MPR121 Proximity Capacitive Touch Sensor Controller

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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

Revision a

MPR121 Keypad.svg

Revision b

Galery

Miscellaneous Links