Light-Operated Streetlight (4)

Published:2011/7/8 6:03:00 Author:Sue | Keyword: Light-Operated, Streetlight | From:SeekIC

In the daytime, the photoresistor RG will have a low resistance value because of the light. IC's pin 2 and pin 6 will output high level(higher than 2Vcc/3). Its pin 3 will output low level. VL is not illuminated and VT is disconnected. The illumination EL is not illuminated. In the evening, RG's resistance value will be higher because of the light is becoming less. IC's pin 2 and pin 6 will have a lower voltage. When IC's pin 2's voltage is lower than Vcc/3, IC's inner trigger will be reversed. Its pin 3 outputs high level. VL is illuminated. VT is connected and the illumination power is on. EL is illuminated.



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