Abstract: A three button programmable sprinkler control system includes a control module having an LCD display, a decrement button, an increment button, and a set or select button. In a preferred embodiment, the control module is battery powered, sized for hand holding, and conveniently positionable in and removable from a system cabinet having therein a power transformer and base triac board including a base set of zone valve triacs. The system cabinet is sized to receive an expansion board having a second group of triacs for expanding the number of sprinkler valves which can be controlled. The control module includes a processor having stored therein a control program which is menu based and which is accessed for setting irrigation control parameters by operation of the three switches with reference to icons displayed for the various menus. The control module interfaces with the base triac board and an expansion board by a connector.