MPR121 Proximity Capacitive Touch Sensor Controller

Keypad Matrix

The MPR121 is a I²C device which can be used to implement touch keys. It can also function as a GPIO extender and can be used to drive LEDs.

Test Board

In order to try out the MPR121 I created a quick keypad.

Schematics

Galery

• 
• 
• 

Miscellaneous Links

• Datasheet
• MPR121 Quick Start Guide
• MPR121 Capacitance Sensing Settings
• MPR121 Capacitance Sensing — Filtering and Timing
• MPR121 Serial Communication
• MPR121 GPIO and LED Driver Function