A simple demonstration of charlieplexing: 12 LEDs are individually lit over 4 wires.
Charlieplexing extends the limitation of I/O pins of a controller beyond its capability.
Christmas tree decoration
For the winter holidays of 2025 I create 5 types of Christmas decorations that can be used as earrings, pendant or Christmas tree decoration
Whenever you are in danger of running out of pins to drive all your LEDs this is a way to solve the problem.
