About this product
The MPR121 capacitive touch sensor module monitors up to 12 electrodes over I2C and provides filtering, per-electrode autocalibration, and an interrupt output. Four selectable addresses let several devices share one bus, and electrodes can be pads, foil, or conductive paint for touch keys, sliders, and proximity sensing. The controller runs from 1.71 to 3.6 V, so board voltage compatibility should be checked before connecting 5 V logic.