Water Tank level control...

Discussion in 'The Projects Forum' started by RRITESH KAKKAR, Jan 23, 2015.

  1. RRITESH KAKKAR

    Thread Starter Senior Member

    Jun 29, 2010
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    Hello,
    How to build ? mean to say what to choose for sensing the level of water in tank rather than using ultrasonic and current sensing probes in tank.
    Thats main solution i am searching m it should look good not just a wires ..!
    after that i will build a control box which will control pump motor according to level of motor!

    Thanks
     
  2. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,998
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    A simple table tennis ball in a tube, with photo cells at different levels will do, or a resistance strip ,do you want to sense if its empty and full only?
     
  3. RRITESH KAKKAR

    Thread Starter Senior Member

    Jun 29, 2010
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    Hello,
    How build this tennis ball in tube??
     
  4. ScottWang

    Moderator

    Aug 23, 2012
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    How height of the water tank?
    Do you to sense the different water level?
    Maybe you could describe more clearly then it will help to solve your problem.

    You may check this first -- uln2004-water-level-indicator.
     
  5. Reloadron

    Active Member

    Jan 15, 2015
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    There are a number of ways to go about it. A float mechanically driving a LVDT is one way. Depends on the tank size and what you want to spend? A better project description would help!

    A common method can be seen here. Tank gets low add water tank gets full remove water? I would use a pressure transducer and measure the pressure which is directly proportional to the level of the water in the tank. Even a small 8 pin uC could run the whole show.Not that a uC is needed, the thing could also run on discreet components, again, what exactly do you want to accomplish?

    Ron
     
    Last edited: Jan 23, 2015
  6. strantor

    AAC Fanatic!

    Oct 3, 2010
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    harvest a float arm from a toilet, mount it on a potentiometer.
     
  7. KMoffett

    AAC Fanatic!

    Dec 19, 2007
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    RRITESH,
    People are looking for details. How deep is the water level when full? Do you want to maintain one level...full? Or do you want two levels...full and empty.
    Scott,
    DC driven electrodes in that circuit will corrode. AC driven ones are better for long term submersion.

    Ken
     
  8. Reloadron

    Active Member

    Jan 15, 2015
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    Harvest a pressure switch from an old washing machine. :) Then modify it for your tank level.

    Find a toilet tank pressure type fill valve, like one of these.

    Ah, the possibilities are endless. Actually one of our toilets uses one of those pressure valves which is adjustable. I put that thing in the toilet 25 plus years ago and it has outlasted all the other toilet valves in this house combined.

    Ron
     
  9. MaxHeadRoom

    Expert

    Jul 18, 2013
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  10. ScottWang

    Moderator

    Aug 23, 2012
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    Thanks for your comment.
    If you mean that DC circuit for this thread, it just offering an idea to let him to think of, I think the TS may not have a good idea, so he asked for help.
    If you talking about the page that I linked, I didn't thinking too much at that time and I just modified the circuit to suit what the TS asked for help.
     
  11. KMoffett

    AAC Fanatic!

    Dec 19, 2007
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    I was referring to the linked schematic. But we still lack specific info from the "TS"(?).

    Ken
     
  12. ScottWang

    Moderator

    Aug 23, 2012
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    The situation are the same in other forums or in Taiwan ... :(
     
  13. John P

    AAC Fanatic!

    Oct 14, 2008
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    Hang a rod in the tank, and measure its apparent weight with a load cell. The higher the liquid goes, the lighter the rod will seem to be.
     
  14. RRITESH KAKKAR

    Thread Starter Senior Member

    Jun 29, 2010
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    Hello,
    Thanks for super idea of ULN2004 Any way what is the use of diode at same net connecting?
    OK, Actually i will build a tank water pump on/off which will sense the level and display in led only 4 level but the water pump motor will work on empty to full only sense as if(0000) turn on switch through relay , if(1111) turn off switch of motor.
    i was thinking to have some good sort of viewing rod on plastic or wooden rod so, it can read through it!!
     
  15. RRITESH KAKKAR

    Thread Starter Senior Member

    Jun 29, 2010
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    What is diffrence between uln2003 and 2804
     
  16. Reloadron

    Active Member

    Jan 15, 2015
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    The main difference is the internal base resistor. The ULN2003 is designed to be used with TTL (5 Volt) logic inputs. This makes it useful for directly connecting to many micro-controllers. Looking at the design with probes in the tank there is, depending on water purity, a good possibility the probes will corrode quickly and need frequent cleaning.

    Ron


     
  17. ScottWang

    Moderator

    Aug 23, 2012
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    7 darling drivers and 8 darling drivers.
     
  18. Reloadron

    Active Member

    Jan 15, 2015
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    Scott, I thought they were all 7 darlington drivers:
    I thought this "What is difference between uln2003 and 2804" was a typo where he referenced the 2804? y bad on that note. :(

    Ron
     
  19. ScottWang

    Moderator

    Aug 23, 2012
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    ULN2804 - 8 darlington drivers.
     
  20. Reloadron

    Active Member

    Jan 15, 2015
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    Yeah, I read the data sheet, my bad. :(

    Ron
     
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