here in pdf form (Rev Preliminary, July 2014)
Contents
1. Gulf Coast Data Concepts Analog Data Logger www gcdataconcepts com Model ADL16 1 Features 2 Applications e 16 channel data logger The ADL16 is applicable to e 0 5v input using basic input module e Recording analog signals e 500 mAh lithitum polymer battery e Monitoring multiple sensor channels for e User defined sample rate between 256Hz industrial systems control and once per 32 768 seconds e Recording strain gauge measurements e Simple text data files csv e Separate input modules allow for extended flexibility 3 Description e Time stamped data sets LED indicator lights for system status System operates as a USB mass storage device when attached to a computer Unique serial number to identify logger Logger weighs 2 30z 65g excluding input module e Small Form factor 3 L 2 W 0 8 H 7 6x5 1x2 0 mm The ADL16 is a simple and compact 16 channel analog data logger The modular design allows for versatile input configurations and the ability to separate the logger from the test setup The ADLI16 is configured using a text file and the USB connectivity allows quick access to the comma separated text data files Figure 1 ADL16 Analog Data Logger July 2014 Preliminary 1 of 15 www gcdataconcepts com USB Accelerometer Model ADL16 NOTE This is a preliminary edition of the ADL16 user manual and certain details are subject to change In particular the battery charge indication is not yet implemented as d2. Dynamic Range 4 3 Indicator LEDs System status is indicated by two LEDs see Figure 2 The Status LED blinks once per second indicating a properly operating system The Status LED blinks when the ADL16 is recording data in standby mode or is connected to a computer via the USB port The Data LED blinks when data is July 2014 Preliminary 3 of 15 www gcdataconcepts com USB Accelerometer Model ADL16 written or read from the microSD memory card In data logging mode the period at which the Data LED blinks depends on the sample rate and other configuration settings The Data LED also indicates the lithtum polymer battery charging status when the logger is attached to a USB port The statusindicators tag in the system configuration file turns off or changes the brightness of the status indicators see section 5 1 9 Figure 2 LED Indicators 4 4 Battery The ADL16 is powered by a internal hardwired 500mAh lithtum polymer rechargeable battery The internal battery management system recharges the battery when the ADL16 is plugged into a USB port or attached to a USB 5v power adapter The battery is not used when the system is connected to a computer USB port The Data LED blinks when the battery is charging according to the sequence illustrated in Figure 3 Note that the Data LED will also blink with USB data transfers when connected to a PC such as a file transfer Battery l
3. Supply 45v GND Figure 11 Input Module Channel Layout Figure 12 General 16 Channel Input Module Dimensions July 2014 Preliminary 15of15 www gcdataconcepts com
4. a set of tags and settings stored in a text file named config txt which is located in the root directory of the microSD card The system reads the configuration file at boot time Table 3 lists the configuration file tags A tag is followed by an equal sign and an applicable tag setting A line finishes with a newline character Ox0A Tags are not case sensitive Tab and space characters are ignored Lines starting with a semicolon are treated as comments and ignored by the system The system will use the default settings listed in Table 3 if the config txt file is not found p Do not use the Windows Notepad editor because it does not terminate new lines properly GCDC recommends Windows Wordpad or Notepad to edit the config txt file Table 3 Configuration File Tags and Descriptions Valid Settings Default microRes Off The presence of this tag sets the device to record time stamps with 0 1ms effective precision rebootOnDisconnect off on disconnect The presence of this tag causes the system to start recording after disconnect from a USB port sensorPower Off The presence of this tag activates the power supply to the input module samplePeriod Integer between 1 Period between samples expressed in seconds use and 32768 sampleperiod when sample rate is less than 1 Hz samplesPerFile An integer greater 28896 The number of lines of data per data file before a than 0 new file is created sampleRate Integer b
5. based files for configuration settings Therefore no special software is required to access or utilize the ADL16 For data analysis Gulf Coast Data Concepts recommends using a commercial or open source mathematics package such as MatLab Microsoft Excel OpenOffice Calc Octave R or similar applications 7 Troubleshooting Problem Resolution I press the on off button but the logger does not appear to activate and no LEDs blink Make sure the battery is charged Check the battery disconnect jumper is set properly The logger could be operating correctly but the status indicators are turned off Check the statusindicator option in the config txt file I press the on off button the blue LED blinks once per second but the red LED does not indicate logging The logger is in standby mode waiting for a start time to occur Check the config txt file for the start stop settings The blue LED blinks slowly The microSD card is not present or is Check that the card is inserted properly and the card is not corrupted corrupted I plug the logger into a USB port but the PC does not indicate an external drive present The microSD card is not present in the logger or is not inserted properly Check that the card is fully inserted into the logger The microSD card is corrupted or damaged Reformat the card or replace the card July 2014 Preliminary www gcdat
6. which is causing a brown out of the data acquisition cpu Try powering the sensors using a separate power supply system July 2014 Preliminary 14 of 15 www gcdataconcepts com USB Accelerometer Model ADL16 8 Appendix A Basic 16 Channel Input Module The basic 16 channel input module provides convenient screw post terminals for attaching sensors to the ADL16 data logger This input module does not provide any signal conditioning but includes a simple voltage divider network to adjust the input range to 0 5 volts with 100K ohm impedance Activate the logger sensorPower feature and the input module will provide a 5v regulated power source SOmA maximum total current draw The input module contains a unique serial number that is read by the logger and stored to the data file header This maintains traceability of the data file to the specific input module The voltage divider network increases the input range to 5 volts and changes the ADL16 sensitivity factor When converting data remember to multiply the sensitivity factor by 2 For example a raw channel value of 1743 counts converts as 1743 counts 610uV count 2 2 126460 volts Another way to approach the conversion is to divide the range by the resolution 5 volts 4096 counts 1220uV count Then 1743 counts 1220 uV count 2 126460 volts CH9 CH10 CH11 CH12 CH13 CH14 CH15 CH16 S S S S S S e O00 5v Sensor eno
7. 98 980 1085 3487 2158 1743 3126 119 2944 966 666 2310 1927 3900 3297 605 2181 1179 1407 2299 843 2134 3698 216 169 1559 2351 1779 477 122 2716 1589 2466 2066 2176 2637 183 703 2718 1992 3565 219 1715 1636 3675 2611 2288 1389 3914 3951 2731 3930 2542 1254 3612 3433 2791 943 269 813 1625 626 1443 1180 2324 3692 2398 1534 1186 3191 3527 2855 993 209 3997 319 2437 2956 1604 2957 3034 258 975 3923 2271 2137 3175 3166 1360 57 1389 1662 368 486 2561 2115 284 3501 1195 2959 1403 3403 2310 2211 1145 4015 3500 2443 3681 418 160 324 1096 834 447 399 4017 1609 2665 3516 1658 1711 1794 2683 1251 2208 468 2092 1642 1430 182 2660 1333 2593 3192 1668 18 930 2651 944 499 2071 3032 518 2860 3600 2263 1021 1687 1835 1714 3340 2322 1577 2104 1957 3016 1637 3757 3571 567 3688 1626 3613 3422 1019 776 1313 337 3248 3241 2244 378 1283 2860 278 3614 et 3 a a a Figure 10 Example Data File July 2014 Preliminary 12 of 15 www gcdataconcepts com 5 2 3 Data Conversion USB Accelerometer Model ADL16 The ADL16 records the raw digital data from the analog to digital converter Converting the data to engineering units will depend on the sensor and the signal conditioning included with input module Input modules built by GCDC will include instructions for converting the raw data 6 Software The ADL16 records data to comma delimited text files and uses text
8. aconcepts com 13 of 15 USB Accelerometer Model ADL16 Problem Resolution The USB connection could be faulty or the extender cable if present could be faulty Remove the extender cable and plug the logger into another USB port I press the on off button but the logger records only for a short period of time Check that the battery is fully charged The microSD card is full and data files must be deleted The logger seems to ignore the config txt file and use default settings Check that the config txt file is properly formatted and not corrupted Each setting should occur on a separate line Some IT organizations implement an automatic encryption of all removable media devices This will encrypt the config txt file and the logger will not be able to access the file Do not allow encryption of the device The start time in the data file header is incorrect Initialize the RTC The logger is exhibiting inconsistent behavior the LEDs stay on or blink slowly or the logger does not mount to a PC Remove the battery disconnect jumper see Figure 2 wait 10 seconds and then replace the jumper Disconnecting the battery resets the logger but does not affect the files on the microSD card The RTC will require initialization The ADL16 does not start consistently and the data files include invalid time stamps The attached sensors are drawing more current than ADL 16 can provide
9. connect T wo gt e da2uodopops mmm Figure 4 Battery Disconnect 4 4 1 Real Time Clock A real time clock RTC is integrated into the ADL16 and is used to determine time for each line of data recorded The RTC is set using a text file named time txt located in the root directory of the microSD card The system looks for the time txt file upon booting If the file exists the time stored in the file is loaded to the RTC and the time txt file is deleted The time information in the time txt file must be in the exact yyyy MM dd HH mm ss 24 hour format occur on the first line and end with a newline character Figure 5 provides an example time txt file that will initialize the RTC to 2 26 30 pm June 16 2014 July 2014 Preliminary 5 of 15 www gcdataconcepts com USB Accelerometer Model ADL16 The time file method of setting the RTC does not require special communication drivers so it can be implemented using a simple text editor Direct initialization of the RTC is possible but requires specific device drivers and software from Gulf Coast Data Concepts The RTC maintains 5ppm accuracy 40 C to 85 C which means that it will drift accuracy about 1 second every 2 days The RTC is powered by the battery at all times even when the logger is off 2014 06 16 14 26 30 Figure 5 Example Time Initialization File Initializing the RTC ensures that the start time and individual time stamps can b
10. e correlated to an absolute time the year month day hour minute second and fractional second An uninitialized or reset of the RTC will lead to indeterminate time stamps After unplugging the logger from the USB port the logger will load the time txt file when it is activated either by pressing the on off button or if the rebootondisconnect option is active Therefore there is a delay between when the time txt was created and when the logger actually loads the time information For most applications this simple method of initializing the clock results in sufficient accuracy 4 4 2 Memory Card The ADL16 stores data to a removable 8GB microSD flash memory card and is compatible with microSD and microSDHC type cards The ADL16 functions as a Mass Storage Device to computer operating systems when transferring data to and from the microSD memory card The Mass Storage Device interface is supported by all desktop operating systems and special device drivers are not required Tablet computers may not recognize the ADL16 due to USB device limitations set by the tablet manufacturer The logger needs only the config txt file to operate The ADL16 will use default configuration settings if the config txt is not present The config txt and time txt files must occur in the root directory see section 5 and section 4 4 1 The ADL16 will create a folder called GCDC if not already present to place the data files see sectio
11. e the logger will activate the power first and wait for a period of time before sampling the channels This allows the sensors to stabilize before a sample is taken The turnondelay defines the number of milliseconds to wait between power activation and data acquisition July 2014 Preliminary 10 of 15 www gcdataconcepts com USB Accelerometer Model ADL16 5 1 11 Example Configuration Files Example A The configuration file in Figure 2 will set the logger to record at 5 Hz and each data file will include 1 hour of data The standard time stamp precision is sufficient for such slow data rates example config file for 7 analog data logger product set sample rate SampleRate 5 file size to one hr samplesperfile 18000 turn on LEDs statusindicators Normal no need for microresolution microResolution no need to power sensors sensorPower Figure 8 Example A Configuration Example B Figure 23 shows a configuration file that records one sample every 5 seconds In this case the sensor power is activated for 10 milliseconds before a sample is collected The 10 millisecond delay allows the sensors to stabilize before a measurement is taken The power is deactivated after the input channels are sampled example config file for 7 analog data logger product sample every 5 seconds samplePeriod 5 file size to one day samplesPerFile 17280 turn on LEDs statusIndicators Normal
12. escribed in this document This manual was draft at firmware version 741 July 2014 Preliminary 2 of 15 www gcdataconcepts com USB Accelerometer Model ADL16 4 Electrical 4 1 Operating Conditions The ADL16 is protected from general handling conditions by the plastic enclosure but is not protected from adverse environmental conditions such as rain sweat splashes and water submersion The temperature range is limited primarily by the lithtum polymer battery capabilities Table 1 Operating Conditions Parameter Value Temperature Range Operating 5 F 130 F 20 C 55 C Temperature Range Storage 5 F 80 F 20 C 25 C Relative Humidity Operating and Storage lt 90 4 2 Input Channels The ADL16 incorporates a 16 channel multiplexed 12 bit analog to digital converter with a 0 2 5 volt input range This provides 4096 discrete levels or counts to represent the full scale input range of 2 5 volts The data file header states 610uV count sensitivity Input modules will adjust the signal range to match the capabilities of the logger For example the basic 16 channel input module allows for a 0 5 0 volt input at 100K ohm impedance see Appendix A Table 2 ADL16 Characteristics Resolution Cts FInputRange SV Integral Nonlineatit o w e EEC e e Differential Nonlinearit SignaltoNoise 2 Total Harmonic Distortion o ee ee ar Spurious Free
13. etween 1 128 and 256 startTime and See section 5 1 7 Defines when to start and stop recording stopTtime Sets the rate at which data is collected and recorded to the microSD card Stops data logging if 5v USB power is present see stopOnVusb section 5 1 8 statusIndicators Normal High LED status indicators can be activated with normal Off brightness Normal activated with high brightness High or completely deactivated Off Error Reference An integer greater When sensorpower is active turnondelay defines source not found than 0 the number of milliseconds between sensor power and data acquisition July 2014 Preliminary 8 of 15 www gcdataconcepts com USB Accelerometer Model ADL16 5 1 1 microRes The microres option sets the device to record time stamps with 0 1ms precision In micro resolution mode the time stamps are recorded as XX YYYYZZ where XX are seconds YYYY are 0 1 milliseconds and ZZ are spurious digits that should be ignored The micro resolution option should be implemented at sample rates greater than 200 hertz to provide the best timing precision The power saving features of the ADL16 are disabled in micro resolution mode and battery life is shortened accordingly 5 1 2 rebootOnDisconnect The ADL16 incorporates an on off button for initiating and terminating the data recording process Data recording is automatically started upon disconnect from a computer USB port if the tag wo
14. ife depends on the sample rate and sensor current draw Typical performance is approximately 20 hours of operation sampling at 128 Hz L 0 Charge LT L 50 Charge Le 75 Charge 100 Charge m Data LED On m Data LED Off Figure 3 Charge Indication Sequence July 2014 Preliminary 4 of 15 www gcdataconcepts com USB Accelerometer Model ADL16 A 5v supply via the USB connector provides extended operation of the device independent of the internal battery Common USB power adapters or USB battery packs for consumer electronics can provide the required 5v supply The logger does not implement power saving features when connected to an external power supply so power consumption will be higher than when using the internal battery The data logger may draw up to 250mA from the USB supply to recharge the battery Plugging multiple data loggers into a USB hub can exceed the power capacity of the hub This can cause brown outs of the logger and possibly damage the microSD card The logger is always on maintaining the real time clock and will eventually discharge the battery completely after several months The battery must be charged occasionally or remove the battery disconnect jumper to completely deactivate the device for long term storage see Figure 4 Keep in a cool 20 C 68 F dry environment to avoid damage of the battery szeectaz ezi3009 ane Ene oc li Swi sas Battery A Dis
15. n 5 2 Interrupting the power to the logger can result in corruption of the microSD card For example removing the logger from the USB port during file transfers to the PC Reformat the card if it becomes corrupted FAT32 file structure If data transfers to from the card become slow consider formatting the card using SD Card Formatter software provided by the SD Association www sdcard org July 2014 Preliminary 6 of 15 www gcdataconcepts com USB Accelerometer Model ADL16 4 5 Mechanical The ADL16 logger electronics module is enclosed in a black ABS plastic enclosure and assembled with two Philips head screws The logger module attaches to the input module via a 40 pin connector The two modules will click together when the connection is fully engaged The connector will maintain the attachment against moderate handling but an additional locking mechanism is recommended for long term deployments For example attaching the module assembly to a backing board as part of the experiment setup Wrapping the assembly with 2 diameter heat shrink tube 2 1 shrink ratio provides very good protection 4 5 1 Dimensions Figure 6 ADL16 Logger Module Dimensions DODD DODOOD Figure 7 Logger and Input Modules Connected July 2014 Preliminary 7 of 15 www gcdataconcepts com USB Accelerometer Model ADL16 5 System Operation 5 1 Configuration File The ADL16 is configured using
16. n the header Add the elapsed time to the start time to determine the complete time record of the sample Figure 10 represents an example data file The last line of the final data file records the reason for the termination such as shutdown switched off shutdown low battery shutdown max files exceeded shutdown vbus disconnect or connected to computer The line is designated as a comment with a semicolon Table 4 Data File Header Tags Attached to Describes the type of input module attached to the logger followed by the module unique serial number Fullscale Provides the fullscale sensitivity for example 610 uV count Rate at which data is recorded to the microSD card SamplePeriod Number of seconds between samples Battery voltage mV measured at the file start time The version control information of the firmware including unique serial number Title http www gcdataconcepts com Datalogger Version 741 Build date Jun 25 2014 SN CCDC40021316C32 7Start_time 2014 07 10 10 47 33 000 Temperature 32 00 deg C Vbat 3792 mv Attached to Unknown SN Unknown Fullscale 4096counts gt 2 500V 610uV count SampleRate 20 Hz Plime Ch1 Ch2 Chy Chayo ChS Ch6 Chla Cher Ch9 Ch10 Chi11 Chi2 Ch13 Chtt ChTS CATG 0 020 3523 3629 3985 3672 166 3930 1491 2146 3492 630 3080 3535 324 1995 1965 794 070 1853 2236 3861 1501 3340 493 1257 3148 3455 6
17. no need for microresolution microResolution activate power for sensors sensorPower turn on power 10 msec before taking a sample turnOnDelay 10 Figure 9 Example B Configuration 5 2 Data Files 5 2 1 File Creation The ADL16 creates a new data file when the system is booted or when the maximum number of data lines is reached in the previous data file A system boot condition occurs when the on off button is pressed 5v power is restored to the system via the USB connector or when the ADL16 is removed from a computer USB port with the rebootondisconnect feature enabled Data files are placed in a folder named GCDC and are named data XXX csv where XXX is a sequential number starting with 001 The system will create up to 999 files At the beginning of each file a header is written describing the system configuration and the current time when the file was created July 2014 Preliminary 11 of 15 www gcdataconcepts com USB Accelerometer Model ADL16 5 2 2 Data Format Data is written to files in comma separated text format starting with the file header information and followed by event data entries Table 4 lists the valid header tags although not all tags may occur in the header depending on the system configuration Each data line contains a time entry followed by the raw counts from the 12 bit analog to digital converter for each channel The time entry is seconds elapsed from the start time recorded i
18. opTtime The ADL16 starts and stops data recording based on the times defined using the starttime and stoptime tags The times must be in MM HH DD 24 hr format with the three entries separated by a space Entries marked with operate as a wild card The ADL16 continues to record after the start time unless defined otherwise by the stoptime tag Note that the configuration option does not include the month Example timing configurations Example 1 On the 15 day start recording at 12 30pm and stop recording at 6 00pm starttime 30 12 15 stoptime 00 18 15 Example 2 Start recording at the beginning of every hour and stop recording 45 minutes later starttime 00 stoptime 45 5 1 8 stopOnVusb The stoponvusb tag stops data logging operations when a 5v supply is detected on the USB connector Add the rebootondisconnect option so the logger will resume recording when removed from the 5v supply This configuration is convenient for halting data logging while charging the battery from a USB power supply Without the stoponvusb option default the device switches power from the internal battery to the USB 5v and continues to log data 5 1 9 statusIndicators The brightness intensity of the LED status indicators is defined using the statusindicators tag and valid settings of normal high and off 5 1 10 turnOnDelay When the logger is supplying power to the input modul
19. rd rebootondisconnect is included in the configuration file 5 1 3 samplesPerFile samplesperfile defines the number of data lines each file can have before a new file is created This tag controls the size of the data files into easily manageable lengths for later processing This setting is loaded as a signed 32 bit integer which can translate into very large data files The user should exercise caution before setting large files and test the end user application for data limitations 5 1 4 samplePeriod sampleperiod defines the number of milliseconds between samples and is used to configure sample rates less than 1 per second The logger will accept an integer value between than and 32768 Note that sampleperiod and samplerate are exclusive of each other 5 1 5 sampleRate The samplerate tag defines the data rate in Hertz or samples per second The logger will accept an integer value between 1 and 256 5 1 6 sensorPower The ADL16 can support up to 100mA to the input module for sensor power Add sensorpower to the configuration file to activate the logger power supply The sensor power is deactivated between samples to conserve power when the sample rate is less than 1 Hz Use turnOnDelay to establish a delay after activating the power and before a data sample is collected July 2014 Preliminary 9 of 15 www gcdataconcepts com USB Accelerometer Model ADL16 5 1 7 startTime and st
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