Buy an Axon, Axon II, or Axon Mote and build a great robot, while helping to support SoR.
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why do things the hard way?
why do things the hard way? an led and phototransistor (no op amp required) or, better still, hall effect and magnet. arduino has many tach and freq counter sketches to make this easy.
it's cheap but i wonder about it's accuracy