Adafruit 12-Key Capacitive Touch Sensor Breakout - MPR121
Adafruit Industries, LLC mail
OSHWA UIDUS000407 Project Website
April 30, 2020
United States of America
The MPR121 has support for only I2C, which can be implemented with nearly any microcontroller. You can select one of 4 addresses with the ADDR pin, for a total of 48 capacitive touch pads on one I2C 2-wire bus. Using this chip is a lot easier than doing the capacitive sensing with analog inputs: it handles all the filtering for you and can be configured for more/less sensitivity. Click the link labeled 'Project Website' to find out more.
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