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I hadn't even realised that we were on to Doug's DIY Test Equipment Challenge and, look, shabaz has finished already with his Cyclops-1000: An Electronic Eye for Rotational Speed Measurement. I bet he's sitting there thinking he's won. We can't let that go unchallenged, so here's my first try. I don't expect it will win; not just because I'm posting it in the wrong place and technically I can't win, but also because I've just thrown it together without all the careful thought and consideration t ...