Hi again. I don't know what country you are doing this in. I'm in the UK and if as it seems you are planning to dim headlights on a car it would be illegal here.
I'm in Canada, and, as far as I know, dimming headlights is illegal here as well. ...at least the way this circuit might allow, that is.
This project's first implementation will be as a turn signal flasher replacement. Entirely unnecessary, but I'm enamored with the idea of emulating the behaviour of incandescents with LEDs. :sunglasses: The Arduino sketch will employ fading effects while turning LEDs on and off to emulate the slow turn-on/off times of incandescents. I also have ideas for combining existing switches to generate other turn signal light flashing effects.
The other possible applications for this project include managing other lights, but that would be strictly for "off-road" use (i.e. leading parades, car shows, etc.)
My passion is driving, and I've been thinking of learning more about electronics for a number of years. This project has finally motivated me to engage in that more fully. :D
PS Your support in this topic has been utterly amazing, NOSUM. It is unlikely I would have made it to the end here without your - and others' - help. I'm now engaging in challenges with this project's power management at Automotive Human switching and power management. I'd be happy to see you and your contributions there. :)