Security system sensors such as motion detectors, reed switches, pressure mats, glass-break detectors, infra-red beams, and conductive film can be very handy for all sorts of things including home automation systems, interactive art installations – and sometimes even security systems! Almost all security system sensors provide a simple switched output that changes state based on whether the sensor has been tripped or not, which means that when connected up in a circuit they behave just like a switch that is activated automatically. That makes them extremely easy to connect to an Arduino to read their status.
Read more at http://www.practicalarduino.com/projects/security-sensors
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