This is great. did you leave out the alarm ringing and the continuous increment when holding the A button because they were hard to model or just to keep the demo simple?
This is funny, I just ordered a FOSS replacement movement for the F91W, which, with a few calibrations spread out over a few months, can achieve an accuracy of <15s/yr (it also has an accelerometer and a thermometer built in). I was planning on writing some astronomy and navigation apps for it
The backlight is integrated into the movement. SWP has a red and a green LED, depending on whatever suits your preference.
It's also compatible with the A158WA-1, which is basically an F91W, but with a steel case (the steel bracelet can be replaced with an 18mm leather strap if you prefer).
I haven't put the SWP in yet, so I can't comment on how good it is, but it looks very promising.
BTW, if you want the high accuracy feature, you have to change some settings and flash a new firmware with nanosec enabled.
If anybody is interested:
https://www.crowdsupply.com/oddly-specific-objects/sensor-wa...
It's also compatible with the A158WA-1, which is basically an F91W, but with a steel case (the steel bracelet can be replaced with an 18mm leather strap if you prefer).
I haven't put the SWP in yet, so I can't comment on how good it is, but it looks very promising.
BTW, if you want the high accuracy feature, you have to change some settings and flash a new firmware with nanosec enabled.