(WIP) A custom motion for the Casio F-91W wrist watch.
While the Casio F-91W is a legendary watch, it doesn't keep time all that well. Whilst it does boast an impressive 7 year battery life, Casio rates it's accuracy at ±30 seconds time drift per month. This project aims to design a replacement PCB for the F-91W which is programmable and temperature compensated, whilst still retaining a reasonable battery life.
The key goals are:
- < ±10 seconds of time drift per year
- > 1 year battery life on a CR2016
Resources and other works which I have referenced for this project