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Change in current to change in voltage

Discussion in 'Beginner Electronics' started by [email protected], Jan 4, 2007.

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  1. Guest

    Hi,
    I'm new here and am really a programmer and just play with
    hardware and electronics when I get enough free time so please be
    patient with me.

    I was wondering if it is possible to have a change in current and
    convert it into a change in voltage, I'm interested in connecting a
    thermistor
    to an ADC on a microcontroller to take temperature readings, and as
    thermistors change resistance dependent on temperature, and the ADC
    only detects changes in voltage between a specific range I was looking
    for a solution to this problem.

    Thanks for your time.
     
  2. PeterD

    PeterD Guest

    Common application. Feed the thermistor with a current limited voltage
    soruce (say a 33K resistor to a voltage source). Make sure the current
    in the thermistor is sufficiently negligable that there is no self
    heating. Then measure the voltage across the thermister.

    See http://www.technologystudent.com/elec1/therm1.htm for some
    suggestions. Also see
    http://www.embedded.com/shared/printableArticle.jhtml?articleID=9900485
    (about a third of the way down) as another example. You may be able to
    drive the ADC directly with the thermistor, or you may need to add an
    op amp as described.
     
  3. jasen

    jasen Guest

    you could use a resistor, they convert between voltage and current.
    yup use a resistor.
     
  4. Guest

    Thanks guys that is great!
     
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