This easy-to-use 12 channel capacitive touch sensor breakout board starring the MPR121 adds lots of touch sensors to your next microcontroller project. The MPR121 supports I²C, which can be implemented with nearly any microcontroller. You can select one of 4 addresses with the ADDR pin, for a total of 48 capacitive touch pads on one I²C 2-wire bus. Using this chip is a lot easier than doing the capacitive sensing with analog inputs as it handles all the filtering for you and can be configured for greater or less sensitivity. This sensor comes on a breakout board with an added 3V regulator and I²C level shifting for safe use with any 3V or 5V microcontroller/processor like Arduino. An LED on the IRQ line will blink when touches are detected, making debugging by sight a bit easier on you. Comes with a fully assembled board, and a stick of 0.1" header so you can plug it into a breadboard.