Unknown data SDS011 Serial pariculate matter

[auka (Aurélien Kairet)]

Hi Everybody. I’m new in the home assistant community. I already Set many things in my home assistant but I have an issue with my SDS011

I followed this

Serial Particulate Matter

But I haven’t any data
I have “Unknown” in stead of the amount

The code I used

sensor:
  - platform: serial_pm
    serial_device: /dev/ttyUSB0
    name: Nova
    brand: novafitness,sds011

Thx for your help

[MPI2 (Hans)]

Push.

Any advice?