Recommended · for beginners
How to Multiplex an LED Grid...
Why people recommend it
An explanation of multiplexing LEDs in rows and columns to save pins, linked for both plain and RGB LEDs and for how the diodes keep unwanted ones dark.
Watch for: RGB LEDs come in at about 3:45
In their words
How to Multiplex an LED Grid... (YouTube)
Majenko on arduino.stackexchange.com, Aug 2015. CC BY-SA.
