Sunlight timer circuit schematic

Photocoupler

As shown in the figure, the daylighting timer circuit uses 555 as the timing oscillator, and uses the counter to record the number of oscillations, while the 555 oscillates or not. It is controlled by the daylight detector-silicon photocell 2CR21, and when the five sunlight is illuminated 2CR21. Turning on 3DG6 puts 555 in an oscillating reset state. When there is 2CR21 sunlight, an electromotive force is generated on it to make 3DG6 reverse biased off, so 555 oscillates, the oscillation period is set to 6min, 555 drives relay J to move, no 6 minutes to pick up, the counter records the number of times J sucks. Down, the cumulative result gives the total number of sunshine hours.