[ok2arm]

From the log, it seems that the CO2 sensor is being read correctly.
After some minutes, the TX Led should turn off and then the dust sensor will be read. Keep monitoring the Serial Monitor, you should see the PM readings too.
Make sure the Temp/ Hum sensor is also installed, it is required.

Hi Werk,
problem was be on the output from CO2sensor, I found crack way on pcb, near output pin... Because was be read ok and sometimes not...

Well

And last problem is in RX unit, RX dont roll bettwen PM2,5 and PM10 as WD... Can you ask me, whitch part SW is for changing 2,5/10 ? On the LCD is just 2,5
Tnx