> The I2C (Inter-Integrated Circuit) bus is a two-wire serial communication protocol used for connecting multiple integrated circuits (ICs) together. [[Arduino]]'s explanation is [here](https://docs.arduino.cc/learn/communication/wire/). [[daisy.audio]]'s explanation is [here](https://daisy.audio/tutorials/_a9_Getting_Started-I2C/). Older versions of the I2C specification used the term "[[master]]" in place of "controller" and "[[slave]]" in place of "target." Though these terms have been phased out, you may still see them used in datasheets and library code.