OUTDOOR_LIGHT_CONTROLLER

Published:2009/6/17 2:31:00 Author:May | From:SeekIC

A neon bulb and a CdS photocell enclosed in a light-tight enclosure forrn an optocoupler. A diac/triac combination is used to provide the snap-switch effect. A second CdS photocell acts as the main sensor. As darkness approaches, the resistance of R4 begins to increase. At a threshold level, the diac triggers the triac and causes the neon bulb to light. This reduces the resistance of R6, causing the diac to trigger the triac, which lights the neon bulb and provides power to the load.As moming light comes up, the process is reversed. The neon bulb goes out and the SCR turns off.



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