Which of the following is NOT a listed controller type?

• A. Weather/Soil-Moisture Based Controller
• B. Hybrid Controller
• C. Internet Based Controller
• D. Smartphone-Based Controller

Answer: (D)

Understanding how irrigation controllers are categorized helps explain why some terms aren’t listed as distinct types. The main controller types are those that define the decision logic: weather/soil-moisture-based controllers adjust scheduling based on environmental data or soil sensors, hybrid controllers combine weather data with traditional scheduling, and internet-based controllers use cloud connectivity to manage and optimize irrigation. A Smartphone-Based Controller, on the other hand, is not a separate control strategy—it’s simply a way to access or interact with a controller (often one that already falls under internet-based control). The smartphone is an interface, not a unique method for determining when and how much to water. Since the categories are about how the irrigation logic operates, smartphone-based access isn’t counted as its own listed type.