[atbukc]

I have my AQM up and running with a Display, MH-Z19B SDS011 and SHT31 temp sensor.

I have tested the SDS011 with the manufacturers software and the USB to COM port adaptor that came with it and it works fine, so I know the sensor is ok.

I assume that I need to wire it up as follows.

AQM     SDS011
SET      TXD
TX        RXD
GND     GND
5V        5V

Hello Andy,

I don't have SDS011, but I'd try to switch the wires TX and SET ...
Good luck!

Perfect, all working fine now..

Thanks Andy.