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Building a Home Security System with BeagleBone
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In this chapter, we will cover the major components that almost all alarm systems have in common. By the end of the chapter you will realize that the so-called high tech alarm systems and access control systems are not really as complicated as some would like you to believe. That said, let's get started. Every alarm system in the world does two and only two basic things. • It monitors the world around it. If the alarm is your neighbor's dog, it keeps an eye on trespassers. If it is an alarm system, then the central control panel monitors a bank of contacts (switches) and waits for something to change (just like the dog). These contacts are the output parts of various kinds of sensors. This is how the sensor tells the panel that something has changed. There are many kinds of sensors, about which I will tell you shortly, but they all signal the panel in much the same way. • When the panel detects a change, it takes an appropriate action based on what the change was. It could be an alarm condition, or it could be a proper access control request. To use the dog scenario again, it could be you coming home from work, in which case the dog wags its tail. It could be the mailman, a bill collector, a burglar, or someone the dog doesn't know. In this case we have an alarm condition and the dog does its thing!
Bill Pretty - Personal Name
978-1-78355-960-2
NONE
Information Technology
English
2013
1120
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