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Description

Updated in 2021 - Now featuring STEMMA QT connectors for quick connectivity.
Easy-to-use 12-channel capacitive touch sensor breakout board.
Supports only I2C, which can be implemented with nearly any microcontroller.
Select 1 of 4 addresses with the ADDR pin, for a total of 48 capacitive touch pads on one I2C 2-wire bus.
Handles up to 12 individual touch pads.

> Add lots of touch sensors to your next microcontroller project with this easy-to-use 12-channel capacitive touch sensor breakout board, starring the MPR121. This chip can handle up to 12 individual touch pads. 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. This sensor comes as a tiny hard-to-solder chip so we put it onto a breakout board for you. Since it's a 3V-only chip, we added a 3V regulator and I2C level shifting so its safe to use with any 3V or 5V microcontroller/processor like Arduino. We even added an LED onto the IRQ line so it will blink when touches are detected, making debugging by a bit easier on you. Item Specifics Model: MPR121 1 - Fully assembled board 1 - stick of 0.1" header to plug into a breadboard Suggested contacts: copper foil or pyralux Dimensions: 33mm x 19mm x 2mm / 1.3" x .8" x .1" Weight: 2.2g Uses I2C 7-bit address 0x5A (can be set to 0x5B, 0x5C or 0x5D)

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Adafruit 12-Key Capacitive Touch Sensor Breakout - MPR121 [ADA1982]

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