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adafruit / Adafruit_CircuitPython_PM25

CircuitPython library for PM2.5 sensors
MIT License
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Add explanation of "standard" and "environmental" sensor values to docs #23

Closed psoberoi closed 1 year ago

psoberoi commented 2 years ago

The library returns two sets of concentrations: "standard" and "environmental" but the docs don't explain the difference between them. After some searching, I figured out that "standard" refers to what the concentration would be at standard pressure (i.e. sea level) whereas "environmental" refers to measured values that depend on ambient pressure. It would be nice to add this info to the docs.

(There's a discussion about this here: https://publiclab.org/questions/samr/04-07-2019/how-to-interpret-pms5003-sensor-values)

ladyada commented 2 years ago

ooh thats useful info! @kattni plz add to learnguide / readme :)

kattni commented 1 year ago

Added to Learn guide: https://learn.adafruit.com/pm25-air-quality-sensor/usage-notes#standard-vs-environmental-concentration-3140491