Simple analog DC diagram

Discussion in 'General Electronics Chat' started by Joneken, Jul 30, 2016.

  1. Joneken

    Thread Starter New Member

    Jul 30, 2016
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    Hi, I need to have a simple DC diagram to act as a warning, when a connection is on, a light or buzzer to be off, and when same connection goes off, that light or buzzer activates.
    This is for a hobby and therefore can't gone complicated
    Thanks
     
  2. AlbertHall

    Well-Known Member

    Jun 4, 2014
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    You will need to be more specific about 'a connection is on'. Connection of what to what?
     
  3. Ramussons

    Active Member

    May 3, 2013
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    Do you want it using "active" components like a Transistor or "passive" ones like a Relay?
     
  4. BillB3857

    Senior Member

    Feb 28, 2009
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    Or just a switch, batty and buzzer?
     
    shteii01 likes this.
  5. Joneken

    Thread Starter New Member

    Jul 30, 2016
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    My connection is conducted between two galvanised nails, that are inside a moisture medium, as a normal situation, with an acceptable level of moisture the buzzer supposed to be off, when the moisture reduced and connection between to heads of nails gone off, I need the buzzer goes on. ( please note the medium is not soil, the buzzer could be, Piezo Electronic Buzzer Effect Tone Alarm 3-24VDC 12V Continuous Beep Arduino, therefore system should work with a 12V battery )
    Thanks and best regards
     
    Last edited: Jul 31, 2016
  6. Joneken

    Thread Starter New Member

    Jul 30, 2016
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    No, idea, but the simpler the better.
     
  7. blocco a spirale

    AAC Fanatic!

    Jun 18, 2008
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    That's not what you said in your first post which suggested the input was a switch. Since no one knows what the "moisture medium" is or, more importantly, the resistance threshold at which the buzzer should sound, it's not possible to provide a solution. Perhaps you could find out that information?
     
  8. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    This may work for you, but success or otherwise would depend on soil/medium mineral content, nail spacing and immersion depth, in addition to moisture range.
    SoilTester.JPG
     
    Last edited: Jul 31, 2016
  9. Joneken

    Thread Starter New Member

    Jul 30, 2016
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    Or just a switch, batty and buzzer?

    Hi, sorry I confused about your question, I think what I need is a 12 V battery of course plus a buzzer, I do not know how this communication is working, but I copy an explanation That I have send to another member.

    My connection is conducted between two galvanised nails, that are inside a moisture medium, as a normal situation, with an acceptable level of moisture the buzzer supposed to be off, when the moisture reduced and connection between to heads of nails gone off, I need the buzzer goes on. ( please note the medium is not soil, the buzzer could be, Piezo Electronic Buzzer Effect Tone Alarm 3-24VDC 12V Continuous Beep Arduino, therefore system should work with a 12V battery )

    Thanks and best regards
    Hi again, sorry I was not clear, what I meant is that, there is a medium, like glass wool, that has a certain amount of water inside, therefore if these two nails with certain distance enter there, right amount of moisture will arrange needed conductivity between head of two nails.
    Hope it's clear the idea.
    Regards
     
  10. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    If the water is pure it is a very poor conductor, so the proposed method may not be reliable.
     
  11. hp1729

    Well-Known Member

    Nov 23, 2015
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    What is the typical resistance of the moist material? Clean water is not conductive.
    "Arduino" conflicts with "not complicated".
     
  12. Joneken

    Thread Starter New Member

    Jul 30, 2016
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    Hi again, I do not have any idea, my meduim is stone wool and two nail with few millimeters distance inside of this stone wool, and whole concept is to keep this mediume with certain moisture and the distance of head of two nail could be adjust base on try and error and base on design of electric circuit.
    Best regards
     
  13. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    I suggest you do an initial experiment. Mount the 2 nails the required distance apart in the moist medium and tell us the measured resistance between the nails.
     
  14. shteii01

    AAC Fanatic!

    Feb 19, 2010
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    KISS, properly applied.
     
  15. AlbertHall

    Well-Known Member

    Jun 4, 2014
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    ...will always melt hearts.
     
  16. hp1729

    Well-Known Member

    Nov 23, 2015
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    Stone wool? As opposed to fiberglass wool? Are you working at 600 degrees and expecting to find moisture?
     
  17. AlbertHall

    Well-Known Member

    Jun 4, 2014
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    It is used for insulation:
    "ROCKWOOL stone wool insulation shields buildings and their occupants, improving safety, comfort and building value. The World Health Organisation has left stone mineral wool off its list of potential carcinogens following long-term studies. After more than 60 years in use, ROCKWOOL insulation has proven to be the safe and most durable choice."
     
  18. hp1729

    Well-Known Member

    Nov 23, 2015
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    I guess fiberglass wool was deemed unsafe? Last time I looked stone wool was a good insulator for higher temperatures.
     
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