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I²C - Wikipedia
I2C Communication Protocol - GeeksforGeeks
Inter-Integrated Circuit (I2C) Protocol - Arduino Docs
The Essential I2C Tutorial: All you need to know about …
I2C is a protocol for short distance communication between ICs on a single PCB using only two wires. This tutorial explains how I2C works, its advantages, speed, robustness, and how to use it with Arduino and PIC chips.