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How to measure conductivity ?

Discussion in 'General Electronics Discussion' started by abhimanyu143, Dec 9, 2014.

  1. abhimanyu143

    abhimanyu143

    10
    0
    Nov 24, 2014
    Hello ,

    I need help I want make automated system using micro controller that will measure the conductivity of many nutrient
    How to measure conductivity of nutrient that are in water ?

    Microcontroller
    multimeter
    battery 12 v dc
    glass water
    Nitrogen
    Phosphorous
    two electrode

    I am using micro controller, two pins of microcontroller are connected with two electrode
    just for example I have 1 glass of water with Nitrogen than I can measure conductivity of Nitrogen . but If I use 1 glass water with Nitrogen and Phosphorous then how can I measure conductivity of two nutrient with two electrodes that are connected with microcontroller?

    we have only two electrode pins that are measuring conductivity of many nutrient I am not sure that the two electrode can measure conductivity of many nutrient .

    I can measure conductivity of single nutrient but the question is how to measure conductivity of different nutrients that are in water ?
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    9,367
    1,903
    Nov 17, 2011
    You can only measure the conductivity of the solution as a whole. You will not be able to separate the conductivities of different elements solved in water. If you need to determine the conductivity of different materials you will have to provide separate solutions and measure each separately.

    You will not measure the conductivity of nitrogen but the conductivity of water. I think you probably do not mean pure nitrogen (or phosphorus in your second example) but some salt of these elements, solved in water.
    If you really want to measure the conductivity of pure nitrogen or phosphorus, you will need the pure elements, not a solution in water. This will be difficult, to say the least, as nitrogen is a gas and becomes liquid only below -195.8 °C whereas phosphorus is solid and will melt only above 280.5 °C:(

    You will most probably also need a suitable so called analog front end (amplifier, filter) to process the weak signal from the electrodes such that the microcontroller will be able to convert it to a digital signal (using an A/D-converter, either separate or built-in) and process the digitized values.
     
    abhimanyu143 and Arouse1973 like this.
  3. shrtrnd

    shrtrnd

    3,672
    453
    Jan 15, 2010
    There are plenty of manufacturers who make conductivity measurement devices. I'd be looking at one of those unless this is a design question.
     
  4. abhimanyu143

    abhimanyu143

    10
    0
    Nov 24, 2014
    I want to grow plant in mixed of liquid nutrient and water
    Plant growing in water

    Requirement
    Water
    Fertilizer

    Best time to Fertilize
    Plant grow from seed we need to Fertilizer plant after their active growth
    For better growth , we need to provide right Fertilizer at right time on basis of plant sie , weather, deases
    Example- on the basis of plant size
    Small plant need less Fertilizer
    Large plant need more Fertilizer

    Its all about agriculture site

    Now from electronics site. I want to make automated system that take decision , Add more or less Fertilizer into water . If the plant require less or more Fertilizer the system can adjust itself
    That’s why I am using microcontroller Ic How to make automated system that will take decision Add more or less Fertilizer into water?
     
  5. shrtrnd

    shrtrnd

    3,672
    453
    Jan 15, 2010
    That's called hydroponics. Google it and you'll get hits on all kinds of advice and companies involved in this.
     
    Last edited by a moderator: Dec 10, 2014
  6. abhimanyu143

    abhimanyu143

    10
    0
    Nov 24, 2014
    we can measure conductivity of whole solution. we can't measure separate the conductivities of different nutrient solved in water
    for example we can not measure the separate conductivity of potassium (K), phosphorus (P) and nitrogen (N). but we can measure conductivity of whole solution In water.
    I can't buy conductivity sensor .how to measure conductivity of whole solution in water without conductivity sensor ?
    I have listed some component That can I use
    water , NPK Fertilizer ,multimeter , two electrodes
     
  7. abhimanyu143

    abhimanyu143

    10
    0
    Nov 24, 2014
    Please help me I am not understanding how to make electronic circuit for automatic hydroponic system using microcontroller
     
  8. Harald Kapp

    Harald Kapp Moderator Moderator

    9,367
    1,903
    Nov 17, 2011
  9. abhimanyu143

    abhimanyu143

    10
    0
    Nov 24, 2014
    home made conductivity sensor
    specification
    two copper wires
    two platinum electrode

    I am not sure. Does it work for conductivity ?
     
  10. abhimanyu143

    abhimanyu143

    10
    0
    Nov 24, 2014
    automated hydroponic plant system that will sense condition(conductivity of water ) and provide sufficient Mineral Nutrients for growing hydroponic plant.

    we place the seed into water, seed grow into water , growth should start after 2 or 3 weeks.we don’t feed fertilizer until the first set of true leaves appears When seeding develop their true leaves and roots. Its time to feeding fertilize.we need to provide right fertilizer for good growth
    Most common fertilizer is NPK, after two or three weak or after the first set of true leaves apper we need to fertilize plant. Fertilize approx every two weeks
    Automated system (small and low cost system)
    Parameter – conductivity

    Project part list
    Electrodes probes
    Micorcontroller
    Amplifier or filter
    Resistor
    A to D converter Ic
    Volve or relay

    Automated system that Add more or less fertilizer into water ,that maintain conductivity range

    fertilize plant after their active growth ,after two or three weak or after the first set of true leaves apper we need to fertilize plant
    ADD small value of NPK into water because small plant take less fertilizer
    After two weeks Add large value of NPK into water because large plant take large fertilizer

    I want to make Automated system that will Add more or less fertilizer into water
    If plant need more or less fertilizer system will adjust itself

    If you need more Information to help me, please ask me
     
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