Use M5232L to make light-controlled automatic warning lights

VD1, VD2, C2, C3, etc. form a simple capacitor step-down half-wave rectifier and voltage stabilizing circuit, which outputs about 12V DC voltage
to power the entire circuit. RG is a photoresistor, which has low resistance when exposed to light during the day, so the input
voltage of pin 7 of M5232L is higher than the 1.31V reference voltage inside the integrated block oscillator stops, pin 3 is low level, and the thyristor vs is
in the off state and the light H does not light up. When night comes, the RG has high resistance when exposed to no light, and the voltage of pin 7 of the integrated block
below 1.31V, the internal oscillator starts to vibrate, and pin 3 outputs a square wave pulse to open and close the thyristor vs. gap. ,
so the lamp H shines brightly. The flashing frequency of the lamp is determined by the external capacitor C1 connected to pin 5. The data shown in the figure shows that the flashing frequency is about 1.8Hz.
Adjusting the potentiometer RP can change the light control sensitivity so that the warning light lights up when needed.