Last time we looked at the UART Serial Interface of the Raspberry Pi’s Expansion Header. In this project we’ll take a look at one of Raspberry Pi’s other serial interfaces—the SPI Bus.
 
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The Serial Peripheral Interface (SPI) is the second of the three serial interfaces you’ll find on the Raspberry Pi’s Expansion Header. The other two interfaces are the UART Serial Interface (see Part 3) and the I2C interface.