Looks good.  How well does it work if the vehicle is tilted when the 
alarm is armed?

Dave

Jinx wrote:

>I think I've found an arrangement that will work well. Even a few
>quick tests with OTS parts are encouraging
>
>Ball-bearing + ping pong ball + UGN3503 + magnet
>
>Depending on exact orientation, it'll put out anything from a few
>mV to >100mV AC on the mid-Vcc bias. Easily detectable with
>an ADC. I think it would be quite difficult to move a vehicle without
>disturbing this sensor. Me happy
>


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