555 high-performance streetlights photoelectric control circuit

Published:2011/6/2 18:47:00 Author:TaoXi | Keyword: high-performance, streetlights, photoelectric control | From:SeekIC

As the figure 17-30 shows, the photoelectric conversion element RG uses the photoresistor, when there is the light, it has the low resistance; when there is no light, it has the high resistance or in the open state. IC1 is the comparator circuit, when RG is lighted and has the low resistance, 555 sets, Jwillnotact, LED1 turns off. At night, RG has the high resistance, pin-2 has the high electric potential, because pin-6 connects with VDD, so 555 resets, J closes and LED1 turns on. The action locking loop is composed of the IC2 and VT1，VT2. IC2 is the monostable timing circuit, the timing time td=1.1R7C6, it is about 10 minutes.



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