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I don't have one personally but I did some research into their hardware when making a DIY clone a few years ago: https://github.com/shanet/clearair

The EPA published a paper calibrating the sensors PurpleAir uses with their much more expensive sensors and found it was fairly close after applying a correction factor (which I also used in my implementation). https://github.com/shanet/ClearAir/blob/master/docs/PurpleAi...

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Question about your project: can I swap out the Feather M0 for an ESP32 based board like HUZZAH32?

* https://www.adafruit.com/product/3405

I don't see why not as long as the Adafruit libraries I used still work on it (or you swap them out with something else). Overall it's a pretty simple project that just reads values from sensors and prints their values over a TCP socket so I'd imagine getting it to run on a different platform than I used would be fairly straightforward.

Very cool project. Do you run your clone device in any kind of enclosure?

Yes, I keep mine indoors so I made a small wooden box with a cutout on top covered with a piece of window screen material to allow for airflow inside. I figured I'd leave the enclosure as an exercise for the reader since you'd likely have a different preference for it than I did.

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