MPR121 Twelve-Key Capacitive Touch Module

Bring capacitive touch inputs into a compatible controller project with an MPR121 module and I2C interface.

✅ Build a touch-based control surface - Twelve sensing channels provide inputs for the project's appropriate electrode arrangement.

✅ Use a serial connection to the host - I2C carries the touch data without a separate controller input for every channel.

✅ Choose the module quantity - One-, two- and three-piece selections support a single build or several experiments.

Design the interaction around touch

A capacitive input can give a small electronics project a different control style from mechanical switches. Connect the module to the host and develop the electrode layout and software for the intended interaction.

Match the board's supply and logic levels, and test the electrode arrangement in its final enclosure. This is a sensing module rather than a finished keyboard, so the controller, control surface and application software remain part of the project.

Technical details

• Device: MPR121
• Function: capacitive touch sensing
• Channels: twelve
• Interface: I2C
• Supply described: 3.3 V
• Quantity options: one, two or three modules

Add a touch-input stage to your next compatible electronics build.