Intro

This chapter is about communication protocols and peripherals used with them.

A communication protocol is a series of steps that the devices involved agree upon, in order to encode and decode the messages exchanged (communicate).

1. Asynchronous serial communication with the UART peripheral.
2. I2C serial communication protocol and peripheral.
3. SPI serial communication protocol and peripheral.

There are many others! And sometimes devices have their own language and their datasheet must be read. But the ones listed above are very common.

Have fun

Check out any website listing sensors, and without tempting yourself to buy things, look at which communication protocols they use. Here are a few from Wikimedia Commons:

• Analog to Digital Converter, uses I2C protocol.

  By Pradeep717 - Own work, CC BY-SA 4.0, Link

• Barometric Pressure Sensor

  

  oomlout, CC BY-SA 2.0, via Wikimedia Commons

• Temperature Humidity Sensor (its own protocol)

  

  Ji Hyoung Ryu, Muhammad Irfan, Aamir Reyaz, CC BY 4.0, via Wikimedia Commons

• Pressure Sensor (SPI and I2C)

  

  SparkFun, CC BY 2.0, via Wikimedia Commons