Charlieplex displays use a unique wiring structure so many LEDs can be controlled with just a few shared wires. There are even specialized driver chips like the IS31FL3731 which can control a large number of Charlieplexed LEDs using pulse-width modulation to dim and brighten them at different intensity levels. Adafruit's Charlieplex FeatherWing and breakout use this driver chip to make a large matrix of tiny LEDs that are super easy to control. Using a CircuitPython or MicroPython IS31FL3731 module you can even control Charlieplex matrices from Python code! This guide explores how to use the Charlieplex FeatherWing and breakout with CircuitPython.
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