Adafruit 12-Key Capacitive Touch Sensor Breakout – MPR121 – STEMMA QT

Create interactive projects with the Adafruit 12-Key Capacitive Touch Sensor.

Standard mechanical buttons can be very limiting. However, this MPR121 Capacitive Touch Sensor detects touch through electricity. It measures the change in capacitance when you touch an electrode. Consequently, you can hide your buttons behind plastic or wood.

Key Features:

• 12 Individual Inputs: It features twelve separate touch electrodes. Because of this, you can build a full numeric keypad easily.

• STEMMA QT Connectivity: Includes JST SH 4-pin connectors. Therefore, you can chain it with other sensors without soldering.

• Adjustable Sensitivity: The chip handles all the complex filtering. Furthermore, you can fine-tune the touch levels in your code.

• I2C Interface: It uses only two pins to communicate. Simply connect it to your Arduino, ESP32, or Raspberry Pi.

Why should you choose the MPR121? Are you building a “banana piano” or a secret switch? Because of its high sensitivity, it works through many materials. Moreover, it supports any conductive material like wire or paint. Furthermore, Adafruit provides excellent libraries for CircuitPython and Arduino. Therefore, you save hours of development time. Simply clip an alligator cable to start testing.

Technical Specs:

• Sensor Chip: Freescale MPR121.

• Inputs: 12 Capacitive touch pads.

• Interface: I2C (STEMMA QT / Qwiic).