LED matrix control using arrays and state machine?

[topdesign]

@Paul_B

@topdesign

To prevent any wiring changes required in the car, Id like to make this work so that it finishes any animation sequence before returning to "off" mode

That is an obvious contradiction.

Once you lose power from either the turn signal or brake (or whatever), you clearly cannot complete a sequence unless you have a separate, non-switched power source, and such a power source is not available unless you add the necessary wiring to the car.

Well of course you'll need a switched power and a chassis ground
The point it to not have to mess with the factory turn signal relay / wiring... things that would be more complicated for the average person. My personal car this is going on (1975 Porsche 911) is completely rewired by me with aftermarket engine management and a turbocharger etc so I don't care personally lol