Core can certainly handle the software side.
CoRE (now WebCore) is a very powerful community – created rules engine for SmartThings. It allows you to set up stacked conditionals like “If A then B but only while C and not if D.”
Setting it up can be quite complex, but there are many community members who will be glad to help you.
For example, here is a piston that one member created to notify him if the dog had already been fed twice that day and he picked up the dog bowl for a third time. He needed this because he has a large family and people didn’t always remember whose turn it was to feed the dog.
As for devices, what are the operating specs? Functional temperature range, distance from the main house, degree of Precision for the reporting requirements, humidity range in the greenhouse, and is it clear glass, blue tinted glass, or something else for the walls?
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