Raspberry Pi Pinout

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Capacitive Touch HAT

This Raspberry Pi add-on board provides 12 capacitive touch inputs and all the logic to read them over a simple I2C communication bus.

Baded on the MPR121 chip, this HAT allows you to create electronics that can react to human touch, with up to 12 individual sensors.

Code

from Adafruit_MPR121 import MPR121
from time import sleep

cap = MPR121.MPR121()

last_touched = cap.touched()
while True:
    current_touched = cap.touched()
    for i in range(12):
        pin_bit = 1 << i
        if current_touched & pin_bit and not last_touched & pin_bit:
            print("{} touched!".format(i))
    last_touched = current_touched
    sleep(0.1)

Details

Capacitive Touch HAT