Giving some additional thought to this, I wonder if you are over-complicating things. How about something like “How is does your grass look?” Too dry? Just right? Too wet? Then a button could adjust the calculator accordingly. The more advanced option could have all the settings you currently expose.
Part of the elegance of the Rachio product is in the simplicity. The ins-and-outs should be hidden unless a power user wants to manipulate them.