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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.
user129232
It's just ambient.
The Bangle.js 2 sensor can handle Blood Pressure - hopefully I'll be able to expose that eventually (if not right at the start), but if you can find a Bluetooth SpO2 sensor you can totally interface to that on the Bangle and save the data from it.
While it's often painful to physically connect a sensor, it's very easy to connect via Bluetooth LE, so you can either find things off the shelf, or could even make something with for instance a Bluetooth module like http://www.espruino.com/MDBT42Q