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Building a Home Security System with Raspberry Pi by Matthew Poole

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Getting acquainted with the GPIO

Before we embark on connecting lots of things to our Pi board, it might be a good idea to just get acquainted with the GPIO through a couple of simple projects that will help us understand how to interact with the digital I/O pins using shell scripts.

Let there be light

This simple little project shows how to connect a GPIO output to an LED, and switch it on and off using shell commands.

The following diagram shows how to connect up the circuit using a breadboard:

Let there be light

Note

The pretty diagram that you just saw was produced using a free software tool from fritzing, which is an open-source hardware initiative to make electronics ...

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