Spent all night working on this so I can show my son how digital displays work. I explained how the led matrix works and how it makes graphics using 256 dots (8×32). I then explained that it’s the exact same concept that powers an iPhone’s display but that has 2 million more dots. 10 year old mind blown.

LED Matrix MAX7219 + Adafruit Feather 32u4 Bluefruit LE Bluetooth