> I probably should have included the time response issue in the original
> post - sorry!
>
> I initially looked at some electrolytic tilt sensors, but the time response
> was far too slow.  The tilt data will be used to control a mechanical system
> designed with a 0.1s time response, and we'd like to match the electrical
> system response to within roughly half that. This is the primary reason we
> are using accelerometers instead of tilt sensors - all the electrolytic
> companies I talked to recommended at least a 0.5 second sampling rate, some
> as much as 2-3s (PLEASE correct me if you know of anything faster?!).
> Apparently they're more designed for relatively smooth transitions, instead
> of the jerky movements my project is working with.  We do have an onboard
> schaevitz capacitive tilt sensor for "steady and level" output, but it
> doesn't seem to work so well for moving readings.
>
> > You might want to look at electrolytic tilt sensors - these have some
> inherent damping, and you can
> > add more in software if necessary, or maybe combine with an accelerometer,
> e.g.use a weighted
> > avaraging scheme where the weight of the tilt data is reduced when
> acceleration is high.

Take a look at the following link. The two wheeled balancing robot (inverted pendulum)
uses the tilt sensor you have, along with a gyro and software filtering to achieve a VERY
stable platform. There are even video clips of the thing operating under less than ideal
conditions without falling over!

Regards,
Stephen D. Barnes

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