Hi
I need to address individually like about 400 Led individually and in random at choice, for which I have made a matrix and multiplexing them as in sourcing the 20 columns and sinking the 20 rows.
Please advise which combo would be best?
Like turning the LED,s on one at a time, from what I'm reading it seems it may rather be charlieplexing than multiplexing?
Actually they will be Optocouplers but same thing I guess?