pluto

Beautiful write up and project! I remember reading about another Casio retrofit: https://github.com/carrotIndustries/pluto That version did not have wireless comms - they touch on that in the faq.

I really wish I could buy one of these without a billion year waitlist. I really want to make a magnetometer daughter board so I can have a mode which displays my magnetic heading. I love the new colorways casio recently came out with, I had the plain black for years but now I got myself a pink one as well. The only wrist watch worn by both Obama and Osama! EDIT: oh wow, googling this a bit there's a different project for a replacement motherboard that already has a compass! I guess I might as well just build one myself. [0] [0] https://github.com/carrotIndustries/pluto

> Can the ROM be read and flashed back on Casio watches? I doubt that they use any kind of reprogrammable memory, but you can swap out the entire board like I did: https://github.com/carrotIndustries/pluto

I've built one of these. Good fun, but of course battery life does not match the 7+ years of the original. I think mine lasted close to a year? If I remember correctly the magnetometer was end of life, but not critial to it's operation. I'm not the original author, but I am considering ordering a few new boards and maybe the components. If you're really interested, give a shout on github: https://github.com/carrotIndustries/pluto/issues/1

It's also a good basis for a DIY digital watch: https://github.com/carrotIndustries/pluto

Here's another F-91W mod: https://github.com/carrotIndustries/pluto

God bless Richard Stallman for open source and GitHub for making sharing it easy https://github.com/carrotIndustries/pluto/blob/master/README...

See also https://github.com/carrotIndustries/pluto , a replacement board for the ubiquitous Casio F-91W, also using a TI microcontroller.

DIY? Found this: https://github.com/carrotIndustries/pluto But they've made different design decision: Q: Why is there no accelerometer? A: Accelerometers are the most useful when they're permanently active for applications like sleep trackers, pedometers or features like "shake to do something". Unfortunately, even accelerometers marketed as "ultralow power" draw approx 30 µA when running, draining the CR2016 coin cell in less than half a year. So we decided to dedicate the available space to a digital compass.