Patent ID: 7421317
Filing Date: 2008-09-02
Classification: A01G,Y10T

Abstract:
1. A two-wire controlling and monitoring system for irrigation of localized areas of soil, the system comprising: a water pipeline providing water to said localized areas of soil: a plurality of controllable irrigation valves each positioned at a specific area of said localized areas of soil, communicating with said water pipeline, providing watering of said specific area controlled by said controlling and monitoring system and having a pair of valve control inputs; a plurality of localized irrigation control units each comprising a line decoder having a pair of valve control outputs connected to said pair of valve control inputs of a specific controllable irrigation valve of said first plurality of controllable irrigation valves for providing valve control signals to said first plurality of controllable irrigation valves, said line decoders further each having a pair of control and power supply inputs: a controller and power supply unit having a set of schedules of instructions and having a pair of control and power outputs supplying power by applying a first alternating DC voltage signal defining a maximum voltage first pulse having a first pulse width and defining a minimum voltage second pulse having a second pulse width to one of said pair of control and power outputs, simultaneously applying a second alternating DC voltage signal similarly shaped but of inverted polarity as compared to said first alternating DC voltage signal to another of said pair of control and power outputs and applying an alternating DC current defining a maximum current third pulse having a third pulse width and defining a minimum current fourth pulse having a fourth pulse width to said pair of control and power outputs; a two-wire cable interconnecting said controller and power supply unit and said plurality of localized irrigation control units and connecting said pair of control and power outputs of said controller and power supply unit to said control and power supply inputs of said line decoders of said plurality of localized irrigation control units and providing said power from said controller and power supply unit to each of said plurality of localized irrigation control units; said controller and power supply unit transmitting said schedules of instructions to said plurality of localized irrigation control units through said two-wire cable and receiving said specific irrigation parameters from said plurality of localized irrigation control units through said two-wire cable; and a specific line decoder being the intentional receiver of a specific schedule of instructions responding by transmitting an acknowledgement signal to said controller and power supply unit through said two-wire cable within a first time frame of said first pulse if said specific schedule of instructions is correctly received or, alternatively, transmitting a not-acknowledgement signal to said controller and power supply unit through said two-wire cable within a second time frame of said first pulse if said specific schedule of instructions is not correctly received.