Jeez, Spark Fun has another spiffy part I really want to tinker with, an ultrasonic range finder – “The EZ1 Range Finder is surprisingly simple to use, and astonishingly accurate. Point it at a wall, find out how many inches you are away. Point it at your hand, find out just how long your arms really are…” Link.
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Nice! I made something that worked like this as my engineering thesis, along with a partner. It wasn’t quite that small when mounted on a breadboard though. :)