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  1. Basics of the I2C Communication Protocol - Circuit Basics

     
  2. I²C - Wikipedia

  3. I2C Communication Protocol - GeeksforGeeks

  4. Inter-Integrated Circuit (I2C) Protocol - Arduino Docs

  5. 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.