I am now on to handling the dimmer control within the car which is described as pulse modulation.
Basically, it switches the 12V on and off very quickly to control how bright the dash LEDs are. I need to measure this speed so that I can detect the 5 or 6 rates/frequencies that are in use and translate them into a brightness setting on the screen.
Is this handled by the frequency board?
Can it be done and how?