Complete instructions for this episode of Weekend Projects can be found at
http://makeprojects.com/Project/Monkey-Couch-Guardian/2232/1
Combine an Arduino with a proximity sensor, and make an obnoxious device to discourage cats and other fur-shedding pets from jumping on beds and couches. This project will also introduce you to the SPDT relay, a fundamental component of hobbyist electronics projects.
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