Rain bird controllers used to control automatic watering systems from drip irrigation systemsor pop up lawn sprinklers. These are smart systems which can control the flow of water, controlling the duration and frequency means your plants are well looked after and ensure proper growth and development.Rain Sensorscan be used in conjunction with an irrigation controller to enhance its capabilities. A rain sensor detects the rain fall periods and then suspends the water flow from your water supply, this stops water be wasted.