OpenSprinkler › Forums › OpenSprinkler Unified Firmware › Custom solution for greater than 56 stations › Reply To: Custom solution for greater than 56 stations May 23, 2018 at 10:06 pm #50181 RayKeymaster Because the main controller has 8 zones, and each expander has 16 zones. With four expanders, the total is 8+64=72 zones.
