In the previous two parts published through Elektor .POST we’ve looked at the UART and SPI interfaces of the Raspberry Pi’s Expansion Header. Now, on our way to becoming electro-baking experts, we’ll take a look at the last of the Raspberry Pi’s serial interfaces, the I²C Bus.
 
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The Inter-IC or I²C is the final of the three serial interfaces you’ll find on the Raspberry Pi’s Expansion Header. The other two interfaces are an UART Serial Interface and the SPI interface (see parts #3 and #4 respectively).