How SPI & I2C Work - Communication Protocols | Embedded Systems Explained

In part of my Embedded Systems Explained series I'll be explaining the fundamentals of SPI & I2C and telling you how to experiment with them at home.
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0:00 Introduction
0:17 Why do we need SPI & I2C?
1:37 SPI
5:09 I2C
8:41 How to experiment?
9:30 Outro

My name is Fabi and I am an Engineer and Tech Enthusiast from Romania. On my YouTube channel I do thorough reviews of gadgets, showcase my programming projects and show you which cars I am driving.

This is part 2 of my Embedded Systems Explained series!

Why do we need SPI and I2C though when we already have UART? Well, there's 2 main drawbacks to this serial communication. First of all, it's asynchronous, secondly, UART is meant for only two devices, whereas many times, multiple devices need to be connected to a system through the same communication protocol.

SPI or Serial Peripheral Interface is a communication protocol which allows for data transfer between multiple systems. The SPI protocol allows for only one controller (or main device) on the SPI bus.

I2C or Inter-Integrated Circuit allows for communication between multiple systems, with the difference being that the I2C protocol also allows for more than one controller on the I2C bus.