When you hear the term “digital watch,” there’s a good chance you picture a Casio F-91W. This iconic timepiece was first made in 1989, and millions of them are still produced each year. On the other hand, this particular model by creator Kothe is like nothing you’ve ever seen. It's expanded to a size that dwarfs the original, and can be hung on the wall with similarly gigantic straps.
The watch runs on a Mega Pro Mini board, which is a sort of unofficial compact Arduino Mega, along with an RTC module for timekeeping duties. Time, date, and alarm status are shown on a 7” Nextion display, concealed behind transparent acrylic that’s bordered by incredibly realistic F-91W labeling.
For interface, the clock features three buttons in the same configuration as the original, but instead of pressing them for activation, each one is touch-sensitive via a TTP223 module. An internal buzzer gives off the characteristic beeping response that you expect out of this type of watch.
It’s a brilliant build, which could be mistaken for the original if you didn't know its scale. Be sure to see it in action in the videos below, first on a white grid next to its “little sibling,” then mounted next to a door with the straps installed.