Felix and I built the brain of an aquaponics system. It is an outlet box with four outlets each of which is controlled by google calendar. It turns out that this Google calendar controlled outlet box has plenty of other applications beyond aquaponics.
Check out our video:
Check out our Instructable:
https://www.instructables.com/id/Arduino-Outlet-Box-Control-Center-With-Google-Cale
Below is the foregone aquaponics system: