> -----Original Message-----
> From: Alexander JJ Rice [mailto:a.j.j.rice@DURHAM.AC.UK]
> Sent: 07 December 2003 23:44
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [EE:] ADXL tilt sensor problems
>
>
> On Sun, 7 Dec 2003 18:10:02 -0500, Olin Lathrop
> <olin_piclist@EMBEDINC.COM> wrote:
>
> > D Yates wrote:
> >> I've heard of accelerometers
> >> which don't detect static acceleration fields like gravity,
> >
> > Let me guess, these were on the same web site selling free energy
> > perpetual
> > motion machines?
>
> Olin,
>
> Although at first glance this seems silly it is not, sure the
> accelerometer does detect static accelerations, but if you
> low pass filter
> it you could always leave just the dynamic portion of the signal which
> would effectively do the same thing. The other similar device
> would be a
> rate gyro with an integrator. I am sure both of these systems
> have found
> their way into a single black box that is simply marketed as
> perfrming the
> above feat.
>

Surely you would use a high pass filter to remove the low frequency/DC
components?

Mike




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