Charlieplexing - 10 LEDs from 4 pins including homebrew pcb
Channel: Uwe Zimmermann
Date: 2022-04-26

In a project for Uppsala University we want to have a charge indicator. The module consists of 10 individual LEDs, but instead of wasting 10 GPIO-pins on this task, here I show how we can use Charlieplexing and reduce the number of pins to just four.

I'll also go briefly through my procedure on making y own circuit boards using the toner transfer process.

This video is related to my previous video on Charlieplexing https://youtu.be/h2aJxNj8B6A 
Also there is my previous video on how to use PlatformIO without the Arduino framework: https://youtu.be/BKO1rYMPF_k