SEE_THROUGH_SENSOR

Published:2009/7/14 11:02:00 Author:May | From:SeekIC

In this circuit, an infrared emitter LED (LED1) is aimed at an infrared phototransistor (Q1). As long as the IR light path between the two remains uninterrupted, transistor Q2 will keep relay RY1 closed. Any opaque object blocking the light path will cause RY1 to open. This circuit is a see-through-type light sensor. Such units are often used as part-in-place detectors and parts-counter sensors.



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