As shown in the figure, the middle is a 555 timer. According to the timer principle, the timer will be triggered as long as the voltage at the trigger pin 2 is lower than 1/3Vcc. According to this principle, the car wiper is equipped with a detector between the 2 pin of the 555 and the ground wire as shown. In the figure, S1 can forcibly control the switch of the whole circuit. When S1 is off, the circuit is normally disconnected, but if it encounters rain, the detector will be short-circuited. At this time, the 2 pin is connected to the ground. The voltage of the 2 pin is 0, less than 1/3Vcc, the timer is triggered, the output voltage 3 feet point becomes high, the LED light is illuminated, T1 is turned on, the relay RL1 is turned on, and the wiper is turned on. The motor, the wiper starts working. On the contrary, after the rain stops, the 2 feet are disconnected from the ground, the 2 feet are restored to the high position, and the wiper automatically stops. Therefore, the smaller the detector spacing, the more sensitive the wiper.
Automatic control circuit for automobile wiper
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