Electronics4you
Member
I have found this circuit for charlieplexing 20 LEDs with 5 microcontroller pins. If you put 5V on the upper connection and GND to the next, what would the other ones then have to be in order to not lit up the other LEDs? I can't figure that out...
https://www.electro-tech-online.com/custompdfs/2007/05/dev1.pdf
https://www.electro-tech-online.com/custompdfs/2007/05/dev1.pdf