So he thought of experimenting with those, and built a ‘Binoctular’ LED clock which uses the Neopixel rings as 7 segment displays. Each digit is made using ... an Arduino Nano clone, a ...

[Lewis] has just the thing for that: a big expandable 7-segment display ... and the project can be built using an Arduino Nano or an ESP8266 for control. The latter opens up possibilities for ...