I have manually wired up a 6x8 LED matrix, multiplex style, and I have just begun testing it with a quick little program. I set one column(cathodes) LOW, and looped through the rows(anodes) turning them HIGH one at a time. That worked perfectly, but now I want to start moving horizontally and realized I don't know how to set the columns to OFF.
I know setting them LOW pulls the current and completes a circuit if the corresponding ROW is high, but what do I set the column to if I don't want it to light? As far as I know, you can only do LOW and HIGH, and it seems like HIGH would probably be a bad idea.
I've been searching through the forums and whatever programs I could find for the answer, but I haven't been able to find it. Probably too basic 