I’ve just received a big shipment of the PiicoDev RGB modules, and I can confirm that it was indeed just the one board that was dodgy, my random sampling of the other boards confirms they all perform beautifully, well done to the Core Electronics team.
I did discover that I’m better off setting the brightness only once as a “max value”, and then scaling the RGB values down from that for effect. Using the brightness register alone (after setting the colour) results in pixel 0 drifting “off colour” consistently in all the boards I tested. This indicate that the behaviour is either by design, or a gap in my (limited) understanding of the board so I’ll just wait for more documentation to come out and investigate again later.
