need help for water level indicator

Discussion in 'General Electronics Chat' started by bilalsaeed, Sep 11, 2008.

  1. bilalsaeed

    Thread Starter Member

    Mar 30, 2008
    22
    0
    Hi.
    I copied this schematic from internet about water level indicator. I tried it but its not working. Plz Help needed. if any one has a better working indicator or could run this circuit so plz reply
    [​IMG]
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Can you tell us what part of the circuit does not work? You are supplying +6 volts DC, I hope?
     
  3. bilalsaeed

    Thread Starter Member

    Mar 30, 2008
    22
    0
    yes i am supplying +6v dc . I cant find any voltage at the led side i changed the ic in case of any error but no use
     
  4. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    I guess you're using a CMOS 4066 IC?

    If your water is too pure (ie: distilled water) it won't work. There must be a very slight conductivity to the water.
     
  5. bilalsaeed

    Thread Starter Member

    Mar 30, 2008
    22
    0
    i m using a normal tap water
     
  6. bilalsaeed

    Thread Starter Member

    Mar 30, 2008
    22
    0
    and yes its CMOS 4066
     
  7. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Try adding just a little bit of table salt to the water,and stir it up. If you don't want to add salt, replace the 180K resistors with 10M resistors.
     
  8. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    The thing that makes this work is the conduction between the container and each electrode through the water.

    Is the connection made so the 6 volts DC is present in the container? If it is metal then all you have to do is connect the voltage lead to the rim. If is is non-conductive, then you will need to connect the lead to a metal disk that is on the inside of the container.

    If you touch the 6 volt lead to each electrode in turn, does the proper LED light up and the buzzer sound?
     
  9. bilalsaeed

    Thread Starter Member

    Mar 30, 2008
    22
    0
    i have just connected a container with a wire normal jumper! i didnt get about the lead thing !


    sorry about the english not good at it !
     
  10. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    The drawing is hard to follow. The circuit should work.
     
  11. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    English is a difficult (hard) language, even for those who have been raised speaking it.

    "Lead" is just not enough information. Lead can be an element (Pb), it can be a connection to a piece of test equipment (a test lead), a jumper on a wiring board, something that is useful in sales, and many other items.

    I do wish I knew more than one language. Perhaps things would make more sense. :confused:
     
  12. Bernard

    AAC Fanatic!

    Aug 7, 2008
    4,175
    397
    WE still have no response to replys # 2 & # 8. Are all LED's always on or off, or a combination ? Is pin 7 grounded, pin 14 at + 6 ?
     
  13. dyeraaron

    Active Member

    Oct 27, 2008
    57
    0
    Here is another schematic of an indicator I came across
     
Loading...