Yes I could use 2 separate anode lines from the USB board but I would have to add another board for a total of 5 (max) and reprogram. It seems like a waste since the displays are always on, either green or red.
In that case we could add a transistor invertor for the colour select, leaving pins 8/11 on the ULN free for for the dp.
If I used a SPDT solid state relay for anodes like I mentioned that use 1.2v to control, how could I convert the 5v line from the USB board to 1.2v?
hi,
Can you post the part number for the SSR so that I can check it.?