![]() This is when I discovered the world of the BMW I/K-Bus. It turns out the Rain/Light Sensor is connected to the cars’ internal serial communications bus. It’s purpose is to:ġ) Detect rain on the windshield to automatically turn on the wipers and set a proper wiper speedĢ) Detect ambient lighting to control automatic headlight operation The Rain/Light Sensor is mounted on on the top center of the windshield. Instead of simply using a photo-resistor to solve this issue, I decided I wanted to use the already available light sensor in the car. The LED was the perfect brightness during day time, but was a ridiculously bright eye sore in the night time. The wiring kit includes an alert LED which flashes whenever the radar detector picks up a police radar band. I have a hard-wired radar detector in my E46 BMW – an Escort Redline. This project was born because I chose to do a simple task the hard way. *** Project: Arduino & BMW K/I-Bus Interface ***
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