Sources: http://www.electronics-manufacturers.com/info/sensors-and-detectors/motion-detector.htmlhttp://machinedesign.com/article/sensor-sense-passive-infrared-motion-sensors-0710http://www.familyhomesecurity.com/5-types-of-motion-detectors/http://www.alarmsystemreviews.com/motion-detector-microwave-infrared-info.htmlhttp://www.ehow.com/about_5505579_types-motion-sensors.html
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