Got to ask Andy. What was the application? Can you say? Sounds interesting!
I'm thinking of using the accelerometer for Tilt input but so far it seems
sort of marginal in terms of resolution (I'm using the slightly older 2G
sensor not the latest updated E version - I picked up a few a while ago and
have just got around to using them).

BTW have you ever used any of this stuff in any of those fast targets err
surface craft you like to play around with. Is it possible to add any sort
of stability enhancement (or would that spoil all of the fun...).

Andy

----- Original Message -----
From: "Andrew Kunz" <akunz@tdipower.com>
To: <PICLIST@mitvma.mit.edu>
Sent: Wednesday, October 18, 2000 12:50 PM
Subject: Re: [PIC]: Using 2 CCP: Compare failed if Capture event the same
time


> >Almost a correct guess. What I'm actually doing is using the capture
input
> >to read from and Analog devices accelerometer (which generates a PWM
style
> >output prop to the G force). But yes the compare part of the CCP is being
> >used to generate an RC pulse! Actually I think I can simply switch
between
> >the two (I have the time available), I want to keep the two PWM chans to
> >generate a set of PWM outputs for speed control!
>
> First, make sure you can get the part of Analog if you are making more
than one.
> They are really hard to get right now (I have several on order since May
and
> they're telling me April 2001) and will cost a lot more than they quoted
> earlier.
>
> I have used this exact setup.  Works great!
>
> You can keep the one input always set to the ADXL device and integrate the
> results constantly (hint hint).
>
> The PWM output you can switch back and forth between two servos using a
logic
> chip (demux).  Then you can update them as frequently as you want.  I had
a
> design using a GAL to use the two channels as inputs, then flip one pin
and some
> software to turn them into outputs, and they would go out on another two
pins
> from the GAL.  Super-accurate mixing, only used 3 pins to get 2 inputs and
2
> outputs with .5uS resolution.  The logic was all very fast and short code,
> leaving lots of codespace to do things like variable mix ratios, expo,
etc.
>
> Andy
>
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>
>
>
>

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