MAX7219 https://hackaday.io/project/28592-holiday-8-bit-2-led-ornament/log/71715-the-max7219-led-matrix-kit-assembled 8 x 8 LED array driven by max7219 on the Raspberry Pi via python 8×8 LED Matrix MAX7219 Tutorial with Scrolling Text & Android Control via Bluetooth Driving an 8×8 (64) LED Matrix with MAX7219 (or MAX7221) and Arduino Uno One of my own just soldered
