OpenSprinkler › Forums › Hardware Questions › OpenSprinkler Pi (OSPi) › New to Sprinklers, veteran with Pi › Reply To: New to Sprinklers, veteran with Pi August 17, 2018 at 8:41 pm #51778 RayKeymaster Did you mean the transformer requires a ground wire or it supplies a ground wire? If it has 3 wires, like 2 supply 24VAC, and the third is ground, then you can ignore the ground wire as OpenSprinkler does not need a ground wire.
