Table of Contents
Advertisement
Quick Links
Advertisement
Table of Contents
Related Manuals for Gulf Coast Data Concepts X16-5
Summary of Contents for Gulf Coast Data Concepts X16-5
- Page 1 X16-5 USB Accelerometer Data Logger User Manual...
-
Page 2: Table Of Contents
Table of Contents 1 Introduction............................1 About This Manual........................1 Document Conventions......................1 Appendix..........................1 Product Summary........................2 Feature List..........................2 Items Included with X16-5......................3 1.6.1 Single Unit Purchase......................3 1.6.2 5 Unit Kit...........................3 Component Names........................4 Quick Start Guide........................5 2 Operation..............................7 USB Interface...........................7 Memory Card...........................7 Battery............................8 2.3.1 Expected Battery Life......................8 2.3.2 Power Saving Strategies....................9... - Page 3 Figure 2: X16-5 and Accessories.......................3 Figure 3: 5 Unit kit of Loggers........................3 Figure 4: X16-5 Data Logger Components....................4 Figure 5: Exploded View of the X16-5......................4 Figure 6: Connecting to PC........................5 Figure 7: Editing the Config.txt File......................5 Figure 8: Starting the X16-5........................6 Figure 9: Sensor Orientation........................7...
-
Page 4: Introduction
(page 22). Document Conventions The quick start guide in section 1.8 provides a basic summary of operation to begin using the X16-5 data logger. This user manual continues into further details of configurations and capabilities starting in section 2. -
Page 5: Product Summary
Product Summary The X16-5 is a low cost and compact self-recording accelerometer data logger. Data from the digital 3- axis accelerometer sensor is time stamped using a real time clock and stored to a microSD card in simple text format. When connected via the USB to a personal computer, the X16-5 appears as a standard mass storage device containing the comma delimited data files and the user setup file. -
Page 6: Items Included With X16-5
Items Included with X16-5 1.6.1 Single Unit Purchase The X16-5 is packaged with the logger, a USB extender cable, and a screwdriver. 1.6.2 5 Unit Kit A kit includes 5 X16-5 loggers, a USB extender cable, and a screwdriver. Gulf Coast Data Concepts... -
Page 7: Component Names
# 6-32 M achine Screw PCB Enclosure (Top) PCB Enclosure (Cap) O n/O ff Button # 6-32 H ex Nut PCB Enclosure ( Bottom) Figure 5: Exploded View of the X16-5 Gulf Coast Data Concepts Page 4 X16-5, Rev New... -
Page 8: Quick Start Guide
Quick Start Guide The X16-5 is a simple, economical solution to capture continuous motion data and quickly deliver the information for analysis. The following instructions outline the steps to begin using the X16-5. Configuration settings and mounting methods will depend on the particular application. -
Page 9: Figure 8: Starting The X16-5
Velcro, or a spot of cyanoacrylate glue are sufficient methods of attachment. The X16-5 is small and light weight so attachment methods do not need to be substantial. Double-sided tape, a spot of cyanoacrylate glue (contact cement), zip-ties, magnetic base, or adhesive putty are example methods of attachment. -
Page 10: Operation
X16-5 as a typical USB external memory drive. Therefore, the X16-5 will allow file transfers to the microSD card like a common USB flash drive. When connected to a PC, the X16-5 deactivates logging and operates only as a USB interface to the microSD card. Note that some tablet operating systems block access to USB mass storage devices and will not recognize the X16-5. -
Page 11: Battery
The X16-5 is powered by an internal 500mAh lithium-polymer rechargeable battery pack. The internal battery management system recharges the battery when the X16-5 is plugged into a USB port or attached to a USB 5v power adapter. The red charge indicator LED turns on (see Section 2.5) when the battery is charging and off when the battery reaches full charge. -
Page 12: Power Saving Strategies
4.1.1) Setting The RTC A real time clock (RTC) integrated into the X16-5 determines the time for each line of data recorded. The RTC is initialized using a user-created text file named “time.txt” that is loaded by the logger upon booting. -
Page 13: Status Indicators
The blue LED blinks when the X16-5 is recording data, in standby mode, or is connected to a computer via the USB port. The red LED blinks when data is written or read from the microSD memory card. In data logging mode, the period at which the red LED blinks depends on the sample rate and other configuration settings. -
Page 14: System Configuration Options
System Configuration Options The X16-5 is configured using 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 logger reads the configuration file at boot time. -
Page 15: Absolutetime
The logger will store data files into the directory defined by “dirName”. The directory must be defined with a preceding slash, such as “dirName=/GCDC”. By default, the data directory is set to the root location /GCDC. Gulf Coast Data Concepts Page 12 X16-5, Rev New... -
Page 16: Disablecharger
2.6.9 rebootOnDisconnect The X16-5 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 word “rebootOnDisconnect” is included in the configuration file. -
Page 17: 2.6.10 Samplesperfile
(“;sectalign”). This procedure ensures that the next wake up event starts on a new memory sector, which makes flash memory allocation easier for the logger. For the end-user, ignore these “;sectalign” comment strings. Gulf Coast Data Concepts Page 14 X16-5, Rev New... -
Page 18: Example Configuration Files
The deadband and dwell settings configure the device to record at least 5 seconds of data when a change greater than 0.1g is detected. The deadbandtimeout setting forces a sample write every hour. ; Example X16-5 Config file ; set to 25Hz samplerate = 25 ;... -
Page 19: Example C
Data Interpretation Data Files The X16-5 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 X16-5 is removed from a computer USB port with the “rebootondisconnect”... -
Page 20: Data Conversion
;Title, http://www.gcdataconcepts.com, X16-5, Analog Dev ADXL345 ;Version, 2031, Build date, Dec 2 2020, SN:CCDC1016D2A5B00 ;Start_time, 2020-12-15, 10:15:24.390 ;Uptime, 5,sec, Vbat, 3270, mv, EOL, 3200, mv ;SampleRate, 100,Hz ;Deadband, 0, counts ;DeadbandTimeout, 0.000,sec 0.163,10,24,-2054 0.173,21,28,-2063 0.183,17,12,-2090 0.194,3,7,-2097 0.204,30,5,-2061 0.214,24,24,-2061 0.224,17,26,-2082 0.234,44,16,-2063 0.245,19,33,-2072... -
Page 21: Time Stamps: Absolute Mode
3.3.3 Acceleration The X16-5 records the raw digital data from the accelerometer sensor. This helps reduce processor load, increase sample rate capability, and avoids data errors due to floating point calculations. The 16- bit data, or 65536 discreet counts, covers the full range of the +/-16g sensor. Therefore, the conversion factor is 65536 / 32 = 2048 counts/g. -
Page 22: System Details
The sensor's clock precision and drift are undefined. For example, a selected sample rate of 50 Hz may actually push data at 52 Hz. The X16-5 incorporates a precise real time clock to independently time stamp the data as it leaves the sensor and to ensure that accurate timing is recorded to the data file. -
Page 23: Sensor Special Features
13-bit resolution to the 16-bit data recorded in the data file. The X16-5 will support sample rates of 800, 1600, and 3200 Hz but the X16-5 deactivates the oversampling and FIR filter and records the native 13-bit resolution from the sensor. However, these sample rates are not guaranteed and the time stamps may become inaccurate or the logger operation could become unstable. -
Page 24: Dimensions
<90% Dimensions The X16-5 electronics are enclosed in a three-part semi-transparent blue plastic enclosure. The top and bottom enclosure components and the printed circuit board are secured together with a 0.75” long #6- 32 screw and nut. A slip-on cap protects the USB connector. The overall dimensions are 1.01” wide, 1.04”... -
Page 25: Troubleshooting
The errors accumulate quickly over long time periods, which produce poor displacement results. Multiple sensors types and complex filtering algorithms are required to reduce errors in the displacement calculations. Gulf Coast Data Concepts Page 22 X16-5, Rev New... - Page 26 I want to calibrate my X16 logger. The logger does not have provisions for implementing user-defined calibration coefficients and any corrections must be performed post- process. Gulf Coast Data Concepts Page 23 X16-5, Rev New...
-
Page 27: Appendix
“fingers” changes. The change in electrical capacitance between the fingers is proportional to the displacement of the spring-mass system. The capacitance is measured, filtered, and converted to a digital output representing acceleration. Gulf Coast Data Concepts Page 24 X16-5, Rev New... -
Page 28: Figure 23: Simplified Mems Accelerometer Design (L) And Actual Mems Accelerometer (R)
3D motion. This combination of sensors is considered an inertial measurement unit (IMU) system. Some IMU systems include an additional magnetometer sensor (compass) and GPS to further aid the calculations of motion. Gulf Coast Data Concepts Page 25 X16-5, Rev New... -
Page 29: Using "R" To Analyze Data
Matlab with nearly the same capabilities. Although, Octave is a significantly larger download and more complicated installation than R. We favor R because it's small, easy to learn, and free. Figure 24: R Command Line Interface Gulf Coast Data Concepts Page 26 X16-5, Rev New... -
Page 30: Introduction To R Commands
In the above example, 'a' was assigned the value '4' and can be used later. R works with vectors and matrices as well. > b<-c(1,2,3) ;”c” is a function call that creates a vector > b [1] 1 2 3 > a*b [1] 4 8 12 Gulf Coast Data Concepts Page 27 X16-5, Rev New... -
Page 31: Online Resources For R
> fun(2,2) [1] 4 R will read a data file from the X16-5 data logger using the “read.table” function. > data<-read.table(“d:\\GCDC\\data-001.csv”, sep=”,”,comment=”;”, fill=TRUE) “data” is a matrix of 4 columns containing the time, Ax,Ay,Az values from the file. Values within the matrix are accessed as follows: >... -
Page 32: Example Scripts In R
Several example applications using R scripts are available at the GCDC website or are included with the X16-5 data logger. These examples educate the user on basic operation of the data logger, interpretation of acceleration data, and the use of R scripts.
Need help?
Do you have a question about the X16-5 and is the answer not in the manual?
Questions and answers