connecting PT100 to uController

Discussion in 'The Projects Forum' started by eric_s88, Nov 6, 2013.

  1. eric_s88

    Thread Starter Member

    Apr 20, 2011
    157
    1
    Hi everybody :)

    I'm going to measure a surface temperature with pt100. what I got from this sensor is that, its resistance varies with the temperature. and the "100" stands for 100 \Omegaresistance in 0 degrees. and should have a current source to transform the resistance to a voltage and feed this to uC adc. (10bit)

    my problem is how to design current source ? would it be right to use current source ICs ? and how much big should be that current ?

    please help me in any useful information about driving and running this sensor .

    thank you :)
     
  2. MikeML

    AAC Fanatic!

    Oct 2, 2009
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    Here is something I did years ago: (never throw anything away). Stare at it for a while, and come back if there is something you dont understand.
     
  3. Dodgydave

    Distinguished Member

    Jun 22, 2012
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    one here for an Arduino..
     
    eric_s88 likes this.
  4. MikeML

    AAC Fanatic!

    Oct 2, 2009
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    I question why, in that circuit, they start with the bridge unbalanced?
     
  5. Dodgydave

    Distinguished Member

    Jun 22, 2012
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    Maybe starting at a different temperature than yours, alter the bridge resistors to suit your design
     
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