Hi, when I use the Arduino IDE to flash the 3.1.21 “snap” version of the firmware onto the unit, it gives higher PM readings than the over-the-air 3.1.21 firmware version. This is even if I make no adjustments to the version found in the Arduino library.
The PM 1, 2.5, and 10 readings surged when I used the Arduino “snap” version, with the 2.5 going from 0.0 indoors to 1-3 ug consistently. And the PM 0.3 count, while usually very low or none, consistently hover around 1,000 when using the “snap” version.
Are different firmware versions supposed to be able to change the PM readings like this? And are there differences in the version received over the air vs the one found in the Arduino library? Thank you.