In this small tutorial or better called experiment we take a look at touch sensors.
Touch sensors are used for faucets, industrial switches and so on. You can imagine a nice solution..

So to get started we look at the components
- QT113-D Touch Sensor (parallax)
- 5 V voltage regulator (if you use a 9V battery
- 1 led for testing
- off course some wires and a test-board
- 2 resistors.
- cap 103 or 104

* additional look at the parallax scheme in the data-sheet on the page:
http://www.parallax.com/

Or just connect the parts like the picture to make a switching touch sensor:

later on we discuss the touch-sensors in details, integrated in a nice project this will be more clear. So keep posted!