MangOH Motion Service ====== This application is designed to operate on a [MongOH Red](https://mangoh.io/mangoh-red-new) WP85 board. Using **general input output** this project uses pthreads to probe the onboard bmi160 chip intermittently in order to detect a significant motion on the board. ## Prerequisites When cloning use ``git clone https://github.com/brnkl/motion-service.git``. ## Building Compile the project using wp85: ``make wp85`` ## Setting Variables To change the sensitivity of impact detection you must edit the `motionMonitor/motionMonitor.c` file. The Accelerometer measures acceleration in 3 dimensions, X, Y, and Z. These dimensions of acceleration are recorded and the magnitude of their resulting vector is calculated using ``double impactMagnitude = sqrt(x * x + y * y + z * z);``. As visualized in the image below. ![Magnitude](https://www.intmath.com/vectors/img/235-3D-vector.png) `#define DEFAULT_THRESHOLD_MS2 17` determines the magnitude of the resulting vector that will trigger the application to detect a sudden impact. If adjusting the value of `DEFAUTL_THRESHOLD_MS2` keep in mind that gravity implies a motionless magnitude of -9.8m/s^2. ## Bindings App.adef ``` ... bindings: { myClientApp.myComponent.brnkl_motion -> motionService.brnkl_motion } ... ``` Component.cdef ``` ... requires: { api: { brnkl_motion.api } } ... ``` ## Example For getting the current acceleration ```C struct Acceleration{ double x; double y; double z; }; struct Acceleration v = value; le_result_t result = brnkl_motion_getCurrentAccleration(&v->x, &v->y, &v->z); ``` To get a list of all recent impacts. ``` double xAcc[N_MAX_IMPACT_VALUES], yAcc[N_MAX_IMPACT_VALUES], zAcc[N_MAX_IMPACT_VALUES]; uint64_t timestamps[N_MAX_IMPACT_VALUES]; size_t xSize = N_MAX_IMPACT_VALUES, ySize = N_MAX_IMPACT_VALUES, zSize = N_MAX_IMPACT_VALUES, timestampsSize = N_MAX_IMPACT_VALUES; le_result_t r = brnkl_motion_getSuddenImpact( xAcc, &xSize, yAcc, &ySize, zAcc, &zSize, timestamps, ×tampsSize); ```