I have a student who wants to tie a Photon 2 to a sound meter to detect volume (ideally in decibels). We've found a few posts from 2016, and a more recent mention of a library that works with a microphone, but the former's quite old and the latter doesn't mention volume, just recording. Does anyone have any recommendations?
I don't know of a good solution for this. The recommended microphone for the Photon 2 connects via PDM and uses the Microphone PDM library. This, however, only gets amplitude, not sound pressure level, and isn't particularly accurate, either.
I think you could probably convert the waveform data to DC by doing the root-mean-square algorithm and then do the integration over time in software. You'd still need a way to calibrate it, though.
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