A quick look at my 3ft / 0.9m MAX7219 display controlled by the MD_Parola library.
► PCBWay $5 for 10 pieces https://www.pcbway.com

Much more (including the demo sketch) in my GitHub:
https://github.com/RalphBacon/256-MAX...

After 5 years I've started implementing the 3ft (0.9m) MAX7219 LED Matrix into my workshop! No rush! It's not complete yet but the library I'm using has a few nice tricks that are worth sharing, plus some caveats about the wiring of these longer displays.

Hardware
MAX7219 Dot Matrix Module 32x8: available in red, blue and green
https://s.click.aliexpress.com/e/_DeS...

Software
Marco Colli's (MajicDesigns) MD_Paraola library
https://github.com/MajicDesigns/MD_Pa...
If you like and use this library please consider making a small donation using PayPal (see the link in his GitHub page)
(And before you ask, of course I have donated! 👍)

More information (including all links, sketches & PDFs in my GitHub):
https://github.com/RalphBacon/256-MAX...

► List of all my videos
(Special thanks to Michael Kurt Vogel for compiling this)
http://bit.ly/YouTubeVideoList-RalphB...

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My channel, GitHub and blog are here:
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