An irrigation controller is an essential tool for applying water efficiently and at the right time. Controllers have evolved from mechanical timers to complex computer-based systems that can accurately control water, energy, and chemicals in response to environmental changes. There are two main types of controllers: open loop systems that apply preset actions, and closed loop systems that use feedback from sensors to make decisions and apply them to the irrigation system.

1. Irrigation System Controllers

14. Closed loop system

25. Hardware Components

28. Discrete / Continuous sensors

34. A/D interface