Arduino and I²C

I²C, short for Inter-Integrated Circuit, is a serial communication protocol that allows multiple devices to communicate using just two wires — one for data (SDA) and one for clock (SCL). Originally developed by Philips (now NXP), I²C has become a widely adopted standard in embedded systems for connecting low-speed peripherals such as sensors, LCD displays, EEPROMs, and more to a microcontroller (see: diagram from NXP)

We will discuss hardware related topics of I²C in the electronics section, while the Arduino section focuses on the software side, showing how to develop code and communicate with I²C devices effectively. If you are interested in details download the official spec.

Now, let’s uncover I²C on a Arduino.