Unicorn HAT + GPIO cable

using jumper cables alone, this would work:

you need 5v from pin 2 (or 4), ground from pin 9, and PWM from pin 12 (BCM18).

… when you get your cables I think you’ll see the problem, namely that the jumper cables sitting in the HAT are too loose to be secured in position long term.

I’ll try to post a possible permanent solution over the weekend if you’re not afraid to get your soldering iron out!