While the Raspberry Pi packs and awful lot of punch for the price, and it’s fairly flexible where HW expandability is concerned, there are situations where you might want a bit more basic digital IO. Thankfully, it’s an easy problem to solve with an I2C-enabled device like the MCP23008 (for an extra 8 GPIO pins) or the MCP23017 (for an extra 16 GPIO pins). This tutorial will show you how you can get up and running quickly with either of these chips.
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These tutorials are fantastic! Really useful, great work.
Using a diagram of a sixteen-legged MCP3008 chip and calling it an eighteen-legged MCP23008 chip will mess up a beginner such as myself when I try to follow the diagram and connect the brown wire three pins from the right instead of six pins from the left.