MPR121 TouchPad

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The MPR121 capacitive keypad uses the MPR121 and 12 touch sensitive pads to give you a simple 'keypad' with an I2C output. The board also has four mounting holes allowing it to be used as an input system in place of traditional buttons. The 5V - 3.3V level convertor intergrated on this keypad provide you the options for 3.3V and 5V I2C interface for your microcontroller.


  • Low power operation
  • 3.3 V supply operation
  • 12 capacitance sensing inputs
  • Complete touch detection
  • Auto-configuration for each sensing input
  • Auto-calibration for each sensing input
  • Touch/release threshold and debounce for touch detection
  • 3.3V and 5V I2C interface, with Interrupt output


  • Switch Replacements
  • Touch Buttons
  • Touch Keypad
  • Touch Slide bar
  • Touch Wheel
  • Touchpad
  • Touch Panel
  • Near Proximity Detectio


Here is guide illustrate you how to connect MPR121 Touchpad to Arduino.

MPR121 wiring.jpg


[Arduno example]

[MPR121 datasheet]

[MPR121 Touchpad schematic]

How to buy

[Click here to buy MPR121 Touchpad]