OpenSprinkler › Forums › Hardware Questions › OpenSprinkler › 12VDC pond pump control › Reply To: 12VDC pond pump control January 8, 2017 at 3:38 pm #45156 RayKeymaster OK, glad that you figured it out. Yes, the COM on OpenSprinkler DC is positive, and each station port is a MOSFET switch connected to ground (negative).
