I'd like to hear what you come up with as well. Presently I just use the magnet/coil sensor pairs that you can buy in any bike store. You just hook the shield to ground, and the other wire to, say, an input-capture pin of a 68HC11, with a 3.3 K pull (...) (27 years ago, 11-Aug-97, to lugnet.robotics.handyboard)
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