A motion detector is an electrical device that utilizes a sensor to detect nearby motion. Such a device is often integrated as a component of a system that automatically performs a task or alerts a user of motion in an area. They form a vital component of security, automated lighting control, home control, energy efficiency, and other useful systems
There are various motion sensor as listed below
Passive infrared (PIR) - PIR sensors are sensitive to a person's skin temperature through emitted black-body radiation . .
Ultrasonic - These detect motion through the principle of Doppler radar, and are similar to a radar speed gun. .
Tomographic motion detector - These systems sense disturbances to radio waves as they pass from node to node of a mesh network.
Video camera - With the proliferation of low-cost digital cameras able to shoot video, it is possible to use the output of such a camera to detect motion in its field of view using software.
Gesture detector - Photodetectors and infrared lighting elements can support digital screens to detect hand motions and gestures with the aid of machine learning algorithm
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