SparkFun Touch Shield (MPR121QR2)

The MPR121QR2 IC is a great way to build simple capacitive touch interfaces, and now it’s even easier to incorporate into your Arduino projects with the touch shield.

The touch shield has

• 9 capacitive touch pads
• headers for the remaining 3 electrode connections so that with this shield you can have a total of 12 touch sensitive buttons.
• An on-board logic level converter allows it to work with 5V and 3.3V Arduino boards.

Simply solder on some header pins and stack it on to your Arduino for a convenient input device. Check below for some example code to get you started.

Documents:

• Schematic
• Eagle Files
• Datasheet (MPR121QR2)
• Hookup Guide
• GitHub (Design Files & Example Code)