Moisture sensor for windshield wipers. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Automobile. Electronic devices
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Figure 1 shows a diagram of a humidity sensor for windshield wipers. When water drops hit the humidity sensors E1 and E2, the resistance between the plates changes, which leads to the start of the generator assembled on the DDL chip.
The signal from the generator is fed to a transistor switch that controls the wiper motor.
Fig. 1
The frequency of the windscreen wipers depends on the humidity of the windshield of the car, the more intense the rain, the less resistance between the sensors and the greater the frequency of the pulses generated by the generator.
The humidity sensor is two aluminum foil plates glued to the glass in this way; so that the windshield wipers wipe the water between them.
Resistors R1 and R2 can be used to adjust the intensity of the wipers. The dimensions and distance between the plates are selected experimentally.
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