[engolling]

Concerning the davis emulation using the Input of an "extra sensor" is OK because you can measure up to 255cm snow height.

I'm afraid that's not so linear. The Extra Sensors data field is of 1 byte, but there is an fixed offset of 90ºF, to allow representing negative temperatures. So, for 0º F, the byte should have a value of 90º F. Consult the Davis Vantage Serial Protocol documentation.

Being very honest, adding any type of sensor to the Davis Emulation, that isn't a Temp / Hum sensor (extra sensors are designed for Temp / Hum sensors)  its a nighmare, and always will have serious problems or limitations, per example, units will always be shown as ºC ou ºF, in Cumulus or any other software.

I'm aware of this problem, that's why I read it as extra humidity.
Moreover as I already said, I'm using a second UART to save all the raw data. The davis emulation is only for the online display.
I'm planing here some online database to save all raw values. They should be read with a python script and than displayed with highcharts.

I have a lot of ideas... thats why I want to change to weatherduino to get rid of the basic hardware and software stuff. At the moment I have a hand welded prototype and I stopped at routing the pcb. When changing I want to have more time for sensor development and programming a nice frontend.


I'm still interested in making the laser snow depth measurement popular. So if there are enough contributors I would order the ranging pcbs from the supplier.