This is a short instructable on how to use the Qprox IC (QT113G) as a touch sensor. Using this IC, you can essentially turn any object into a touch switch. This simple circuit may be hooked up to a microcontroller (in this case I used the MAKE controller board).
1. QT113 - can be ordered at Digikey DigikeyDigikey. Each one costs around $2. 2. 10mF capacitor 3. Wires 4. LED 5. breadboard or perfboard (if you choose to perf, you will obviously need a soldering iron and some solder)