OpenSprinkler › Forums › Hardware Questions › OpenSprinkler › What hardware do I need to purchase for RPI3 lawn irrigation system › Reply To: What hardware do I need to purchase for RPI3 lawn irrigation system June 28, 2016 at 12:46 am #43221 RayKeymaster What you need is a main controller (8 zones) plus two expansion boards (each adding 16 zones). So in total this can control 40 zones.
