Output Module Camera Processor Display Mouse Memory Speaker Keyboard Firmware Vibrator tactile Microphone Earphone Figure 2 1 Basic wearable system In a wearable system input module is basically a transducer that translates ther mal mechanical electrical chemical or radiant signal into an electrical signal These transducers are also called as sensors Some examples of input modules are camera microphone mouse and radio frequency RF transceiver In order to monitor the system a transducer also comes under the output module whereas transducers in the output module acts in a quite opposite direction in which an electrical signal is trans formed into a mechanical thermal magnetic and chemical or radiant signal Some of the examples of monitor modules are earphone display vibrating tactile and RF mo Wearable and Mobile Computing Support for Field Service Engineers EL007A Anil Puchchkayala 2 Introduction to Wearable Computing November 26 2013 dem A data processing module contains the processing power digital signal proces sor general purpose processor and configurable hardware storage memory volatile and nonvolatile and on board software operating system application software and drivers A fusion of different technological areas is made when designing a complex system such as wearable system in the garment In order to
48. prototype the author used a high visibility vest based clothing system for designing the automated safety suit It contains a body temperature sensor pulse sensor environmental temperature amp humidity sensor and a CO gas sensor The body temperature sensor measures body temperature of the field service engineer s pulse sensor measures the heartbeat of the field service engineer s a CO gas sensor measures the CO gas and air temperature and humidity sensor measures the humidity and air temperature levels in working environments The safety suit also contains a vibration motor and speaker The speaker and vibration motor are used for giving the notifications when the dangerous sensor thresholds are exceeded There is a need for data exchange between the safety suit and the mobile device It can be achieved by using different kind of wireless technologies such as Bluetooth Zigbee Wlan In this prototype Bluetooth technology is used for communication between the safety suit and the mobile device It is preferred because it provides high data rates and robust communication for short range distances The important part of the system design is to make sure that the device and sensors are invisible to the user and stored inside the service engineers suit 3 3 System architecture The advanced safety suit as depicted in Figure 3 1 consists of five major components namely the safety suit SU the mobile device MD the command central CS the
49. r mW Peak Power mW Bluetooth Modem 0 025 153 Body Temperature Sensor 0 825 0 825 Environment Temperature and Humidity Sensor 0 00003 1 8 CO Gas Sensor 38 120 Vibrator 0 63 Speaker 0 98 Table 5 3 Theoretical power analysis 5 4 1 1 Practical test results In the below table shows the power consumption of the wearable safety suit The power test was performed with four different rechargeable batteries Table 5 4 shows battery life during practical tests and expected values There has been voltage drop as 28 Wearable and Mobile Computing Support for Field Service Engineers EL007A Anil Puchchkayala 5 Results November 26 2013 we observe in the table The reason behind is that the safety suit was designed with the silver conductive thread where it has the internal resistance of 30 ohms for every 30cm of the conductive thread It is used for carrying current for power and signals that connects electronics on to clothing The conductive thread length varies with placement of sensor and actuator This might be the primary reason for the voltage drop of a battery as conductive thread was connected to different sensors and actuators across the whole wearable safety suit Battery Battery Life Practical result Battery Life Expected result Test I 3h40 min 4 hours Test 2 3h35 min 4 hours Test3 3h48 min 4 hours Test4 3 h48 min 4 hours Table 5 4 Practical test results
50. rable Computers 1998 8 LINDEN BALL JERRY BUSBY NIGEL DAVIES CHRISTOS EFSTRATIOU JOE FINNEY MARIAN ISZATT WHITE KATHARINA KINDER GERD KORTUEM DAVID ALFORD Sensor networks or smarat artifacts an exploration of orga nization issues of an industrial ealth and safety monitoring system UbiComp 2007 1 JAANA HANNIKAINEN Electronic Intelligence Development Lomonosov s for wearable Applications PhD thesis Tampere University of Technology Institute of Electronics 2006 1 M BAUER J SIEGEL A field usability evaluation of a wearable system First IEEE International Symposium on Wearable Computers ISWC 97 Cam bridge MA USA 1997 9 P C PENDHARKAR J YORK Humancomputer interaction issues in mobile computing in a variable work context Int J Human Computer Studies 60 2004 1 HONKALA M PELTONEN P MATTILA H CLUITMANS L MATTILA J VAATANEN A COMERT A HYTTINEN J HANNIKAINEN J TIERANTA T VANHALA J PITPPONEN K SEPPONEN R KARKI S LEKKALA J Smart clothing for firefighters International Scientific Conference of Intelligent Ambi ence and Well Being Ambience 05 pp 221 229 Tampere Finland 2005 9 BONIFAZ KAUFMANN Design and Implementation of a Toolkit for the Rapid Prototyping of Mobile Ubiquitous Computing Master s thesis University of Klagenfurt Austria 2010 19 M B MOHD KHADRI Gas Mixure Toxic gas sensors by using sensor array Master s thesis University Teknikal Malaysia M
51. rch for Bluetooth device It will display the safety suit Bluetooth device name and pair with that device This step is required only for first time installation 3 After wearing the safety suit open the WASS android application in mobile It will show the login screen then enter the user credentials 4 It will go to the next screen in android application in this screen go to the op tional menu and select the settings button it will display the settings page then enter the mobile number E mail address and sensor thresholds etc according to the user requirement 39 Wearable and Mobile Computing Support for Field Service Engineers EL007A Anil Puchchkayala A Appendix1 User Manual November 26 2013 5 Then come back to the main screen the applications automatically connect to the safety suit using a Bluetooth connection 6 On the main screen it will show the sensor data so that user can be able to see the environmental and health conditions 7 If any abnormal conditions arise the application will show the alert dialog and notifications to the user mobile and in turn mobile gives also the vibration alert and sound alert At the same time safety suit also provides vital signs with the help of a vibrator and speaker 8 If the user is not responding these messages the application will send automatic SMS to the particular person and also it will make a phone call as well 9 The mobile application will update the sensor data
52. rment or wearable device When designing a wearable device several is sues are to be considered Mobility Design of the wearable device should not interfere with natural movements and also should take into account situation specific movements Weight of the wear able system should not interfere with stationary or dynamic balance when in more extreme conditions Placing a weight close to the bodys center of gravity generally reduces the perception of weight 12 Flexibility There are two types of PCBs available to integrate into clothing or body flexible and standard solid PCBs Flexible PCBs come with optimal bend radii of 1 2 millimeter where as standard solid PCBs are often difficult to integrate The problem with the flexible PCB is that it depends on the layout of the components it is populated with and will weaken electrical connection 2 1 1 6 User interface The user interface enables the interaction between the user and the system and it is used to represent the information which is very easy to understand the results In this thesis work to develop user interfaces in wearable technology the Android platform is used for displaying the data from various sensors 2 2 Wearable applications The sensors are integrated with clothing or personal objects to improve the capabil ities proactively to develop systems from hazardous environments by using wearable computing Wearable applications supervise the people in their daily life or by
53. roid activity contains the optional menu and it is having four submenus such as settings export local graph and exit From the setting button the user is able to adjust the emergency contact change the e mail address and set various sensor thresholds according to the user preferences which are shown in the Figure 4 7 After setting the thresholds in the settings screen the application automatically 22 Wearable and Mobile Computing Support for Field Service Engineers EL007A Anil Puchchkayala 4 Design and Implementation November 26 2013 gt Connecting to 00 06 66 08 5F 6F lig WearableAdvancedSafetySuit Humidity Heart rate C tn Env Temperature Skin Temperature pe C es E Ass ps By m Login successful Status not connected Figure 4 6 Android main screen lig Alert Preferences Contact and Timeout Preferances Emergency Contact Number Type the telephone number of the emergency contact Email Address Type the Email Address Timeout in Seconds choose How Long the Alert Goes Before Help is Contacted Alert Actions Vibrate Figure 4 7 WASS application settings screen 23 Wearable and Mobile Computing Support for Field Service Engineers EL007A Anil Puchchkayala 4 Design and Implementation November 26 2013 comes back to the main screen In the main screen user can able to see the real time data coming from the safety suit via Bluetooth The second tab export
54. umidity body temperature and heartbeat A mobile application is proposed to monitor and control the automated safety suit which also identifies the environmental changes and provide prompt alerts to the user Keeping the usage of automated safety suit in mind the sys tem is designed in a user friendly manner and all the key elements are considered and implemented accordingly for the requirements of service engineers who are working in confined spaces and hazardous places Keywords automated safety suit wearable technologies mobile computing human safety confined areas Wearable and Mobile Computing Support for Field Service Engineers EL007A ES Anil Puchchkayala ovember 20 ACKNOWLEDGEMENTS This thesis work is the result of 20 weeks of Research and Development project that has been carried out at the department of the Automation Technologies in the Software Architecture and Usability group SARU ABB Corporate Research in Vasteras Sweden It is working with the cooperation with school in Electronics Design Mid Sweden University MIUN First of all I would like to thank Marko Lehtola my supervisor at ABB Corpo rate Research in providing his excellent guidance and support during the master thesis work and also I would like to Dr Markus Aleksy team leader for guiding my master thesis work Special Thanks to Dr Magnus Larsson my manager and SARU team for warm welcome environment and providing the many technical helps
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