The photoelectric switch (photoelectric sensor) is an abbreviation of the photoelectric proximity switch, which uses the occlusion or reflection of the light beam by the detected object, and is gated by the synchronous circuit to detect the presence or absence of the object. Objects are not limited to metal, and all objects that reflect light can be detected. The photoelectric switch converts the input current into a light signal on the transmitter, and the receiver detects the target object according to the strength or the presence or absence of the received light. A photoelectric switch smoke alarm commonly used in security systems is often used in the industry to count the number of movements of the robot arm.
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