You should then see 'hello world' messages sent through serial on both of your Arduino masters. Wire as shown for a 5V board like an Uno. That's all, now connect Arduino Uno's I2C pins ( A4 and A5 ) between each board, not forgetting the pull-up (1.2kΩ is fine) resistors for both SDA & SCL. Using the Mini I2C STEMMA QT Gamepad with Arduino involves wiring up the Gamepad to your Arduino-compatible microcontroller, installing the AdafruitSeesaw library and running the provided example code. Wire.write('hello world from 0x2 to 0x1') Wire.write('hello world from 0x1 to 0x2') After lots of googling, I finally got an answer thanks to the official Arduino Forum : I should use multi-master I2C to allow all my Arduino's to talk to each other (and that doing, interrupting receivers as it would be the case with slaves).ĭoing this is in fact pretty simple : you only to use the Arduino's official Wire (I2C) library as following.

Wiring Wire as shown for a 5V board like an Uno.

I've been working since many weeks (months) on designing a home automation 'box' project, and could hardly find a way to get my Arduinos (actually bare ATMega328 + Arduino's Optiboot bootloader) communicating together without having the (physical) master poll all the other ♜s continuously. Using the Mini I2C STEMMA QT Gamepad with Arduino involves wiring up the Gamepad to your Arduino-compatible microcontroller, installing the AdafruitSeesaw library and running the provided example code.

Wire library for arduino i2c