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Speed controller for valves

Discussion in 'General Electronics Discussion' started by downtime89, Feb 14, 2012.

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  1. downtime89

    downtime89

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    Feb 14, 2012
    Hey guys this is my first post here, i found this site on google, I am trying to make a system for a aquarium, but in a nut shell what i want to do is to control to electronic sprinkler valves (from home depot $13) But what i want to be able to do with them is have one open and one closed at all time, but i want them to be switching back and forth at a adjustable rate (say anywere between say 5 seconds and 5 minutes or so) How can i build a power supply that i can adjust the speed to do this? I would prefer it to be as simple as possible.
     
  2. downtime89

    downtime89

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    Feb 14, 2012
    I think what i need to do (correct me if i am wrong) is get a 120v 5pin relay and make valves connect to pins 3 and 4. But how do i make a adjustable power supply that "flickers" to make the relay switch back and forth at speeds that i choose?
     
    Last edited: Feb 14, 2012
  3. BobK

    BobK

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    Jan 5, 2010
  4. twister

    twister

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    Feb 12, 2012
    Don't they make valves that work off of low voltage DC? I think that would be a lot safer! Electricity and water don't mix well. If you insist on using 120 volts, a triac might be an easier and better solution than a relay.
    A flip flop sound like it would work for your circuit. A flip flop has a trigger and two outputs and it switches back and forth between them at each trigger. A mosfet transistor could could control a 12V valve. You could trigger the flip flop with a 555.
     
  5. downtime89

    downtime89

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    Feb 14, 2012
    ok i was wrong the valve is 24vac. So will the 555 and that mosfet still work? reading on that link now.
     
  6. twister

    twister

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    Feb 12, 2012
    Are you sure it's AC? A mosfet won't work on AC. You will need a triac. Do a search for 555 and also flip flops and triacs.
     
  7. twister

    twister

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    Feb 12, 2012
    Now that I think about it, perhaps a relay is your best choice. Just trigger it with a 555.
    Do a search for 555 circuits.
     
  8. downtime89

    downtime89

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    Feb 14, 2012
  9. downtime89

    downtime89

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    Feb 14, 2012
    I think the first is better, it even says sprinkers but here is why this is what it says for


    --------- Interval timer = As long as the button is pushed, the load will remain on during delay1*, and turned off during delay2*-------------


    So what i could do is say set delay 1 for how ever long i want valves open for say 15 seconds at most then delay two for 2 seconds (mininum time the valve operates)

    This sound right? i would prefer the time to be less as this is going to be hooked up to a 1k gph pump and i dont know how that preasure is going to be on it for that brief time period.
     
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