OK, I see. Yes I am aware of the two-wire valve. Unfortunately OpenSprinkler is not designed for two-wire valves. They typically require an encoder on the controller and decoder at each valve. The encoding method is probably proprietary and each manufacturer uses a different encoding method. Also, although the wiring is simpler, the cost of the controller and each decode are considerably higher. So my understanding is that it’s meant for commercial systems with a large number of stations.