Proximity detectors are devices that use
mutual capacitancebetween itself and a nearby human body in order to detect a person's presence.
The human body is a great capacitor (
body capacitance), and the proximity detector's capacitancewill increase when a human is nearby. The air acts as a dielectric.
there are many types of proximity detector.common are
(1) magnetic proximity switch(2) infrared proximity switch
touch switch: another device made possible by body capacitance
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