laser trip wire alarm system

Building a DIY Alarm System: The Concept So, you want to protect your property, or maybe a room, car, or even your backyard. The concept of an alarm system is to notify the ``alarm administrator`` that there is an intruder entering the previously designated boundaries. The triggers for this boundary could be as simple as a pressure sensor, or as complicated as a laser network. They all do the same thing, but some work better than others. Generally, in an alarm system, there is a central brain that deals with sensor input, user input, and notification output. For example, in a simple alarm..

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