water level indicator

Discussion in 'The Projects Forum' started by aftabalam, Aug 14, 2011.

  1. aftabalam

    Thread Starter New Member

    Aug 14, 2011
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    can any one how to make a simple water level indicator.It should be low cost between RS.100 TO RS.250.
     
  2. KMoffett

    AAC Fanatic!

    Dec 19, 2007
    2,641
    249
    Are you wanting a one point indication?...a two point indication (high and low)?...a continuous level display (empty to full)? And, what is "RS."?

    Ken
     
  3. iONic

    AAC Fanatic!

    Nov 16, 2007
    1,422
    69
    Search the net for "Water Level alarm circuit" and you will find many many hits on this topic.
     
  4. SgtWookie

    Expert

    Jul 17, 2007
    22,194
    1,761
    RS = India's Rupee.
    $1 USD ~= 45.5 RS
    100 RS ~= $2.20 USD
     
  5. wayneh

    Expert

    Sep 9, 2010
    13,435
    4,272
    Stick a cheap yardstick into the vessel until it hits bottom. Read the level where the stick emerges from the water. Done. You can send me the balance if you have anything left from your budget. ;)
     
  6. someonesdad

    Senior Member

    Jul 7, 2009
    1,585
    141
    So you're asking for a water level indicator that costs less than about 5 USD. Get some cheap vinyl tubing and make a homemade sight glass.

    If you want something electrical, you can take a look at how the water level is measured in RV water tanks (on-off resistance type detection).
     
  7. taslim_i

    New Member

    Oct 29, 2015
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    0
    I am aware of the fact that it's an old thread, I have attached a circuit similar to the one posted earlier. In this circuit I used a hex inverter Schmitt trigger IC (74HC14) instead of 4093 to recreate the same functionality. And it's working fine but I am concerned about the noise and the vulnerability of the probes to touch, when i earthed the ground the vulnerability is solved.. my query is for how to overcome the issue without earthing the ground, maybe the noise from the oscillator is causing this. Is there any possible water to eliminate the noise.
     
  8. DickCappels

    Moderator

    Aug 21, 2008
    3,821
    1,040
    There is a way to greatly reduce the noise but it would require a synchronous demodulator (clocked by your oscillator) which would include an analog multiplexer (1/3 CD4053) two opamps per channel. That's a lot of parts to add to your elegant circuit.

    What is the objection to grounding the circuit?
     
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