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water level indicator

Discussion in 'General Electronics Discussion' started by deepakgupta.rf, Aug 18, 2011.

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  1. deepakgupta.rf


    Aug 14, 2011
    hello everyone
    i have made water level indicator based at cd 4066 there we put 4 metal screw and wired to our kit.
    in that one is +12v supply and rest three are inputs. and at last one we use relay for loud siren.
    but there we are facing trouble with earth problem.there earth making flicking in realy and relay flicking very fastly and we are feared also that is that current we leave in water current can make any trouble when we use water or get any shock.
    here i am attaching a file for this but here after bc148 i used a 12 v small relay for siren so this realy is getting flicked.
    please solve my problem

    Attached Files:

  2. poor mystic

    poor mystic

    Apr 8, 2011
    Hi deepakgupta.rf :)
    It's a little hard to penetrate your grammar, which is unique.
    However, I wonder where this other current might be coming from and I think you should sort that out first.

    PS Be very sure that everything is well earthed!
  3. dauntless


    Nov 1, 2013
    Hi all, water level indicator based at cd 4066

    I have made the below circuit for a school project and found the 4th LED (Full) is not lighting when the full probe touches water level. buzzer is ringing. also all other leds (3) get extinguished. Just extended the reference probe (common 6v) near to the 4th LED (full) probe and extinguishing problem (other 3 leds) solved and still the full led did not light up. any help????:(

  4. shrtrnd


    Jan 15, 2010
    Make sure your grounds are correct. As poor mystic mentioned, make sure you're
    not picking-up stray current flows. If you've got a voltmeter hooked-up to your circuit,
    disconnect it for circuit operation. Any strong electromagnetic fields in the vicinity
    of your circuit, move them (Power supplies, other emf generators).
    When I built my water/water/level sensor circuit, I found you needed 'dirty' water that
    has conductive contaminants in it. The cleaner the water, the less reliable the contact
    connections to the 4066. Good luck.
  5. dauntless


    Nov 1, 2013
    No luck. just removed the full level LED and adjusted the project report with 3 level led and just buzzer for full level.
  6. DLD


    Nov 5, 2013
  7. duke37


    Jan 9, 2011
    There will be no danger if you are using an isolated 12V supply.

    The 180k resistors could be raised to say 1M if necessary which may make more reliable operation.

    The 2.2k feeding the BC148 is very low. The BC148 could be replaced by a fet or a darlington transistor with a high value drive resistor.
    A Darlington can be made with a pair of BC148.

    More reliability would be achieved if a positive electrode were placed near each sense electrode.
  8. Arouse1973

    Arouse1973 Adam

    Dec 18, 2013
    Why don't you put the buzzer across the 4th LED and resistor and get rid of the transistors? That's assuming is not a 100dB sounder that draws an amp or two :)
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