An infrared sensor is an electronic device, that emits in order to sense some aspects of the surroundings. An IR sensor can measure the heat of an object as well as detects the motion.IR sensor Detect Heat also.
A relay is an electromagnetic switch operated by a relatively small electric current that can turn on or off a much larger electric current.
A microphone is a device that translates sound vibrations in the air into electronic signals or scribes them to a recording medium. Microphones enable many types of audio recording devices for purposes including communications of many kinds, as well as music and speech recording.
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