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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.
@b3-4r
Turns out there are waterproof baro sensors, e.g. (first hits) BM1390GLV or LPS33HW ..
The sensor could be installed in a separate open cavity with a flat flex passing into the main sealed cavity either through a potted section or between soft gaskets.