Here’s something that’s a little late to celebrate the fact that all the events in Back to the Future have happened in the past, but that’s what time machines are for, right? [Deater] created Pi-powered time circuits and a flux capacitor. He might not have a DeLorean, but he does have the equipment to turn a DeLorean into a cool car.
The ‘time circuits’ shown on-screen in Back to the Future actually weren’t very complex; the times were just cutouts with lights and gels; no real electronics wizardry necessary. Of course the BttF DeLorean has since been remodeled and refurbished with time circuits that look and act the part, and [Deater]’s time circuits have everything you would expect: a display of the destination, current, and last time, sound effects, numeric keypad, flux capacitor, and a speedometer.
While it doesn’t simulate the time circuits from the movie exactly, that’s not necessarily a bad thing. The movie time circuits were colored gels, and wouldn’t exactly be practical for a Raspberry Pi-based prop. It’s a great build, and one that would look great in either a ’98 Nissan Altima or a DeLorean

https://hackaday.com/2015/11/10/rasp...time-circuits/