[Magnus] pairs the off-the-shelf capacitive sensor with an ESP32 charged with reading it and reporting back to Home Assistant. It’s also outfitted with a heater to keep it at a constant ...

If there was no water on the windshield, all the light reflected back to the sensor and all was good. No need for the wipers. If there was rain on the windshield, less light would be bounced back ...

If the sensor sees less return light, it turns on the wipers ... Some Tesla vehicles can use their cameras to passively detect rain. Also, if you don’t need to sense the glass, it is pretty ...