By Matthew Poole
About This Book
- This e-book publications you thru development a whole domestic safeguard procedure with Raspberry Pi and is helping you remotely entry it from a cellular machine over the Internet
- It covers the basics of interfacing sensors and cameras with the Raspberry Pi for you to attach it to the skin world
- It follows a modular procedure for you to pick out the modules and lines you will want on your personalized domestic protection system
Who This ebook Is For
This booklet is for somebody who's drawn to construction a modular domestic safeguard procedure from scratch utilizing a Raspberry Pi board, easy electronics, sensors, and straightforward scripts. This booklet is perfect for enthusiastic amateur programmers, electronics hobbyists, and engineering execs. it'd be nice when you have a few easy soldering talents with the intention to construct a number of the interface modules.
What you are going to Learn
- comprehend the options at the back of alarm structures and intrusion detection devices
- attach sensors and units to the on-board electronic GPIO ports safely
- computer screen and keep an eye on hooked up units simply utilizing Bash shell scripting
- construct an I/O port expander utilizing the I2C bus and attach sensors and anti-tamper circuits
- seize and shop photos utilizing movement detectors and cameras
- entry and deal with your method remotely out of your cellular phone
- obtain intrusion signals and pictures via your e-mail
- construct a worldly multi-zone alarm system
The Raspberry Pi is a robust inexpensive credit-card-sized desktop, which lends itself completely because the controller for a complicated domestic safety process. utilizing the on-board interfaces to be had, the Raspberry Pi will be multiplied to permit the relationship of an almost countless variety of safeguard sensors and units. The Raspberry Pi has the processing energy and interfaces to be had to construct a worldly domestic safeguard approach yet at a fragment of the price of commercially on hand systems.
Building a house protection process with Raspberry Pi starts via exhibiting you the Raspberry Pi and the way to establish the Linux-based working procedure. It then courses you thru connecting swap sensors and LEDs to the local GPIO connector accurately, and the way to entry them utilizing easy Bash scripts. As you dive extra in, you'll the right way to construct an input/output enlargement board utilizing the I2C interface and gear provide, permitting the relationship of the massive variety of sensors wanted for a customary domestic defense setup.
In the later chapters of the ebook, we'll examine extra subtle subject matters reminiscent of including cameras, remotely gaining access to the approach utilizing your cellphone, receiving intrusion indicators and photographs through email, and more.
By the top of the booklet, you can be well-versed with using Raspberry Pi to energy a home-based safety method that sends message signals at any time when it truly is prompted and should be capable to construct a really refined and modular domestic protection procedure. additionally, you will achieve an outstanding knowing of Raspberry Pi's atmosphere and be ready to write the features required for a safety system.
Style and approach
This easy-to-follow advisor includes a chain of initiatives, the place each bankruptcy introduces a brand new thought and on the finish of the booklet, most of these techniques are introduced jointly to create a complete domestic safeguard approach. This e-book beneficial properties transparent diagrams and code
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Extra info for Building a Home Security System with Raspberry Pi
This means that its default state, when the switch isn't pushed, is high. [ 29 ] Connecting Things to Your Pi with GPIO When the switch is pushed, the value should be read as 0 or low. If you have more than two hands, you can try this by pushing the button and re-running the command. Or, we can just create a script to poll the switch state. /bin/bash sudo echo 27 > /sys/class/gpio/export sudo echo in > /sys/class/gpio/gpio27/direction # loop forever while true do # read the switch state SWITCH=$(sudo cat /sys/class/gpio/gpio27/value) if [ $SWITCH == 1 ]; then #switch not pushed so wait for a second sleep 1 else #switch was pushed echo "You've pushed my button" fi done When you run the script and then push the button, you should see You've pushed my button scrolling up the console screen until you stop pressing it.
This is likely to irreversibly render your board dead. We'll look at ways, later on in this book, to control devices with higher power requirements. Summary In this chapter, we introduced various ways to connect your Raspberry Pi to the outside world by looking at the various interfaces available on the GPIO. We've understood how to connect things to the digital pins on your Raspberry Pi's GPIO connector, and control and read them using simple Bash scripts. In particular, we've safely and properly connected a switch to a digital input pin, which will form the foundation for our home security detection circuits.
Fortunately, there are many integrated circuits (ICs) available that allow us to do this simply and easily. These ICs are called shift registers and perform serial-toparallel conversions, taking the data from the serial I2C bus and converting the incoming bits to a parallel representation by setting each of the parallel bus outputs. When reading the parallel bus data lines as inputs, the reverse happens, converting the bits into a serial form on the I2C bus; this is known as parallel-to-serial conversion.
Building a Home Security System with Raspberry Pi by Matthew Poole