Paul Fertser <[email protected]> writes: ?> Michael Tansella <[email protected]> writes: >>> So, the fact that when idle the accelerometers report a positive Z value >>> implies that the Z axe is actually upward. >>> >>> Agree ? >> >> Yes I think that's right. If you hold the Freerunner that any arrow of an >> axis >> points to the earth middlepoint then the sown value must be >> negative. > > 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, so the reported "acceleration" should be > positive too.
Thinking about it a bit more, i now understand that if you insist on talking about accelerations, the Z axis should point upwards. -- Be free, use free (http://www.gnu.org/philosophy/free-sw.html) software! mailto:[email protected] _______________________________________________ Openmoko community mailing list [email protected] http://lists.openmoko.org/mailman/listinfo/community
