Using a motion detector as a sensor, a home automation system allows certain events to happen automatically. Motion detectors can automatically trigger a light to come on, a camera to start recording, or an alarm to listen to. Motion detectors can be the eye of your home automation system. How Motion Detectors Work Most modern motion detectors are PIR (passive infrared) sensors. This means that the detector does not sense motion but instead changes the level of infrared light (heat) or heat. How to change the light is configurable, this is referred to as the sensitivity of the detector. Motion detectors work best when a warm body touches their front as a person walks. PIR detectors are less sensitive to slow speeds or approaching objects. The general sensing range for a PIR motion detector is 25 to 35 feet (8 to 11 meters) from the sensor. Shortage of PIR detectors PIR detectors measure heat and therefore can interpret any sudden change in heat as speed. These may include a sudden sunb...
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