The GCDC Human Activity Monitor (HAM) is a compact self-recording data logger available with several sensor variants. Data from the digital sensors are time stamped using a real time clock and stored to internal flash memory in simple text format. When connected via the USB to a personal computer, the HAM appears as a standard mass storage device containing the comma delimited data files and the user setup file. The HAM includes an internal 250mAh lithium-polymer rechargeable battery, which will recharge using USB power. Read more about our data logger product-line features.Buy On Amazon
For more details, specifications, and how to use the HAM, please refer to the user manual (.pdf). The user manual includes an example data file and instructions for converting the data and time stamps.
The HAM logger is configured using a simple text file called config.txt located on the microSD card. Below is an example config.txt file for the HAM-IMU+alt:
; PRODUCT_ID = HAM-IMU+Alt ;set mpu sample rate mpu_SampleRate = 200 ;set the length of the data file samplesperfile = 120000 ;control brightness of LEDs statusindicators = Normal ;uncomment following line to activate logger ;upon disconnect from USB rebootOnDisconnect ;activate max timing precision microres ;add gyro to data stream gyroOn ;add quaternion calculations to data stream ;quaton ;add magnetometer data to data stream ;mag data occurs at slower rate than accel/gyro magOn ; available accelerometer full scale ranges are 2, 4, 8 and 16g ;(2g is the default) mpu_accelFsr=16 ; available gyro full scale ranges are 250, 500, 1000, and 2000 ; (2000 deg/sec is the default) mpu_gyro_Fsr=1000 ;add temperature to data stream tempOn ; add pressure to data stream pressOn ; pressure measurement interval, in milliseconds pressureInterval = 200 ; interleave is the number of samples to skip between temp interleave = 5
Data is stored to simple text formatted .csv type files, which are easily imported into any spreadsheet or analysis software (Matlab, Octave, R, etc). Below is a example data file:
;Title, http://www.gcdataconcepts.com, X16-ham, MPU9250,BMP180 ;Version, 1191, Build date, Nov 15 2016, SN:CCDC401631CF4D7 ;Start_time, 2016-12-13, 10:14:06.308 ;Temperature, -999.00, deg C, Vbat, 4160, mv ;MPU SR, 200,Hz, Accel sens, 2048,counts/g, Gyro sens, 16,counts/dps, Mag SR, 10,Hz, Mag sens, 1666,counts/mT ;BMP180 SI, 0.200,s T interleave, 5 ;Deadband, 0, counts ;DeadbandTimeout, 0,sec ;Time, Ax, Ay, Az, Gx, Gy, Gz, Qw, Qx, Qy, Qz, Mx, My, Mz, P, T 0.009278,419,1982,115,-112,14,37,14387.006,-1341.886,-7672.993,879.769,140,42,97,101686,25650 0.029267,414,2006,129,-128,116,25,14376.811,-1319.962,-7693.561,899.752 0.049286,446,2058,125,-76,177,48,14369.909,-1302.481,-7706.366,925.528,134,50,103 0.069306,428,2074,164,-33,142,106,14364.279,-1296.570,-7713.545,960.759 0.089295,399,2059,120,-4,120,192,14360.300,-1302.421,-7714.470,1003.925,134,50,103