> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
Behalf
> Of Sean Breheny
> Sent: 05 March 2008 00:22
> To: Microcontroller discussion list - Public.
> Subject: Re: [EE]:: Tilt sensing using linear accelerometers
> 
> Hi Dave,
> 
> If you are out in space and being attracted by the gravity of a planet
> nearby, accelerating at 1 m/s^2, the accelerometer would read the same
> thing as it would if the planet were not there.

I disagree.  If the planet provided an acceleration of 1 m/s^2 due to
it's gravity, and the accelerometer was actually accelerating at the
same rate toward the planet, then it's output would be zero (1-1=0).  If
the accelerometer was subject to the same acceleration without the
influence of the planets gravity (by e.g. a rocket motor), or was
subject to the planets gravity but prevented from physically moving then
it would most certainly be producing an output.

Regards

Mike

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