Adafruit standalone capacitive touch sensor breakout momentary or toggle adafruit 1375 the adafruit standalone toggle capacitive touch sensor breakout boards operate without the need for a microcontroller using an at42qt1012 sensor chip they are of the touch on touch off type when a touch is sensed an on board led will alternately turn on or off and the output pin will follow high logic 1 when the led is on and low logic 0 when the led is off you can save power by isolating the led