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Building a Home Security System with Raspberry Pi

You're reading from   Building a Home Security System with Raspberry Pi Build your own sophisticated modular home security system using the popular Raspberry Pi board

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Product type Paperback
Published in Dec 2015
Publisher
ISBN-13 9781782175278
Length 190 pages
Edition 1st Edition
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Author (1):
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Matthew Poole Matthew Poole
Author Profile Icon Matthew Poole
Matthew Poole
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Table of Contents (11) Chapters Close

Preface 1. Setting Up Your Raspberry Pi 2. Connecting Things to Your Pi with GPIO FREE CHAPTER 3. Extending Your Pi to Connect More Things 4. Adding a Magnetic Contact Sensor 5. Adding a Passive Infrared Motion Sensor 6. Adding Cameras to Our Security System 7. Building a Web-Based Control Panel 8. A Miscellany of Things 9. Putting It All Together Index

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 accessible as creative material for anyone. Download it from fritzing.org.

The LED anode (the positive side) is connected to the D0 digital I/O (pin 11 of the connector or GPIO17). When this pin is switched on, it will provide a 3.3V supply to the LED.

The LED is connected to the Ground pin via a 220R resistor on the cathode (negative side). The...

You have been reading a chapter from
Building a Home Security System with Raspberry Pi
Published in: Dec 2015
Publisher:
ISBN-13: 9781782175278
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