After many experiments with the accelerometers, I notice that there is, on my FR, a considerable difference between the readings from the 2 devices. Aside from the noise issue, the difference between the measured gravity between the 2 devices is of the order of 1m/s**2, device 0 being lower than device 1.
Is there any way of calibrating the output from these devices? Simple noise suppression using thresholds appears to aggravate the problem. In my tests, the error computing the angles between the local gravity vector and the device axes when the FR is at rest on a flat surface appears to be in the range -1.5 to +1.5 degrees, something that would appear to make these devices more or less useless for anything beyond very crude estimates of local acceleration or gross changes of position. -- Iain B. Findleton Tel: 514-457-0744 _______________________________________________ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
