want: automatic windshield wiper / defogger / defroster. detect rain via moisture sensor or via semiconductor laser (IR?) through windshield glass, using an incidence angle where total internal refraction (TIR) works when the interface is glass-air, but not (or not as well) when the interface is glass-water, and thus trigger windshield wiper activation / control wiper frequency. external temperature sensors are common and can trigger defroster/defogger, though maybe internal humidity sensing is also needed.

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