OpenSprinkler › Forums › Hardware Questions › OpenSprinkler Pi (OSPi) › Cannot identify GPIO pins for stations › Reply To: Cannot identify GPIO pins for stations April 26, 2015 at 1:42 am #37119 Dale MarchParticipant You can see in the attached PNG how to use the serial shift register. This diagram is for a 16 ch relay card. just use half for 8 relay card. Dale Attachments:Sprinkler.png
