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Produino MPR121 3*4 Capacitive Touch Panel Button Module for Arduino
This is a breakout board for Freescales MPR121QR2. The MPR121 is a capacitive touch sensor controller driven by an I2C interface. The chip can control up to twelve individual electrodes£¬ as well as a simulated thirteenth electrode. The MPR121 also features eight LED driving pins. The voltage supplied should be between 1.7V-3.6V.