I've added support for the Ecowitt WH45 to my fork of the weewx-sdr
extension at
https://github.com/mfraser/weewx-sdr/
This has sensors for temperature, humidity, CO2, 2.5PM & 10.0PM.
Has anyone produced a graph template for the Belchertown skin and are
there any service extensions that will upload the CO2 & PM readings?