Datasheet

Thats it! Now open up the serial terminal window at 9600 speed to begin the test.
Make sure you see the "MPR121 found!" text which lets you know that the sensor is wired
© Adafruit Industries
https://learn.adafruit.com/adafruit-mpr121-12-key-capacitive-touch-
sensor-breakout-tutorial
Page 13 of 20