ENGR 1181
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1. delay e Urban delay Points Subtotal 20 At departure sensor Yes No Points Earned 0 4 Comments Train speed increases LEDs turn off Gate opens Runs repeatedly indefinitely without any new errors Points Subtotal 16 Total Points Earned General Comments 36 Instructor TA s Signature Date 26 ENGR 1181 Lab 8 Train Project Project Notebook Guidelines Lab Participation Agreement Team Name Date Lab Title Instructor We as a team agree to have actively contributed towards the lab deliverables We have used only approved materials and processes as documented in our course material Furthermore each team member has egually contributed to the analysis and documentation involved Team Member Printed name Duties performed during lab brief Signature Duties performed outside class brief 27 ENGR 1181 Lab 8 Train Project Project Notebook Guidelines Train Project Grading Guidelines Project Notebook A Point Points Section Breakdown Earned Cover Page 5 Table of Contents 5 List of Figures and Tables 5 Project Notebook Body 110 Executive Summary Follow the guidelines for executive summaries provided in 25 the Technical Communications Guide to give a summary of the train project lab Introduction Clearly define the purpose of2. where X is 14 and then 15 The command must be issued twice once for each pin assignment 3 Now that the LEDs are attached their status can be changed through the Arduino To change the status of the digital pin enter the command a digitalWrite 15 1 One of the LEDs should now be on Which LED is on Write your answer in the worksheet 4 The LED changes with a logical value of O or 1 Logical O turns the LED off and logical 1 turns the LED on Using the command line turn on both LEDs 5 When using the digitalWrite command it is advisable to assign the pin value to a variable to keep track of which pins are assigned to the left and right LEDs To do this assign the variable rLED 14 and use rLED in the digitalWrite command in place of 14 The new command will look like this a digitalWrite rLED 1 The same process can be used for the left LED 17 ENGR 1181 Lab 8 Train Project Lab Procedure 8A Task 4 Making the Train Move 1 Place the train on the track at the location where the black piece of track has wires connected to it from the Arduino Ensure that all wheels are properly on the track check with your Instructional Staff if necessary 2 The train has three states of motion forward backward and release Release is a command that can be used to stop the train To enable the train to move forward type the command a motorRun 1 forward The train won t move until you issue the motorSpeed command in the next ste
3. must also have a crossing gate that lowers before a train arrives to prevent cars from driving onto the tracks For further safety the train will be signaled to slow down when approaching the crossing Once the train has fully cleared the crossing it may resume a higher velocity This entire process will be computer programmed for repeated use Figure 1 N Scale Model Train Set In rural small town communities the roadway traffic will be moving at faster speeds This is due to open terrain and being less densely populated In the urban dense city settings the roadway traffic will be moving more slowly due to increased traffic flow pedestrians and safety for increased population density Your program must be developed such that it can easily be adjusted in the future based on various clients needs Cities in rural settings will require more warning time between the flashing lights and the gate moving down as the cars will be moving faster i e 45 55 mph Faster traveling traffic needs more time to stop and distance on roadway prior to the gate coming down Likewise cities in the urban setting 25 35 mph reguire less warning time between the lights flashing 4 ENGR 1181 Lab 8 Train Project Project Description and the gate moving down However one must also be aware of excessive time for cars to be stopped as traffic will back up unnecessarily if the warning lights and gate movement occur too soon Balancing these timing consi
4. stand on lab chairs Don t sit or stand on lab tables e Remove dangling jewelry e Pull back long hair e Refrain from wearing loose clothes e Recall location of first aid kit Report ALL injuries e Problem Statement Students are challenged to develop a MATLAB program that satisfies the client s specific reguirements for a train operating system The MATLAB program is tested in lab using control of a miniature train set see Figure 1 via interaction with an Arduino microcontroller Additionally a simulator program has been created that allows students to run the MATLAB program from any computer and simulate how the train system would perform ENGR 1181 Lab 8 Train Project Project Description Introduction and Background Your team is a group of computer and mechanical engineers working for a software engineering firm Your company has reguested that you develop a software package that will control an automated railroad transportation system This software will be sold to different cities with different traffic regulations such as urban and rural communities so the program must be robust to easily be adjusted to different situations The software should control e Train movement speed variation or stoppage at stations e Road railroad crossing gate e All railroad signals and lightings A safe train crossing must have flashing warning lights and optional sounds that signal drivers and pedestrians when a train is approaching It
5. value into the worksheet This is the value of the unobstructed sensor Repeat the command at least 5 times Enter 2 more values into the worksheet 5 Have a group member block the approach beam with his or her fingers While blocked a green LED on the sensor circuit board will light up verify this 6 Once again type a analogRead approach several times Enter that value into the worksheet This is the value of the obstructed sensor Enter 2 more values into the worksheet and answer the following questions Does there appear to be a pattern to the values How do these values differ from the unobstructed values Are the values always consistent Why might this be important when it comes to writing a program 18 ENGR 1181 Lab 8 Train Project Lab Procedure 8A 7 Very Important When using the analogRead command within a script file you must call analogRead multiple times before testing the returned value For example a analogRead approach a analogRead approach if a analogRead approach gt 250 The reason for this is that the sensors must be activated a few times before they can reliably take a reading This means that you must take multiple dummy reads before taking a reading to be evaluated This must be done every time that you make a sensor reading Task 6 Writing a Control Program w In order to effectively control the train for an infinite period of time an m file should be used Open a
6. N THE OHIO STATE UNIVERSITY cans COLLEGE OF ENGINEERING ENGR 1181 Lab 8 Train Project Project Description Lab Procedure 8A Lab Procedure 8B 8C Notebook Guidelines ENGR 1181 Lab 8 Train Project Project Description Project Description ENGR 1181 Lab 8 Train Project Project Description e Overview of the Train project Lab 8 The Train Project Problem Solving Lab challenges students to apply problem solving strategies in a team setting to solve a real world programming scenario Students will review this document and then take the Carmen guiz before arriving to the lab Learning Objectives students will be able to 1 Become familiarized with the Arduino microcontroller 2 Learntouse sensor feedback data within MATLAB 3 Work as a team under a deadline e General Information 8 Safety Policies During the laboratory sessions student teams will develop a MATLAB program given certain requirements Students will be graded on the quality of work and meeting the deadlines Situations involving late reports will be handled at the discretion of the instructional staff Please note that all parts and tools assigned to a team must be returned and formally accounted for at the end of the project Failure to return any item will result in a grade of incomplete for the entire team until the item is found or replaced Lab safety rules are as follows e No open toed shoes Do not touch the electrified track Don t
7. at the returned time will always contain a long trail of decimals and will never be equal to an exact time value such as 2 seconds This is because MATLAB does not increment time in a predictable manner like a stopwatch delete instrfindall This command can be used to clear out any COM port assignments in MATLAB Teams should have this command at the top of any script file before attaching the Arduino It can be useful if errors are encountered when attaching the Arduino Note The pause function is not allowed for this project This is a MATLAB function that halts a program for a specified amount of time This program requires constant data monitoring therefor any pause should NOT be used in this application or any application that requires data monitoring This is a safety concern if your train is operating and stops monitoring as valuable seconds lost in the information loop can cost a human life 11 ENGR 1181 Lab 8 Train Project Project Description e Usingthe Train Set Simulator Students may work on the train project from home or in a computer lab by setting up the train set simulator in conjunction with MATLAB The simulator emulates the physical train set in a small window on the desktop Code that is working on the simulator will also work on the lab train set and vice versa with a minor change to the code The simulator depicts the train movement and location the train speed the break beam sensors the crossing gate the f
8. be completed before beginning Task 1 of the lab procedure 9 10 Task 1 10 Plug the Power Supply into the outlet power strip Ensure that the power strip is turned on Ensure the black power cord is plugged into the red and black power cable coming out of the side of the train set Note Do not plug this directly into the Arduino Plug the Arduino USB cord into the computer Download the zip file for the MATLAB train simulator from Lab 8A on the EEIC website and save it to your desktop Right click the zip file and select extract all A new folder named MATLAB Train Simulator will be created This folder will be your workspace for this project Ensure that the red LEDs on the Break beam sensors are on Ensure that the yellow LEDs on the Arduino are on as well This means that these devices have power Open MATLAB Open the Train Project Lab Worksheet in Excel Connecting to the Arduino Open the Windows Device Manager To open the Windows Device Manager click on the start menu then in the search box type device manager and press the enter key You will receive an error message click OK Once the Device Manager has opened click on the arrow next to Ports COM amp LPT Once the Arduino has finished installing look for Arduino UNO COM in the list Your number COM will be shown here Write this number in the Train Project Lab Worksheet under Task 1 In MATLAB find the change folder icon which is locate
9. ct Project Description e Arduino MATLAB commands Below are descriptions of each of the Arduino commands necessary for this project These are MATLAB commands that are used to control the Arduino and ultimately the train set Keep in mind that this page does not include proper syntax The use and syntax of these commands will be explained in Lab 8A a arduino COM This command will connect the Arduino to MATLAB The COM port number may change based on a team s work station instructions in Lab 8A will explain how to find the COM port number Teams will replace the with a digit such as 3 The port will never be 1 port 1 is a physical port on the computer servoAttach This command is needed only once per session if entered via command window or once per m file if writing a program The command will establish a connection to the servo motor that controls the crossing gate servoWrite This command is used to move the crossing gate The usable range of this command is between 10 and 170 values outside of this range can damage the servo motor motorRun This command is used to control the direction of the train s velocity The direction can be forward backward or the train can be stopped It can be used repeatedly however the train s direction does not need to be changed during this scenario motorSpeed This command is used to control the speed of the train The usable values allowed are 0 stopped and between 170 a
10. d toward the left side of the screen just above the words Current Folder Click change folder and find the MATLAB Train Simulator folder Select it and click change folder This tells MATLAB to work out of the train simulator folder In MATLAB s command window clear all variables and clear the command window using clear all close all and clc Enter the command delete instrfindall This will clear any previous arduino connections In the MATLAB command window type a arduino COM where is the COM port number found earlier For example if your Arduino is in COM3 type a arduino COM3 Do NOT type the arduino command without assigning it to the variable a using the equals sign If you do use the clear commands issued above in Steps 4 and 5 Do not copy and paste the command type it in manually MATLAB does not correctly interpret all Word formatting MATLAB will attempt a connection with the Arduino If an error message pops up double check that you have followed the above steps exactly as listed repeating steps as necessary If you try again and get the same message ask a member of the instructional staff for assistance 16 ENGR 1181 Lab 8 Train Project Lab Procedure 8A 11 Examine the command window output Notice how Servos are Detached and Digital Pins are Unassigned If you do not see the output repeat the command without suppressing the output with a semi colon 12 Ifthe connection i
11. derations is important The test track shown in Figure 1 will be used to simulate a train running in a real world environment After completing the code you will write documentation that can explain your program to a developer as well as a customer Your company also must be clear on any issues and problems resolved throughout development as well as recommendations for future trials and program improvements Your task will be completed using the MATLAB coding software You will write a program that will fully automate the crossing gate seguence and control the train s velocity This will be accomplished by monitoring via two break beam sensors to determine the train s location The train motor speed the crossing gate and the warning lights can then be adjusted accordingly These changes are made by sending commands to the Arduino microcontroller which can be controlled through your MATLAB program e Description of Components Train Tracks The track and train are a standard n scale model train set shown in Figure 2 N scale is 1 160 of the real train s size This scale is widely used as it allows for complex railroad designs in a small space The track provided has a width of 9mm between rails which are made of metal for conductivity Powering the train can be accomplished by running a current along the track The Arduino is connected to the track and can provide roughly 11 2 volts to power the train s DC motor The speed of the train will
12. e it into its box 4 Remove the USB cable from the computer Task 9 Check Out After you have finished the lab and the clean up procedure have your instructor or GTA sign the End of Lab Signoff line at the end of the rubric You will lose 5 points if this is not signed by your Instructor TA 20 ENGR 1181 Lab 8 Train Project Lab Procedure 8A Week 2 Lab Procedure 8B 21 ENGR 1181 Lab 8 Train Project Project Notebook Guidelines Lab 8B Lab 8C In labs 8B and 8C teams will code a solution to the problem statement given below You are a team of engineers that is tasked with automating a railroad system The train will have two general routines the approach routine into the city urban or rural town options and the departure routine into the rolling countryside which may be the same for both urban and rural options The departure side of the track is the side without the gate lights and the approach side is the side with the gate and lights Upon user input the program will set the urban or rural scenario Using the sensors the program will determine the train s location When the train passes through the approach sensor the train must slow down for safety concerns as it approaches the town whether it s an urban or rural town Next the LEDs on the crossing gate will begin to flash in an alternating on off pattern to warn drivers and pedestrians After a short delay the gate must go down You will determin
13. e the length of this delay for the gate keeping in mind that the length must be make sense for the traffic speed limit at the crossing road Once the train crosses through the departure sensor the gate must go up the flashing lights must turn off and the train must resume its normal speed maximum recommended speed for efficiency of travel Note It is okay to time the lights off prior to the train leaving town and gate moving up as long as it has at least passed the station The final program will consist of many layers to account for the changing velocities and controlling the gates and lights at different times To simplify the approach flags can be used to essentially break the track into two halves one for rural and one for urban The rural road is less densely populated and has less crossing so the train can run faster motorspeed of 255 while the urban road has a higher population more stops and lower train speeds motorspeed of 170 Consider the speed of both the train and traffic in these settings and how this will affect the delay of the gate and the speed of the train while it passes over the road The program will be written in such a way that the initial position of the train is irrelevant and should work properly after the train passes the very first sensor Also the program must be written in such a way that if the wrong sensor is broken the program will not fail For example breaking the approach sensor t
14. ide of lab Teams should begin compiling the information needed for the Project Documentation Package Due at the beginning of lab 8B 1 Carmen Quiz Individual assignment 2 Pseudocode Team assignment Lab 8B Breakdown In Lab Introduction Problem Solving Session e Lab clean up 13 ENGR 1181 Lab 8 Train Project Project Description Lab 8C Students have 40 minutes to finalize the train project problem solving code assignment This time may also be used to work on the extra credit assignments see EEIC website for details Each team is expected to have a working code by the end of the 40 minutes It is highly recommended that each team have a complete code that works on the train simulator before coming to this lab After the 40 minute problem solving session the instructional staff will test each group s program individually After this each team must complete the Project Documentation Notebook to be turned in by the last day of the university s scheduled classes before the reading day Lab 8C Breakdown e In Lab Introduction e Problem Solving Session Testing Session e Lab clean up Due at the end of lab C 1 Teams must have their Final Testing Checklist evaluated by a TA before the end of lab 8C 14 ENGR 1181 Lab 8 Train Project Lab Procedure 8A Week 1 Lab Procedure 8A 15 ENGR 1181 Lab 8 Train Project Lab Procedure 8A Lab 8A Prepar ing the Lab Station The following tasks must
15. lashing crossing lights and it differentiates between the approach and departure sides of the track The train set simulator ZIP file can be downloaded from the EEIC course website under Lab 8A Lab 8B or Lab 8C After downloading the ZIP file open up the file named Train Simulator Student User Manual docx This word document will provide further instructions on how to setup the simulator Figure 7 shows a train simulator in action It is highly reccomended that every student learns how to use the simulator a AN Ss AB Figure 7 Train Simulator 12 ENGR 1181 Lab 8 Train Project Project Description e Project Timeline Lab 8A The goals of Lab 8A are to become familiar with the Arduino MATLAB interface as well as the necessary commands used when programming your train It is recommended to use the TeamViewer software so that both sides of your work station can view and or participate in the programming aspect of the lab you can find it in EEIC website Lab 8A Breakdown In lab introduction e Determine which ports do what specific tasks e Complete exercise with commands Learn MATLAB command lines Mini problem solving scenario Pseudocode development e Lab clean up Due at the end of lab 8A Train Project Worksheet for Tasks 1 7 Lab 8B Students begin the train project problem solving lab program Students will start using the Train Simulator as an additional tool to troubleshoot MATLAB code outs
16. nd 255 values outside of this range can damage the motor This command will be used whenever the train s speed needs to be changed pinMode This command is used to set up a connection to the LED crossing lights It must be issued once per individual LED The necessary information to use this command is the digital pin number of each LED digitalWrite This command will be used to change the status of the LEDs either on or off logical 1 or 0 10 ENGR 1181 Lab 8 Train Project Project Description analogRead This command will be used to gather information from the break beam sensors Lab 8A procedure and data will allow users to interpret and apply their use The Arduino must be warmed up before taking a sensor reading and the first few readings taken from the sensor are not reliable For this reason students must call analogRead twice before taking an official sensor reading For example a analogRead approach a analogRead approach if a analogRead approach gt 250 tic This is MATLAB s time function Think of tic as a stopwatch when this command is issued the time starts The stopwatch will continue on forever until tic is used again resetting the time to 0 toc This command is used with tic After tic has been used entering toc will return the amount of time that has passed since tic started in seconds Use the MATLAB help file or an online search engine to learn more about tic and toc Note th
17. new m file in MATLAB Choose a name and save this file into the MATLAB Train Simulator file After putting your group name individual names and class information at the top of the file you should include the following commands clear all close all delete instrfindall clc The next command should be the command learned in Task 1 to connect to the Arduino Next you need to use the commands you have learn in Tasks 2 through 5 to initiate the components you will need to use and create start up conditions Placing all of these commands in to your script file will ensure that MATLAB is fully connected to all of the components ofthe train set each time you run your script file From here you start with an infinite while loop and then write the remainder of the desired program described in task 7 An infinite while loop can be made using the statement while 1 To break this loop use CTL C in command window 19 ENGR 1181 Lab 8 Train Project Lab Procedure 8A Task 7 Writing a Control Program You will spend the remainder of your time in lab writing a program that will find the speed of the train Record this data in the Excel worksheet Reguirements e The train should start on the approach side of the track Calculate the speed from approach sensor to departure Use tic and toc to determine the time from one sensor to the other Run the train at full speed i e a motorSpeed 1 255 Output
18. p 3 Now to set the train speed use the command a motorSpeed 1 X where X is a value from 0 to 255 as described in the next step IMPORTANT For X the train will not run if not given ample power therefore a useable range is about 170 255 If you set the train to move and you hear the motor whirring but there is no movement immediately pull the train off the track set the motorSpeed to 0 and then try again with a larger value 4 Use the command to set the motor speed to 255 The train should now be moving at its max speed To stop the train change the speed command by entering a motorSpeed 1 0 or set the motorRun to release by typing a motorRun 1 release Task 5 Setting up the Break Beam Sensors 1 Unlike the servo and LEDs the break beam sensors do not need initial setup The two sensors will be known as approach and departure Analog port 2 is connected to the approach sensor and analog port 3 is connected to the departure sensor 2 For clarity create the variables approach 2 and departure 3 This helps keep track of the ports 3 When the arduino communicates with the break beam sensors a numerical value is returned to MATLAB By testing the sensor under difference settings the meaning of the value returned to MATLAB can be interpreted 4 To receive the current status of the break beam sensor enter the command a analogRead approach where approach 2 The command window will display a value Enter that
19. s e This is a technical description of your program The intended audience includes those familiar with MATLAB arduino commands and programming in general e Include a list of variable names and uses This should include every variable that is used within your code e Include a list of Arduino commands used with short descriptions e Students are not permitted to copy any project descriptions from this document or any lab procedures 7 Program Description for General Users e This description is for a general audience This audience may not be familiar with programming A reader with no MATLAB or engineering knowledge should be able to understand this description e This section should describe all aspects of the program 8 Brief Discussion e Provide brief explanations of what occurred during the train s run e Describe the progression of the MATLAB code e Describe the obstacles faced and how they were overcome 24 ENGR 1181 Lab 8 Train Project Project Notebook Guidelines 9 10 11 12 13 14 15 16 Conclusion e Develop a conclusion from the results obtained throughout the train project lab including the train and track itself the programming and problem solving method Final Pseudocode e Write out pseudocode to match the team s final program e This may be similar or drastically different from the team s initial pseudocode based on how much the code changes over the course of the project Flo
20. s successful a message will display FE Train Shield Script File detected 11 Clear the command window with clc Task 2 Connecting to the Servo 1 Your servo crossing gate should be in servo port 1 2 To attach the servo and the Arduino the command a servoAttach 1 is used where 1 is the servo number This command must be issued every time the arduino is reconnected 3 When using any Arduino command the letter a with a period will come before the command This is needed since we defined a arduino COM3 For example to attach the servo you must type a servoAttach 1 Type the command in the MATLAB command window now Be sure to use your servo number and proper capitalization where necessary 4 Tocheck your servo type the command a servoStatus Servo 1 should now be attached 5 To control the servo the command a servoWrite X 0 is used X is the servo number 1 and 8 is the angle IMPORTANT For 6 a value between 10 and 170 should be used Using a value outside of this range can damage the servo motor 6 Enter the command a servoWrite X 8 where X is 1 and 9 is 170 The gate should now be closed 7 Now determine at which value 9 the gate is vertical Write your answer in the worksheet Task 3 Setting up the LEDs 1 In order to use the LEDs they must first be assigned to the Arduino The LEDs on the crossing light are attached to digital pins 14 and 15 2 First issue the command a pinMode X output
21. the calculated time and velocity to the Command Window Display the time in seconds for each half loop Display the velocity in miles per hour AND inches per second Repeatable until stopped manually use CTRL C in command window Program MUST contain user written comments Useful Information Use F9 to run only a portion of your code Run Section Use tic toc to determine time The track diameter is 22 5 inches Because the sensor continuously gathers data 120 samples second find a way to obtain only one value and or store one value when the sensors are triggered e Notice that the train has a window the sensor can occasionally see through it Try to avoid an error in your code e The train s speed will slowly increase over time as the motor warms up Once you have the program working enter the values required into the worksheet Save the complete worksheet and the m file created in Task 7 Now that the arduino commands have been introduced begin writing or revising your pseudocode using the necessary commands This code will be turned in at the start of Lab 8B as a team assignment Task 8 Clean Up 1 Enter a motorSpeed 1 0 into the command window to stop the train if it is running 2 Enter the command window and repeatedly press CTRL C until all running MATLAB programs have been stopped This will be indicated by gt gt appearing in the command window 3 Remove the train from the track and plac
22. the train project lab describing the 15 objectives of each of the tasks Program Description Describe the program code in words for developers and 25 general users separately Discussion Provide brief explanations of what occurred during the train s run including worksheet statistics Describe the obstacles faced in writing the final 25 code and how they were overcome Conclusion Develop a conclusion from the results obtained in the train project 20 lab Writing Style 25 Grammar See Technical Communication Guide for guidelines 10 Organization and Progression Make sure the notebook has natural breaks clearly labeled tabs ideas are properly separated by paragraphs and ideas are 15 fluently connected 50 Appendix Provide the full MATLAB code checklists initial and final pseudocode final flowchart and any other aspects of the results not covered in the Discussion 35 section Format the additional results in accordance with the Technical Communication Guide Lab Participation Agreement Project Schedule and Team Meeting Minutes see the technical 10 communications guide pages 83 85 Instructor GTA End of Lab Signoff Lab 8A 28
23. turned to MATLAB Teams will use the break beam sensors to monitor when the train has reached the gate crossing area These sensors connect to analog pins 2 and 3 and will receive a numerical value that differs when the beam is broken or unbroken ENGR 1181 Lab 8 Train Project Project Description Arduino The Arduino shown in Figure 6 is an open sourced microcontroller and serves as the brain of the project The Arduino has 12 digital and 6 analog pins available Digital pins can be used as inputs to sense a high gt 2 5 volts or low lt 2 5 volts voltage by returning 1 or O respectively Digitals pins can also be used to provide a low current lt 40 ma 5 volts to a device when used as an output The Arduino samples the value of the voltage and converts the analog voltage value to a binary voltage value The Arduino uses a 10 bit analog to digital converters to do the above That is a O Volt input will be represented as 0000000000 and a 5 Volt input will be represented as 1111111111 Every other voltage value is some binary number in between The Arduino is programmed using a subset of C but students will be using a MATLAB program that uses keywords such as motorSpeed to execute commonly used Arduino code segments For example when using motorSpeed MATLAB is sending a simple code to the Arduino that jumps to an analogWrite statement that controls motor speed Figure 6 Arduino Microcontroller ENGR 1181 Lab 8 Train Proje
24. vary with the amount of voltage provided and the direction depends on the polarity See Figure 3 on the following page for a fully described layout of the train track ENGR 1181 Lab 8 Train Project Project Description Figure 2 N scale Train Locomotive ENGR 1181 Lab 8 Train Project Project Description Direction of Train Vehicle Roadway Crossing Gate amp Lights Train Station Approach Gate Departure Gate Power Supply Direction of Train Figure 3 Train Track Layout ENGR 1181 Lab 8 Train Project Project Description Railroad Crossing and Gate The railroad gate shown in Figure 4 is controlled by a servo motor that is attached to the Arduino To control the motor teams will need to specify an angle between 0 180 degrees The servo arm will stay at the specified angle until it is told to move again At the railroad crossing there will be two red LEDs that will flash to warn cars and pedestrians that a train is approaching These LEDs are attached to the Arduino in pins 14 and 15 Figure 4 Crossing Gate Figure 5 Break Beam Sensor Break Beam Sensors Figure 5 above depicts a break beam sensor Each sensor has an LED that is facing a photoreceptor The LED constantly shoots a red beam towards the photoreceptor While this beam is uninterrupted a low numerical value will be sent to MATLAB when the sensor status is checked When the red beam is interrupted a significantly higher value will be re
25. wchart of Algorithm e Create a flowchart to portray the how the train code algorithm works using a visual medium e Flowcharts can be created using Excel Look under the Insert tab for the shapes dropdown menu Many common flowchart shapes are listed there Final Program with Comments e Include the code from the final program used during testing e The code MUST have sufficient comments throughout Another programmer should be able to read these comments and have a good understanding of how the code works Final Testing Checklist e Located at the end of this document e This checklist must be signed by the team s Instructor or GTA Lab Participation Agreement e Located at the end of this document Check Out Procedure Sheets e Located at the end of this document e This sheet must be signed by the team s instructor or GTA for EACH lab session Grading Guidelines e Located at the end of this document 25 ENGR 1181 Lab 8 Train Project Project Notebook Guidelines Final Testing Checklist Group Instructor Class Time Date This sheet must be filled out and signed by a member of the Instructional Staff by the end of Lab C The Instructor TA must watch the program be initiated through MATLAB and will record the results below At approach sensor Yes No Points Earned 0 4 Comments Train speed decreases LEDs begin to flash alternately Closes after a delay Gate Routin Rural
26. wice in a row will not disrupt the train s performance A second train passing through the approach gate should not delay or alter the lights flashing and the gate being lowered Consider that any failure of execution by the program could result in an accident and potential loss of life in a real world setting Lastly the process must be repeatable on an infinite scale until manually stopped through the MATLAB command window This means that the train must run continuously until the command to stop is given via MATLAB There are numerous ways to successfully write this program so your program will not be exactly the same as any other team s program 22 ENGR 1181 Lab 8 Train Project Project Notebook Guidelines Project Notebook Guidelines 23 ENGR 1181 Lab 8 Train Project Project Notebook Guidelines Project Notebook Description Each team will complete a project notebook that is due by the last day of university scheduled classes before the reading day The notebook should follow the guidelines given below Teams should keep in mind that this notebook should be well organized and professional in appearance The Technical Communications guide is a great tool to reference while composing this report Project Notebook Reguirements The project notebook should be organized as follows 1 Cover Page 2 Table of Contents 3 List of Figures and Tables 4 Executive Summary 5 Introduction 6 Program Description for Developer
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