hi why the led bar don`t run under 5Vdc?
my code works under 3,3v but under 5v the bar don`t run
in doc is written power from 3,3 to 5 Vdc
I have a few of them and they work for me on both 3.3 and 5.
Have you tried removing all other components and testing it in isolation?
Are you using a stable power source? Batteries, Solar, USB, etc?