OpenSprinkler › Forums › Hardware Questions › OpenSprinkler Pi (OSPi) › Relay blinks › Reply To: Relay blinks December 22, 2015 at 11:32 pm #41072 RayKeymaster Can you explain why the relay needs to be set as normally closed? The OpenSprinkler firmware assumes active high logic (i.e. the shift register outputs high when a station is to be activated).
