These are 2 sets wired in reverse polarity across the same 2 feed wires
- each alternate LED is on one of the 2 polarities, so they get effects without extra supply wires.
The stock controller is boring, the son said "hey can we do a Pi" and thus it began... The project is simple once we get the driver stage done
- and a great example of PWM control (more fun as we need to run two phased locked PWM channels - we may try bit banging with a high priority process just for a laugh (on a non RTOS like linux, that may itself demonstrate valuable education if it occasionally doesn't work right), but I've seen a library that claims to be able to do phase locked PWM on a Pi nicely.