14 Comments

  1. October 18, 2011 at 7:54 pm

    stephen

    why i follow this water level indicator circuit it don’t not working?

    Reply
  2. October 18, 2011 at 8:52 pm

    LDRENGINEERING.ORG

    Check these things:

    a. did you properly connect the pins of transistor? Do you know which pins are emitter, base and collector. You can see it here: http://www.fairchildsemi.com/ds/BC/BC547.pdf
    Keep some extra transistors, may be the transistor you are using is already broken.

    b. Did you connect the LED properly? Check the LED putting from both sides and check with some other LEDs also, to be sure if all the LED are working.

    c. Put 470KOhm or 1MOhm in place of VR1.

    d. Check the battery properly.

    e. Water should not be 100% clean :D, it works only for somewhat impure water, because there has to be some minerals to make the water conduct. If you have 100% pure water, put some salt in it.

    Write me again if it doesn’t work.

    Reply
  3. April 16, 2012 at 10:54 am

    gallactronics

    Hi! This quite an interesting circuit. But if you want to make an even simpler and effective water level indicator and alarm, you can check out this site:

    http://gallactronics.blogspot.in/2011/11/basic-water-level-alarm.html
    Hope it was useful!

    Reply
  4. July 2, 2012 at 12:01 pm

    neeraj

    How can I add buzzer to it…………………

    Reply
    1. July 2, 2012 at 12:11 pm

      Sagar

      Remove LED and put a buzzer, simple!

      Reply
  5. July 29, 2012 at 10:43 am

    Neeya

    How can we apply some feedback in connection to this circuit?

    Reply
  6. November 27, 2012 at 12:41 pm

    Giuseppe

    Hi.
    How can I do for reversing original functionment ? i.e. I prefer that led will bright (and the buzzer sounds also)
    WHEN the bared copper leads are dipped togheter, at the same level, into water,
    revealing thus the “presence” of water.
    Thanks.

    Reply
  7. December 12, 2012 at 1:17 pm

    akhilesh

    How to add relay to on-off water pump or just off the pump after full of tank….plz reply me in mail also if possible.

    Reply
    1. December 27, 2012 at 12:14 pm

      Sagar Sapkota

      Learn how to use a relay: http://www.buildcircuit.com/how-to-use-a-relay/

      Reply
  8. December 15, 2012 at 12:17 pm

    caniokoc

    How can I add a relay to this circuit? Thanks

    Reply
    1. December 27, 2012 at 12:13 pm

      Sagar Sapkota

      Learn how to use relay: http://www.buildcircuit.com/how-to-use-a-relay/

      Reply
  9. April 16, 2013 at 7:33 am

    Just Askin

    Hey…..is there any way to add a relay to this circuit?

    🙂

    Reply
  10. July 10, 2014 at 8:05 pm

    JLodge

    Sweet circuit!

    If anyone is interested in creating an alternative water level sensor, check this out: http://vegetronix.com/Products/AquaPlumb/

    This one works capacitively rather than the traditional float based system. If it piques anyone’s interest, it also happens to work in many different types of liquids – both polar and nonpolar. Not really sure how it works exactly, but thought it was very cool.

    Reply
  11. July 10, 2014 at 8:10 pm

    JLodge

    Does anyone know how this water level sensor works? http://vegetronix.com/Products/AquaPlumb/

    I know that it is a capacitive sensor, but I don’t understand why it is able to work in both polar and nonpolar liquids.

    Can anyone shed some light?

    Reply

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.