We did just this in our R2-D2 project! But you can also use I2C to connect just two Arduinos together.
This is great for connecting one or more Arduinos to a Raspberry Pi for example. I2C allows you to connected numerous devices together using only two wires. You’ll aslso need it for projects that use barometric pressure sensors, or accelerometers, or even OLED displays! I2C Explained Simply If you plan on linking multiple Arduinos or connecting an Arduino to a Raspberry Pi, its an incredibly useful tool to have in your pocket. In this tutorial we will cover how I2C works and show some real world examples. It allows serial communications between many devices over just two wires. I2C is an extremely common protocol integrated into many products.
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