“I’ve built a digital clock made out of 144 seven-segment displays controlled by an Arduino Nano. The segments are controlled by 18 MAX7219 ICs which can control up to 64 individual LEDs or 8 ...

Inside the boxy blue base is an Arduino Nano, a DS3231 real-time clock module, ... We love the way this clock celebrates the seven-segment display, and only wish it were much bigger.

The clock part works as you probably expect — an Elegoo Nano fetches the time from a real-time clock module and displays it on the WS2812B LED strips arranged in 7-segment formations.