May 01

# Charlieplexing LEDs to control a lot of LEDs with a few pins

Ever wanted to control a bunch of LEDs and minimize the number of pins used without using something like an LED strip or LEDs that have processors so that you can address them using $I^{2}C$ or some other protocol? Well then, meet Charlieplexing and a handy tutorial all about how a clever use of pins can turn on lots of LEDs with clever use of the diode part of the LED.