TTP224 4 Channel Digital Capacitive Switch Touch Sensor
Add a nice four-button capacitive-sensing keypad to your project with these TTP224 4 Channel Digital Capacitive Switch Touch Sensors from PMD Way.
They're easy to use, simply connect between 3.3 and 5V DC to the power/GND pins - and the output pins will change state when pressed.
Onboard LEDs indicate button status so you can easily tell the status, or just have fun blinking the LEDs.
This board is also useful if you're interested in making your own touch-device as you can prototype with the TTP224 IC with this unit then build the IC into your own PCB.
Click here for schematic.