ET is only riht way for automatic irrigation for me. I live near Black Sea. In my arrea we have very short ligh or storm rains and near immpossible to peredict rain forecast. Auto rain delay wont work. Hydminity is average 70%-80% so Zimmermann not return adequate to watering needed results. I run OpenSprinkler in manual mode with rain sensor. ShawnHarte thank you for solution. Can you update UI? Hope that method will be implemented is official firmware and UI.