So he thought of experimenting with those, and built a ‘Binoctular’ LED clock which uses the Neopixel rings as 7 segment displays ... plain vanilla — an Arduino Nano clone, a DS3231 ...

Inspired by a prank tweet, [Sam Ettinger] endeavored to create an SMD seven-segment display. The NanoRaptor ... Each of the seven segments is a single 0201 LED. Six I/O lines and three ...