OpenSprinkler Forums Comments, Suggestions, Requests driving motorized ball valves Reply To: driving motorized ball valves



Regarding the 3-wire type: DC Latch version cannot directly operate it — if you use DC Latch version, it should work with the 2-wire reverse polarity type, with some minor modifications of the firmware. Instead, 3-wire type has a common cathode, and two anodes one for opening the valve, one for closing the valve. So it can work with the OS DC version, with a slight hardware modification. Specifically, OS DC uses common anode (the common wire is the positive), and each zone is a cathode switched by the control signal. This logic needs to be flipped via a transistor per zone so that each zone becomes a switched anode. This way, a 3-wire motorized ball valve will take over 2 zones, one for opening it, one for closing it.