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I can imagine there maybe being some IO pins on the inside, so you could unscrew the case, maybe insert a spacer (or swap to a smaller battery), and then a second PCB with whatever extras you wanted in it.
Oooooh! That does sound good, perhaps this could be made compatible with Sensor Watch daughterboards, I'm sure there is some overlap in user bases, and you could take advantage of the open HW framework already in place.
Coincidentally I wear that exact Protrek and it feels like it's for the same reasons! I love the DCF77-disciplined timekeeping and the ability to sense one's surroundings to an extent. I just wish this kind of functionality and form came in a tweakable, open source package.
b3-4r
@user140377
Slightly offtopic today on hn someone wish a watch wishlist:
https://lock.cmpxchg8b.com/watch.html
https://news.ycombinator.com/item?id=33674904