[Lewis] has just the thing for that: a big expandable 7-segment display. The build is modular, allowing it to be extended from 2 to 10 digits ... can be built using an Arduino Nano or an ESP8266 ...

His clever solution is to use an Arduino Uno R4 and take advantage of the onboard DAC. To turn on a segment ... displays with SMD stencils before, and figured out how to send custom fonts to 16×2 ...