On Fri, 27 May 2005, Jinx wrote:

> So far I've thought of suspending the whole circuit on nylon thread,
> or just the wire/ring on thread or a metal chain. It has to be both
> sensitive and rugged. The Sensitive New Age Guy of alarm triggers
> if you like ;-)

Does it have to be cheap too ? (can you use Maxim parts ?). There was a 
thread on the piclist about 2 years ago that discussed exctly this and 
the conclusion was that a 2-axis accelerometer would be good, or a 
subcritically damped electrolytic level sensor.

Your chain solution does not work as designed (to put it simply, there 
is a trick that involves tying 3 equal threads to the top of a glass of 
water, full of water, tying them into a knot above it and then grabbing 
the knot and swinging the device any way you like - there will be no 
spillage as long as the threads are taut).

But if you make an electrolytic attitude sensor it should work. Is this 
a demo model or must it work 'forever', pass tests, refuse to freeze 
solid in winter etc ?

Peter
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