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Building a Home Security System with BeagleBone by Bill Pretty

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Chapter 2. Our Very First Alarm System

In this chapter we are going to design a single zone alarm system and learn how the basic components work. We will learn about comparators and how they are used in this case. We will also build and test a simple breadboard circuit that will simulate a single zone alarm. For example, the bell that rings when you enter a store.

Zones

A zone is an area that is being protected, and/or a collection of sensors that are protecting the zone. Zones can contain Passive Infrared Sensors (PIR sensors), glass break detectors, window contacts, or a combination of different sensors.

For example, "ground floor windows" could be a zone. Ground floor PIR sensors could be another zone. There are also "special" zones such as fire ...

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