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Fluid control system and controller and moisture sensor therefor

  • US 4,114,647 A
  • Filed: 03/01/1976
  • Issued: 09/19/1978
  • Est. Priority Date: 03/01/1976
  • Status: Expired due to Term
First Claim
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1. A sprinkler system comprising:

  • a plurality of valves, each of said valves having means responsive to electrical drive control pulses to open and close the valves;

    a controller having first and second controls, said controller being a means for repetitively providing a train of drive control pulses on a plurality of controller terminals, at intervals determined by said first control in accordance with a desired watering frequency, said drive control pulses in each pulse train being separated in time as determined by said second control in accordance with a desired watering time; and

    means for coupling said controller terminals to said plurality of valves.

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