OpenSprinkler › Forums › Hardware Questions › OpenSprinkler Pi (OSPi) › Water pump is shared between pool and sprinklers – manual pool filling? › Reply To: Water pump is shared between pool and sprinklers – manual pool filling?
If I understand it correctly, I think what you need is a pump start relay. A pump start relay (specifically, the coil pins) can be wired to OpenSprinkler like a normal sprinkler station. Then the contact pins can be wired to high voltage device, such as pump and 220V. If you search for pump start relay you should be able to find plenty of options.