Datasheet

This sensor comes as a tiny hard-to-solder chip so we put it onto a breakout board for you.

Since it's a 3V-only chip, we added a 3V regulator and I2C level shifting so its safe to use

with any 3V or 5V microcontroller/processor like Arduino. We even added an LED onto the

IRQ line so it 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. For contacts, we suggest using copper foil or pyralux, then solder a wire that

connects from the foil pad to the breakout.

https://learn.adafruit.com/adafruit-mpr121-12-key-capacitive-touch-

sensor-breakout-tutorial

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