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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.
@myownself
I've used it on my phone, it works, but I then failed to get jupyter or similar running on my phone to look at it properly.
Exactly as @Mi said: for evaluation recorder files plus similar from another device, for development the raw signal (ideally and accelerometer) are needed.
@Mi I have bought a pulse oximeter for immediate personal needs but will be useful when we work on the SPO2 functionality.