> If you use homemade ring+contact sensors- they are cheap so use a number
> of them in different planes. Pick(PIC?) the one not shorted when arming.
> D

A varaition on this would be a pendulum with a magnet that swings past an
array of linear Hall effect sensors.  At arming time, one of those sensors will
have a particularly high reading.  Any (significant) variation from that reading
indicates motion.

I seem to recall a Circuit Cellar article about a joystick which used that as
its actuating mechanism, instead of a noisy pot.

Mike H.

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