Hi Rüdiger,
thx for your review.
I think the value “Hours since last rain” is a good basis for an irrigation flow. And if the “Soil and Moisture” sensors are added, it will be a good monitoring. I have 4 “Soil and Moisture” sensors in use myself and am very satisfied.
When you have installed the weather station at the Thyssen Krupp aluminum tube 
and collected a few weeks of experience, maybe you could do a product review in the German-speaking forum in the thread Hot oder Schrott if you feel like it? Just a suggestion.
@Adrian_Rockall, would it be possible to implement weather forecast data as well? Does Ecowitt provide such data?
