# Adafruit MPR121 Library [![Build Status](https://travis-ci.org/adafruit/Adafruit_MPR121.svg?branch=master)](https://travis-ci.org/adafruit/Adafruit_MPR121) Tested and works great with the Adafruit MPR121 * https://www.adafruit.com/products/1982 * https://www.adafruit.com/product/2024 * https://www.adafruit.com/product/2340 Check out the links above for our tutorials and wiring diagrams. These sensors use I2C to communicate, 2+ pins are required to interface Adafruit invests time and resources providing this open source code, please support Adafruit and open-source hardware by purchasing products from Adafruit! Written by Limor Fried/Ladyada (Adafruit Industries). MIT license, all text above must be included in any redistribution ## Compatibility MCU | Tested Works | Doesn't Work | Not Tested | Notes ------------------ | :----------: | :----------: | :---------: | ----- Atmega328 @ 16MHz | X | | | Atmega328 @ 12MHz | X | | | Atmega32u4 @ 16MHz | X | | | Atmega32u4 @ 8MHz | X | | | ESP8266 | X | | | Atmega2560 @ 16MHz | X | | | ATSAM3X8E | | X | | ATSAM21D | X | | | ATtiny85 @ 16MHz | | | X | ATtiny85 @ 8MHz | | | X | Intel Curie @ 32MHz | | | X | STM32F2 | | | X | * ATmega328 @ 16MHz : Arduino UNO, Adafruit Pro Trinket 5V, Adafruit Metro 328, Adafruit Metro Mini * ATmega328 @ 12MHz : Adafruit Pro Trinket 3V * ATmega32u4 @ 16MHz : Arduino Leonardo, Arduino Micro, Arduino Yun, Teensy 2.0 * ATmega32u4 @ 8MHz : Adafruit Flora, Bluefruit Micro * ESP8266 : Adafruit Huzzah * ATmega2560 @ 16MHz : Arduino Mega * ATSAM3X8E : Arduino Due * ATSAM21D : Arduino Zero, M0 Pro * ATtiny85 @ 16MHz : Adafruit Trinket 5V * ATtiny85 @ 8MHz : Adafruit Gemma, Arduino Gemma, Adafruit Trinket 3V