Tim Newsom wrote: > Ok Steve. I grant you that the first derivative of acceleration is > velocity... How do you propose to gain any velocity information when > the acceleration measured is zero as would be the case if you are at a > constant velocity? This is why I am saying you would need some better > source for velocity. > I grant you that the times when a car is at a constant velocity may > be few... Or it may be that when on cruise control on any flat road > you may actually see zero or almost zero acceleration. > > OTOH, detecting the direction that a person turned with the > accelerometer may be very useful in dead reckoning. > > --Tim
Math. The acceleration to 50 kilometers per hour then staying at that speed produced an acceleration vector in a given direction. Until there are mathematically equal opposing deceleration(s), you have a known velocity and vector. It's all in the math :) Zero acceleration only means your current velocity and vector are constant. -david _______________________________________________ OpenMoko community mailing list community@lists.openmoko.org https://lists.openmoko.org/mailman/listinfo/community