digital compass modules

[Denis]

I think the accelerometers don't provide enough accuracy.

2008/1/23, joerg <joerg.twinklephone at gmx.de>:
> Am Mi  23. Januar 2008 schrieb Tilman Baumann:
> > François TOURDE wrote:
>
> > > Maybe the 3D accels can do that. And the GPS can be used as a bearing
> > > indicator, when you move. No magnetic device needed in this case.
> As stated in prev posting, GPS _can_not_ deliver bearing of device at all.
> Imagine having the GTA in your pocket while moving - there's not the
> faintest
> relation between movement vector as seen by GPS and bearing of GTA.
>
> >
> > Gyroscopes is what you look for. ;)
> > Accelerameters don't see rotational movings.
> Though gyro won't help here at all, i think TWO 3D-accelerometers placed
> some
> distance from each other in a system make a nice gyro with the aid of some
> mathematics in driver. IIRC there was mentioned more than one acc-meter for
> the GTA. I thought that's exactly for this purpose.
>
> jOERG
>
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