How about using some kind of gravity based sensor (like the bubble, for example) along with a 2 axis accelerometer? The accelerometer would measure vertical and for/aft accelerations. Then it's a simple matter of taking the the components of the vector into consideration. Figure out what angle the bubble/pendulum is at, then subtract the horizontal and vertical forces acting on it due to vehicle acceleration. A fair amount of math to do in a small uC, and you'd need to calibrate it well enough to suit the application, but perhaps it would work.

I don't know, just $.02 from some kid still learning this stuff...

-Tony





> The bubble (actually the fluid around the bubble) will be moved around
> by any acceleration including gravity.
> You basically can't sense gravity directly without picking up
> acceleration too.
>
> Robert Ussery wrote:
> > Hmmm... I just had another idea...
> > How about a bubble level with some IR interrupt sensors
> along it? The bubble
> > shouldn't be too affected by acceleration, right?
> >
> > - Robert

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