Hello, I’m doing a project with multiple one meter strips of neopixels and prototyping with two strips to get the wiring correct before I scale up to six or seven. I’m powering each strip separately with a 12v battery pack and running it with a Nano Every, powered with its own 9v.
I read that all the grounds for the LED strips should be connected so I have both battery pack grounds tied together with connections to the ground lead on each strip. The 12v lead from each pack goes directly to the strip it powers.
I have the data signal from my Nano going into the data lead on my strip and then connecting to the next strip. The ground for a pot I have connected to the arduino along with the second ground connection on the arduino is tied into the common ground on the battery packs. I thought that would work, but it does not. I’m guessing I need to separate the grounds and tie the data line back to the arduino’s ground, but I’m not sure. It seems like it shouldn’t matter since all grounds are connected.
I’ve run several projects with the code I’m using, but they’ve all been driving just a few neopixels powered directly from the board. This is the first time I’ve powered one this way. Also first time I’ve connected capacitors across the + and - leads of a strip. Maybe that’s it?