Programmable controller apparatus for irrigation systems

A programmable controller apparatus and method for irrigation systems including at least one removable control module interfacing with internal circuitry of the programmable controller for activating and operating a plurality of watering valves. A housing unit is provided for the control module and the internal control circuitry of the programmable controller to prevent water contamination and unauthorized tampering. The removable control module interfaces with the internal circuitry of the controller to provide variations in programmable watering sequences for individual watering stations. The control module, in addition, comprises multiple programming keys and switches that provide interaction between the electronic programming and manual programming features which function in combination to provide easier programming options for the irrigation controller. Moreover, the stand alone capacity of the removable control module allows the control module to be programmed at a remote location from the irrigation controller. A manual mode of operation is provided for selectively overriding or deactivating previously entered programming sequences for individual watering stations without disturbing the programming sequences of other watering stations. A master valve is also included which can be selectively activated on a programmable basis for individual watering stations. Formed on the exterior of the housing unit of the programmable controller is an external default indicator that provides visual indication of faulty watering stations. Further thereto, a transmitter/receiver provides the programmable controller with radio compatible for on-site programming of faulty watering stations of the irrigation system.