-[ Wed, Apr 08, 2009 at 04:32:41PM +0400, Paul Fertser ]---- > I beg to disagree. If you are talking about acceleration of the sensor > itself then you'll see that: 1. it's not actually accelerating if you > attach a reference frame to the Earth (the freerunner is laying > still). 2. The gravitational force applied to the sensor is directed > to the center of the Earth,
OK untill here. > so the reported "acceleration" should be positive too. The reported acceleration is positive, this is a fact (cat /dev/input/event3). The question is : is a positive acceleration accelerating downward or upward ? The wiki tells that a positive acceleration is downward (Z axe pointing down). This is not true, in my opinion. When standing still, the accelerometer must report an acceleration directed in the _oposite_ direction the the gravitational force. As it is reporting a positive acceleration, then the Z axe goes up. And I believe the other axes are inverted as well (which, as suggested by Michael, is easily provable by turning the FR around so that each axes points down). _______________________________________________ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
