MPR121 I2C touch module - 12 buttons - Adafruit 1982

Index: ADA-03405 EAN: 5904422354169

The module with the MPR121 system that implements 12 of the capacitive touch buttons. Pins can be connected to any of the objects conducting the electric current. The board communicates over I2C, it enables, for example, to create a music tool from a fruit.

MPR121 I2C touch module - 12 buttons - Adafruit 1982
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Manufacturer: Adafruit
Compatibility: Arduino


The module with the MPR121 system that implements 12 of the capacitive touch buttons. To the holes with the pitch of 2.54 mm, you can connect, using the wires, any conductive elements and create from them the keyboard. The device works with: metal tools, fruits, vegetables and water.



The pins are holes for soldering the popular goldpin connectors - 2.54 mm pitch - strap is included in the kit for self-soldering.MPR121 chip operates with a voltage of 3 V, however, the board has a converter that allows you to connect 5 V to the pins of the I2C bus.


The product is compatible with Arduino

Manufacturer has prepared auser manualalong witha library on the GitHub for Arduino users.



Adafruit MPR121 moduł dotykowy


Pin Description
VIN Supply voltage from 3 V to 5 V
GND The ground of the system.
SCL Clock line of the I2C bus.
SDA The data line of the I2C bus.

Change of the address of the I2C bus:

  • ADDR is not connected: 0x5A
  • ADDR connected to 3V: 0x5B
  • ADDR connected to SDA: 0x5C
  • ADDR connected to SCL: 0x5D



  • Supply voltage: 3 V to 5 V
  • Communications: I2C bus
  • Address of the bus:0x5Aby default with the possibility of changes to 0x5B, 0x5C or 0x5D using the ADRR pin
  • Built-in voltage converter - lines operate with a voltage of 5 V
  • The holes are suitable for installation of the goldpin strap, pitch of 2.54 mm (in the kit for self soldering)
  • 2 x Stemma QT
  • Dimensions: 33 x 19 x 4 mm


Package width 7.5 cm
Package height 8 cm
Package depth 0.2 cm
Package weight 0.005 kg

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