SMSLib 1.4

SMSLib is the free library you can use with SeisMac and SeisMaCalibrate to access the Sudden Motion Sensors in recent Macintosh laptops. Written in Objective-C, it provides easy and stable access, abstracting hardware differences across eleven different models of laptop.
For better accuracy, you can use SeisMaCalibrate to calibrate your laptops Sudden Motion Sensors. SMSLib is open source, released under the University of Illinois/NCSA Open Source License.
For example, if you open the Terminal, change to the directory containing smsutil, and type:
./smsutil -i0.01 -c1000 -atxyz -s09 >capture.txt
then smsutil will start sampling every 10ms, running for 1000 samples (10 seconds), writing one line per sample into the file capture.txt, with each line including the time in milliseconds since smsutil started, and the calibrated x, y and z axis values, all separated by tabs.
Enhancements:
- Improved debugging data (now shows 10Hz sine waves, decaying over 3 seconds, with X, Y and Z axes staggered by 1 second)
- Improved calibration with MacBook Pro Core 2 Duo 17" (Y and Z axes reversed)