Let's get physical: How to use GPIO pins on the Raspberry Pi
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Until now, this series has focused on the Raspberry Pi's software side, but today we'll get into the hardware. The availability of general-purpose input/output (GPIO) pins was one of the main features that interested me in the Pi when it first came out. GPIO allows you to programmatically interact with the physical world by attaching sensors, relays, and other types of circuitry to the Raspberry Pi.
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