MPR121 Capacitive Touch Sensitive 3x4 Keyboard Module

SKU: VM00445

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Switches are one of the most widely used components in electronics.A keypad is a set of keys or buttons arranged in a block. This capacitor touch keypad includes 12 keys and MPR121 IC on the back of the PCB.

The MPR121 capacitive keypad uses the MPR121 and 12 touch sensitive pads to give you a simple ‘keypad’ with an I2C output. These keypads function by measuring the capacitance of twelve electrode points. When an object comes close to the electrode connector, the measured capacitance changes. This signals the MPR121 that something has touched a button. The board also has four mounting holes allowing it to be used as an input system in place of traditional buttons. This keypad outputs 3.3V logic.

Technical Specification:

  • Operating voltage: 3.3V
  • Communication protocol: I2C
  • Operating temperature range: -40°C to +85°C
  • Interface: I2C
  • Chip: MPR121
  • Switches: 12
  • Connector: 5 Pin - Male Header
  • Size: 8cm*5cm (L*W)


  • 8 inputs are multifunctional for LED driver and GPIO complete touch detection
  • Auto-configuration for each sensing input
  • Auto-calibration for each sensing input
  • Touch/release threshold and debounce for touch detection I2C interface, with Interrupt output


  • Remote Controls
  • Mobile Phones
  • Lighting Controls

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