fu-hsi

> > > As noted by adafruit (https://cdn-learn.adafruit.com/downloads/pdf/pm25-air-quality-sensor.pdf , pg.13) there is a delay in the refresh rate abound 2.3 seconds max when there is no change in the particle...

Hi. What does not work? Paste error.

I don't have Uno or Mega, but library is compatible with Arduino. It's nice to see all your code and circuit.

Yes, but without circuit I don't know what pins you are using. I don't have this board and I see that many UART ports is available. Just check wiring, try...

> I can not find any pin definition. You are right, my mistake. I mean Serial, Serial1, Serial2... But when you use SoftwareSerial, you can choose any pins.

@Just-ice-E you can't block main loop like these: > // Wait a few seconds between measurements. > delay(2000); Please use examples provided with library. You can also use passive mode...