555 light control streetlights circuit

Published:2011/5/22 9:10:00 Author:TaoXi | Keyword: light control, streetlights | From:SeekIC

As the figure 17-27 shows, the light control circuit uses the photosensitive components and the 555.etc to form the trigger circuit. In the daytime, the 2CU2B photoconductive resistance receives the illumination, so it has the low resistance, pin-6 has the high electrical level (>2/3VDD), 555 resets, J releases, CZ has no power, so the streetlight turns off; at night, the photoconductive resistance has the high resistance, pin-2's electrical level is less than 1/3VDD, 555 sets, J closes, the streetlight turns on.



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