One of my all-time favorite hardware hacks is the BEAM touch sensor made out of little more than a paper clip and a piece of guitar string. You can see this type of switch on the tail of Herbie the Mousebot.
Here’s a similarly ingenious switch that uses little more than pieces of plastic, a washer and three screws to create a tilt sensor that engages the switch when the plastic wheel turns. Nifty.
[Via Make]
