For the simplest of builds, 7-segment display modules usually get dug up from the parts bin. ... The rest of the build is pretty plain vanilla — an Arduino Nano clone, a DS3231 RTC, ...

“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 ...

The sensors are connected to an Arduino Nano via a 74HC165 parallel-load shift register, ... By combining addressable LEDs, light pipes and 7-segment displays, [TerraG2] ...