Building a Home Security System with Raspberry Pi电子书

Building a Home Security System with Raspberry Pi

Table of Contents

Building a Home Security System with Raspberry Pi

Credits

About the Author

About the Reviewers

www.PacktPub.com

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Why subscribe?

Free access for Packt account holders

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Downloading the example code

Errata

Piracy

Questions

1. Setting Up Your Raspberry Pi

Which flavor of Pi?

Raspberry Pi Model A

Raspberry Pi Model B

Raspberry Pi Model B+ and Model 2

Model comparison table

So which one?

Preparing the SD card

Downloading the Raspbian image

Using Microsoft Windows

Using Linux

Booting your Pi

Expanding the file system

Using the raspi-config utility

Setting up your Pi

Getting up to date

Getting the right time

fake-hwclock

ntp

Talking of security…

What is this sudo thing anyway?

Connecting via Wi-Fi

Summary

2. Connecting Things to Your Pi with GPIO

Prerequisites

Say hello to the GPIO

Digital I/O pins

The I2C bus

The SPI bus

The UART serial bus

USB ports

Power connections

Getting acquainted with the GPIO

Let there be light

Getting flashy…

Adding a switch

Pulling yourself together

The detection script

The most elaborate light switch in the world

The illuminating script

Summary

3. Extending Your Pi to Connect More Things

Prerequisites

The I2C bus

Just 2 wires

What's your address?

There is a parallel universe

Serial-to-parallel conversion

Give me power

Building an I2C expander

The I2C port expander circuit

Let's walk through the circuit

Building your expansion board

Using ready-made expansion boards

Hobbytronics MCP23017 expander port kit

PiFace Digital I/O expansion board

Gertboard

Summary

4. Adding a Magnetic Contact Sensor

Prerequisites

The working of magnetic contact sensors

Setting up the I2C port expander

Enabling the I2C Bus

Installing the I2C tools package

Finding our devices

Setting up the port expander

Connecting our magnetic contact sensor

Monitoring the sensor

Anti-tamper circuits

Getting into the zone

Summary

5. Adding a Passive Infrared Motion Sensor

Prerequisites

Passive infrared sensors explained

Setting up your PIR sensor

Give me power (again)

Connecting our PIR motion sensor

12V alarm zone circuits

Alarm circuit protection

How it works

Wireless PIR motion sensors

433-MHz wireless alarm systems

Connecting a 433-MHz receiver

The alternative approach (because we have no choice)

The receiver wiring diagram

Logging detection data

Summary

6. Adding Cameras to Our Security System

Prerequisites

The Raspberry Pi camera module

Connecting the camera module

Setting up the camera module

Testing the camera module

Be a video star

Caught on camera

You have new mail

Setting up the e-mail sender client

Sending attachments

Where was that taken?

Night vision

An illuminating experience

The Elaborate light switch re-visited

Is that a badger?

Using USB cameras

Installing the webcam

Taking a snap

Snap snap snap

The multicamera setup

The Slave driver

Summary

7. Building a Web-Based Control Panel

Installing the web server

Testing the PHP5 installation

Being in control

Arming yourself

The master configuration file

Creating the web page

The control panel HTML template

Giving it some style

Making it dynamic

Getting a bit of help first

The main PHP code

I'm someone else

Remote access to our control panel

Setting up a dynamic DNS account

The Raspberry Pi dynamic DNS client

Setting up a static IP on your Raspberry Pi

Port-forwarding

Summary

8. A Miscellany of Things

Arming and disarming the system

Driving inductive loads

Beyond intrusion

A simple water detector

How it works

A simple temperature sensor

How it works

A carbon monoxide detector

Remote administration for our Raspberry Pi

Getting Webmin

Updating the repository sources

Importing the signing key

Accessing Webmin locally

Remotely accessing Webmin

Summary

9. Putting It All Together

Alarm system diagram

Overview of the system elements

A +12V power supply

A +3.3V power supply

The opto-isolator input module

The port expander

An arm/disarm switch

Alarm outputs

Designing the control scripts

Building the control script

Exploring the script code

Declarations

Updating config settings

Setting up the GPIO

Setting up the I2C port expander

Decoding the zone inputs status

Initialization

The system monitoring loop

Arming the system

Monitoring the zones

Entry delay

Sounding the main alarm

Disarming and resetting the system

We're done (almost)…

Automatically starting the system

Preserving the SD card

Creating a RAM-based file system

Conclusion

Tips for building systems

Summary

Index