PROGRAMMABLE_CONTROLLER_LIGHT_SENSOR_INTERFACE

Published:2009/7/15 22:32:00 Author:Jessie | From:SeekIC

As long as an object remains between LED1 and Q1, no output occurs. But as soon as the object moves out from between the LED and the phototransistor, IC1 (a 555 timer) is triggered, producing a timed output pulse. This circuit can be used to indicate when a part has moved away from a location.



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