Datasheet

https://adafru.it/dKF

Rename the uncompressed folder Adafruit_MPR121 and check that the Adafruit_MPR121 folder contains

Adafruit_MPR121.cpp and Adafruit_MPR121.h

Place the Adafruit_MPR121 library folder your arduinosketchfolder/libraries/ folder.

You may need to create the libraries subfolder if its your first library. Restart the IDE.

We also have a great tutorial on Arduino library installation at:

http://learn.adafruit.com/adafruit-all-about-arduino-libraries-install-use

Load Demo

Open up File->Examples->Adafruit_MPR121->MPR121test and upload to your Arduino wired up to the sensor

Thats it! Now open up the serial terminal window at 9600 speed to begin the test.

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

tutorial

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