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Adafruit Industries LLC
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Adafruit Industries LLC
MPR121 12-Key Capacitive Touch Sensor Breakout Board
 
Adafruit Industries LLC
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MPR121 12-Key Capacitive Touch Sensor Breakout Board

MPR121 12-Key Capacitive Touch Sensor Breakout Board

Adafruit Industries LLC

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. Since it's a 3V-only chip, added is a 3V regulator and I²C level shifting so it’s safe to use with any 3V or 5V microcontroller/processor like Arduino. Also added is an LED onto the IRQ line so it will blink when touches is detected, making debugging by sight a bit easier on you. Included are a fully assembled board, and a stick of 0.1" header so you can plug it into a breadboard.

Specifications
  • Interface:I²C
  • Sensing Range:12 Buttons/Keys
  • Sensor Type:Touch, Capacitive
  • Supplied Contents:Board(s)
  • Utilized IC / Part:MPR121
  • Voltage - Supply:3.3V ~ 5V
Parts