I am trying to develop a piston that can do the following, but have not been successful.
I want to activate a re-circulation pump on and off for 15 minute intervals (on for 15, off for 15, on for 15, off for 15, etc) when at least one of two people is present. I want to piston to turn the pump off when no one is present and during the night (say 12AM - 7:30 AM).
I can get all by the 15 minute intervals just using Smart lighting in Smartthings.