Media Maker's Lab | Air Quality Sensor[ Projects ] [ Workshop Resources ] [ Workshop Photos ] [ theoryofpaul.net homepage ] This project utilized an Adafruit Adafruit PMSA003I Air Quality Breakout, a Raspberry Pi Pico, and a switch and an LED. The Pico was powered by a small external USB battery (the type used to charge phones). 
The python script writes ASCII files to the Pico's build-in flash storage every second. They are in a "list" format that makes them really easy to read in Max/MSP using the [text] object. In the future it might be nice to save space by writing in binary, but then some conversion might have to take place in order to read each line sequentially in Max. 
I modeled and printed a sturdy enclosure that could be strapped to my backpack. It's fun to ride around the city with my GoPro camera on my helmet, and compare what the air quality is like in different places at different times! Sometimes it's nice just to put the unit outside for a couple of hours and see what's going on... 
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