@Ray, @Samer: The current OWM interface implemented for OpenSprinkler doesn’t use hystorical weather data from the day before. In my opinion this isn’t exactly what will be needed for a working Zimmerman Method. What are the future plans here? There have been forum discussions about using Dark Sky, Netatmo or other weather services. Are there any results or decisions available?
More OpenSprinkler users might run into bigger problems if WUnderground deletes the service for existing API keys?
Please let us know if there are some plans on which way to go in the future.
Regards
Franz