Chapter 17. Data Buses

In this chapter you will

  • Learn about the I2C bus

  • Understand how to use an EEPROM (electrically erasable read-only memory) and a port expander on the I2C bus

  • Learn about the SPI bus

  • Learn how to use a digital rheostat on the SPI bus

An Arduino communicates with other devices via a data bus, a system of connections that allow two or more devices to exchange data in an orderly manner. A data bus can provide a connection between the Arduino and various sensors, I/O expansion devices, and other components.

The two major buses of most importance to the Arduino are the Serial Peripheral Interface (SPI) bus and the Inter-Integrated Circuit bus (I2C). Many useful sensors and external devices communicate using these buses.

The I2C Bus

The ...

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