maybe adding 12 groups of vias, even though there are 11 charlieplexed groups will make it easier to route around the hour LEDs? this PCB is starting to look like a @welshpixie mandala
#Kicad friends: is there a way to request tented vias on only one side? I'd like the spiral to be shiny on the top and covered on the bottom
thanks to a suggestion from @marble and the power of python, there are now a gross number of small circles in the F.Mask layer to un-tent the vias on only one side of the board.
@th this is so cool, and now I'm imagining it with white LEDs and a tinted acrylic cover 🤔
@pixls I made a white version of the single-color design, but the problem is that the forward voltage on the LEDs is too high, so once the battery drops below 3V it stops working. This means a few weeks instead of a several months of runtime with the red/yellow LEDs that can go down to 1.9V.
@federico3 @pixls many of my watches are 24-hour, although the observation was that nine charlieplexed IO lines could drive 9*(9-2) = 72 = 60 + 12 LEDs. For the bicolor ones 12 IO lines can drive 12*(12-1) = 132 = 60 + 60 + 12 LEDs. There weren't any values that provided nice 24-hour dial combinations.