Patent ID: 7792612

Claim:
An expandable irrigation controller for controlling a plurality of watering stations in an irrigation system comprises: a removable front panel, the removable front panel comprising: a plurality of manual controls operable to input instructions for a watering program; a memory operable to store the input instructions; and a controller operable to execute the watering program; and an inner housing, connected to the front panel, the inner housing comprising: a circuit board connected electrically to the controller, wherein the circuit board includes two electrical conductors extending across the inner housing, wherein control information from the controller is encoded for transmission on the two electrical conductors; and a station module operable to provide an ON/OFF signal to at least one watering station of the irrigation system, wherein the station module is electrically connected to the two electrical conductors and the ON/OFF signal is provided based on the control information from the controller in accordance with the watering program, and wherein the station module connects to the two electrical conductors at substantially any desired location along the conductors.