Modifying a Casio F-Series Digital Watch (2020)
shellzine.nethttps://web.archive.org/web/20210309193244/https://shellzine... There is also https://github.com/joeycastillo/Sensor-Watch This article really doesn’t work without pictures. Also, the web site is stupidly broken and slow. The archive link works https://web.archive.org/web/20210309193244/https://shellzine... Too many requests.
I suspect this article will bump up the monthly hosting bill.