LED matrix cube project showcases customizable images using Raspberry Pi. Tutorial suggests costly Adafruit parts, but cheaper alternatives are available from AliExpress.

In this case, the recipe simply calls for three MAX7219 dot matrix LED modules and a Raspberry Pi Pico, although you could swap that out for your favorite microcontroller if you wish.

• Uses the IS31FL3731 LED matrix driver chip • Scroll pHAT HD pinout • Compatible with Raspberry Pi 3, 2, B+, A+, Zero, and Zero W • Python library • Female header requires soldering ...

The HAT connects your Raspberry Pi to the matrix panel and retails for around $15. Last but certainly not least, you'll need an appropriate power supply to give your sign life.