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I just wanted to give a heads-up to anyone doing PIR triggered props. Electronics Goldmine have PIR detectors on sale for $3.99 until May 31st (or until they sell out). The ones they have were designed with a wireless transmitter, but they include easy instructions to hack them for hard wiring. Here's a link:
http://www.goldmine-elec-products.com/prodinfo.asp?number=G4567
http://www.goldmine-elec-products.com/prodinfo.asp?number=G4567