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Push Button H2O - Reversing Polarity

Discussion in 'General Electronics Discussion' started by mcasey, Jul 9, 2016.

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  1. mcasey

    mcasey

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    Jul 9, 2016
    I'm trying to avoid using a momentary rocker switch in order to turn a magnetically latching 9 volt solenoid valve on and off. I like the idea of using a single soft rubber push button (making contact with some circuit beneath, I guess...) to turn the valve on and off. Any ideas?
     
  2. Bluejets

    Bluejets

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    Flip flop circuit?
     
  3. mcasey

    mcasey

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    Jul 9, 2016
    Thank you Bluejets... I have been searching online since your response for a "flip flop circuit switch". I find many schematics, but no hardware. Forgive me for sounding ignorant... I know what I want to accomplish, I just do not know much about electronics and/or electricity...
     
  4. mcasey

    mcasey

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    Jul 9, 2016
    Basically, I have a 9 volt latching solenoid valve that i want to attach to "something" with a on off push button. I tested the valve by connecting the wires to the terminals of a 9 volt battery. It works fine, but I have to "flip flop" the connections in order to make the valve turn on and off.
     

    Attached Files:

  5. Gryd3

    Gryd3

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    Jun 25, 2014
    You could go buy a 'latching' relay...
    The flip-flop is a circuit you can build with a number of different parts, or can be purchased as a component...
    I'm not aware of a 'module' you can buy that will do this though.
     
  6. mcasey

    mcasey

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    Jul 9, 2016
    How is a latching solenoid valve typically wired in? They are all over the internet for sale, but no one offers instructions on how to wire them in...
     
  7. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    My presumption is that a latching solenoid is like a latching relay in that power is only required to change the state, but not to maintain it.

    it could have 1 coil where the polarity is reversed, or 2 coils.

    in either case a momentary double pole double throw switch with a centre off will do the trick. the disadvantages are that the final switch position will not indicate the solenoid state (which it sounds like you don't need) and you need a different action to turn it on vs. off (which may be an advantage or a disadvantage)

    knowing how to wire it... well we need more details on the solenoid
     
  8. mcasey

    mcasey

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    Jul 9, 2016
    This is all I can find on the valve I own. The instructions simply state "another short 6V pulse to close", no mention of polarity. So here I am, relying on the advise and good will of strangers to help me out...
     

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  9. mcasey

    mcasey

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    Jul 9, 2016
    I also found this for a different brand valve...
     

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  10. BobK

    BobK

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    Well then, simply wiring a momentary contact switch to it will flip it with each press.

    Bob
     
  11. mcasey

    mcasey

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    Jul 9, 2016
    Thanks to all for your help. I think the momentary 2 pole switch will work just fine for my needs. This forum is awesome!
    Case Closed
     
  12. BobK

    BobK

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    Not really. You misunderstand.

    The pulse to open and the one to close are the same polarity. You do not need a two pole switch.

    Bob
     
  13. mcasey

    mcasey

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    Jul 9, 2016
    Are you saying this because of what the instructions read? I think the instructions are wrong because, as mentioned above, when I test it with a 9 volt battery I must touch red to the positive terminal and black to the negative terminal to get it to open, then flip flop the connections to get it to close.
     
  14. BobK

    BobK

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    Yes, I am going by what the link you posted said. Did you try to see if using the same polarity twice also might flip it? Because that is what I read the specs as saying.

    And, a normal solenoid pulls one direction no matter which way it is connected. But there are solenoids with a magnetized rod that would go opposite directions depending on polarity.

    Bob
     
  15. BobK

    BobK

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    Jan 5, 2010
    Reading several descriptions of the this, I am totally convinced you do not have to reverse the polarity. Each pulse simply flips it from one state to the other. There is never a mention of reversing the polarity. I would be pissed if I bought this based on the description and it did not work the way I think it does.

    Bob
     
  16. mcasey

    mcasey

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    Jul 9, 2016
    This switch works great. However, what if I wanted to activate the switch wireless? Could I use some sort of relay to achieve the same results?
     
  17. Bluejets

    Bluejets

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    Oct 5, 2014
    Perhaps an R/c tx rx from China with a receiver controlled on off switch.
    Many ways to achieve what you want but the advantage using the above is there is no building or programming to do.
     
  18. mcasey

    mcasey

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    Jul 9, 2016
    I have one. but the polarity issue is the problem. would i need a two channel t/c tx rx?
     
  19. Bluejets

    Bluejets

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    Don't know what you mean "polarity issue".
    Do you have a tx/rx?
    Don't know why you need 2 channels but most come with 4 or 5 for about $30 anyhow.
    Do you have a receiver controlled switch also or were you referring to the radio when you say you have one.
     
  20. Kiwi

    Kiwi

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    Jan 28, 2013
    "Yes, I am going by what the link you posted said. Did you try to see if using the same polarity twice also might flip it? Because that is what I read the specs as saying."

    Have you tried this as requested by Bob?

    Confirm state of valve, ie open or closed.
    Connect the black wire to negative.
    Briefly touch red wire to positive and then disconnect.
    Reconfirm state of valve.

    Did the valve change state?
     
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