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  proximity sensor,proximity switch,

Touch sensor is acts according
to the sensation the environment
electric capacity change output
The signal, it may or approaches
the way through the direct contact, or
passes through the indirect object to induce and changes from the
human body accommodates the body electric capacity level change,
outputs a comparison signal
The induction indirect object nearly may be any dielectric medium
(insulator), like glass, plastic,Wood, ceramics and so on
When the human body, the object contact or approaches, the
sensor outputs a low level, otherwise outputs the high level, outputs for
the electronic switching signal