What is the function of a controller in an irrigation system?

The function of a controller in an irrigation system is to signal automatic valves to open or close. This is a crucial role because the controller acts as the brain of the irrigation system, regulating the delivery of water based on various factors including time scheduled for watering, duration of watering, and specific zones that might require different amounts of water. By controlling the automatic valves, the controller ensures that water is distributed efficiently and effectively, responding to preset programs or environmental inputs, thus optimizing water use and meeting the needs of the plants being irrigated.

Other choices touch on important aspects of irrigation but do not describe the primary role of the controller. Controlling water pressure is typically managed by pressure regulators or the design of the system. Measuring water usage often involves flow meters, which may or may not be connected to the controller, depending on the system design. Determining the type of plants is part of the planning and design phase of the irrigation system rather than a function of the controller.