I am using a well water collection tank (5,000 gallons) for my irrigation water, and want to pause the RM when the tank is empty. I used my RM (HD12) hardware rain sensor inputs connected to my well tank empty float to do this. You can select normally open or normally closed swith inputs at the RM. The RM software also allows you to select various pause durations before enabling the RM again. Note, it will not resume an existing program that was paused, but will start the next scheduled program following the pause.