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I Detect current direction in water

  1. Dec 4, 2016 #1
    a bowl is filled with tap water .electric current is made to flow due to electrodes attached to rim of bowl(opposite sides of bowl)
    i have 2 sense pins inserted into the water between the electrodes .
    how can i convert this analog signal(vd across sense pins) to a digital signal to detect direction of current through water and use the signal in a logic circuit?
    the 2 sense pins are fixed in water whereas polarity of supply electrodes is varying with time
    electrode vd is max 5v min -5V. ammeter reads 700 microamps current flowing through water
     
  2. jcsd
  3. Dec 4, 2016 #2

    cnh1995

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    Are you doing this for some project? If budget is not a concern, you can try a hall effect current sensor.
     
  4. Dec 4, 2016 #3
    yes all i need to know is if vd across sense pins is + or -ve
    +ve or 0 vd = high output
    -ve vd = low otput
     
  5. Dec 4, 2016 #4

    cnh1995

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    Ok so you are interested in only the direction of the current? Not magnitude? Also, are you using a microcontroller?
     
  6. Dec 4, 2016 #5
    no im not
    is there any alternative to adc?
     
  7. Dec 4, 2016 #6

    cnh1995

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    I don't think so. Do the sensor pins detect current and give voltage as the output? It would be better if you posted a schematic.
     
  8. Dec 4, 2016 #7
    will opamp voltage comparator do the job
     
  9. Dec 5, 2016 #8

    cnh1995

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    Yes. But it won't be able to read the magnitude of the current. It will sense only the direction.
     
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