You should then see "hello world" messages sent through serial on both of your Arduino masters. 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. Wire.write("hello world from 0x2 to 0x1") Wire.write("hello world from 0x1 to 0x2")
The library includes a hardware and software bus manager, and example device drivers for I2C Humidity and Temperature Sensor (Si70XX), Remote 8-bit I/O expander (PCF8574/PCF8574A), Digital Pressure Sensor (BMP085), and Single/Multi-Channel 1-Wire Master (DS2482). 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. The TWI library is an abstract interface for I2C device drivers. The pins to be used for the serial data (SDA) and serial clock (SCL) control lines can be defined at run-time. It utilises the pinMode(), digitalWrite() and digitalRead() functions. The libraries for this sensor are typical of this style of library. SoftWire is a software I2C implementation for Arduino and other Wiring-type environments. You can find Arduino-compatible libraries for many devices that use the Wire library, but never expose it directly in their APIs.
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. To use I2C communication on an Arduino microcontroller, you use the Wire library, which is built into the Arduino IDE.
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