I2C

I2C (Inter-Integrated Circuit) is a communication protocol used to communicate between devices. The communication is synchronous, meaning both devices share a common clock signal. I2C allows connecting upto 127 devices on a the same two wires mentioned below. Each device gets a unique address and master knows which device it's communicating with, slave devices can be addressed individually.

There are two wires:

• SDA (Serial Data) - sends data between devices
• SCL (Serial Clock) - provides the clock signal

Pros:

• Only two wires required
• Supports multiple devices on the same bus

Cons:

• Slower than SPI