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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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