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Program controlled irrigation system

  • US 5,293,554 A
  • Filed: 08/10/1990
  • Issued: 03/08/1994
  • Est. Priority Date: 08/10/1990
  • Status: Expired due to Fees
First Claim
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1. A multiple program controlled irrigation system which comprises:

  • first means for dispensing an irrigation medium to a first zone in accordance with a first program;

    second means for dispensing the irrigation medium to a second zone in accordance with a second program;

    means for establishing a first start time and a second start time at which dispensing of the irrigation medium may begin;

    drive circuitry for said first and second dispensing means;

    means for selectively assigning the first start time and the second start time in a predetermined combination to first and second portions of said drive circuitry in accordance with the first and second programs for controlling the first dispensing means and/or the second dispensing means to initiate the dispensing of the irrigation medium to the first zone and/or to the second zone in accordance with the assignment of the first and second start times wherein such assignment is referred to as an existing assignment;

    such existing assignment by the assigning means being in any combination including the combination of assigning no start times to one of the first dispensing means and the second dispensing means and assigning both the first start time and the second start time to the other of the first dispensing means and the second dispensing means;

    means for changing either or both of the assignments of the first start time and/or the second start time from one of said portions of said drive circuitry to the other of said portions of said drive circuitry and from the existing assignment to a next assignment for controlling the other of the first dispensing means and the second dispensing means to initiate the dispensing of the irrigation medium to the first zone and/or to the second zone in accordance with the next assignment of the start times; and

    which further comprises means for placing the start times into one of three categories including, (A) assigned to said first dispensing means, (B) assigned to said second dispensing means, and (C) unassigned and available; and

    which further comprises means, responsive to an effort by the changing means, for locating any start times in category (C) and presenting at least one of such start times to the changing means.

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