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.

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