When there is no rain, it has a high resistance with the circuit "ground" line; when it is rainy. The base current of VT1 increases, the ce junction resistance becomes smaller, 555 and R1, Rce form a multi-vibrator with a very low frequency. When it is heavy, the probe is in full contact with "ground". The ce junction resistance is smaller, so the oscillation frequency is higher. The orthogonal square wave output of the 3-pin output drives VT2 and VT3 to make the wiper motor run at full speed, which drives the wiper to swing. Brush off the rain on the windshield.
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