This article shows how to use an Arduino Uno/Nano microcontroller with an OLED display module for reading a Type K thermocouple ... The final data output is in a 12-bit resolution, SPI-compatible, ...

So refitting defunct watches has become a hobby for him, and this example is a doozy. It uses an Enigma emulator running on an Arduino ... A small OLED screen peeks through the front bezel ...