The Monkey Couch Guardian is simple in its design, but it gets the job done. Using an Arduino, a cymbal-banging monkey toy and a proximity sensor, the build causes the monkey to start clanging when anything gets near enough to it. Subsequently, your pet should be scared off when it tries to make its way near furniture it shouldn’t be on. You don’t have to use a monkey — any loud toy will do the trick. Head over to Make for a full parts list and guide on how to make the Monkey Couch Guardian yourself.
Monkey Couch Guardian [Make]