As shown in the figure, the controller has 555 as the core, and the photosensitive tube (3DU type), RP constitutes the RS flip-flop circuit. At night, the resistance between the ce poles of the 3DU tube is extremely high, the 2 feet are close to the ground potential, the 555 is set, the 3 feet are at a high level, and the lamp is lit; during the daytime, due to the illumination, the resistance between the 3DU tube and the ce pole is reduced, 6 feet The voltage exceeds the threshold level 2/3 VDD, 555 resets, and the light is off.
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