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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@adjtm
What does 1ATM mean? If you mean swimming underwater up to 10 meters, I don't think so. 1ATM more or less means: With a watch in new condition, it should survive light rain if you don't push the button with a drop of water around it. That's what bangle.js already has. Gluing the barometer hole could help, but even then I would not use it for swimming, bathing, showering, putting it under the tap... By the way, salty water would ruin the charging and programming contacts very rapidly.
Waterproofing is a complex topic. There are some comments and conversations here about it:
https://forum.espruino.com/comments/16734558/
https://forum.espruino.com/conversations/389438/
There is also a crazy guy that probably has the most waterproof bangle.js "mod":
https://forum.espruino.com/conversations/396132/