A motion alarm is the most basic security device on the market today. Basically, when an unauthorized movement passes before it, the circuit jumps into motion and sounds an alarm or switches the lights on, whatever it is programmed to do. Its basic function is thus to detect an unwarranted presence and either scare it [...]
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The principles by which motion detector alarms operate are complex. Type motion alarm detector into any search engine and you will be overwhelmed by the information returned. In this article we will look at just the very basic principles behind the operation of these devices.
First, there are active motion detector alarms and passive [...]
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