MPR121 Touch Controller

The MPR121 is a second-generation capacitive touch sensor controller from NXP, designed for low-power, high-performance touch and proximity sensing applications. This module provides 12 independent capacitive touch inputs, making it perfect for creating touch-sensitive buttons, sliders, and proximity sensors for Arduino, Raspberry Pi, and other microcontroller projects. The controller operates at 1.71V to 3.6V with an average supply current of just 29μA, making it ideal for battery-powered applications. It communicates via I2C interface and features built-in auto-calibration and noise filtering for reliable operation. The compact 3x3x0.65mm QFN package saves board space while delivering professional-grade touch detection. Common applications include touch interfaces for home automation, consumer electronics, industrial controls, and interactive displays. Choose this module for its proven reliability, low power consumption, and easy integration with popular development platforms.