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Just as a hint:
To do that you probably need a reference breath signal. Some here are using the polar H10 chest belt which has an accellerometer build in (so probably much directer acces to breathing than PPG). This signal is sent via BTLE (I do get it here on Linux with a python program).
And there is the "HRM Accelerometer event recorder" which right now stores raw PPG, HR and RR from H10, acc from bangle. Should be not too hard to add Acc from H10 here with which you would then collect all the data you probably will need on the way trying to get breathing from PPG.
Mi
Yeah I think I'll try that.
What's the difference between the VC31 and VC31B? Are they both available?