Adafruit 12-Key Capacitive Touch Sensor Breakout - MPR121

Add versatility and interactivity to your next microcontroller project with a 12-channel capacitive touch sensor breakout board featuring the MPR121. This efficient chip manages up to 12 individual touchpads and supports I2C, making integration with most microcontrollers seamless.

Offering a simplified approach to capacitive sensing, it filters noise and allows sensitivity adjustments. With the ADDR pin, expand to 48 touchpads on a single I2C 2-wire bus. Designed with ease in mind, this breakout board includes a 3V regulator and I2C level shifting to ensure compatibility with both 3V and 5V systems, including Arduino.

A built-in LED on the IRQ line provides visual touch detection feedback, simplifying debugging. The package includes a fully assembled board and a stick of 0.1" header for quick breadboard connections. For touch contacts, copper foil or pyralux is recommended, connecting via soldered wires to the breakout.

To get started quickly, utilize the provided Arduino library and tutorial, with straightforward steps to port code to other microcontrollers. Comprehensive resources include a tutorial detailing sensor wiring, compatibility with Arduino and CircuitPython/Python, and sample codes for data logging and touch detection.

Enhance connectivity with SparkFun Qwiic compatible STEMMA QT connectors on the I2C bus, eliminating the need for soldering I2C and power lines. Simply use a STEMMA QT adapter cable to connect to your preferred microcontroller, opening up even more peripheral possibilities.