NTC thermistor

Discussion in 'General Electronics Chat' started by anandhuskumar, May 14, 2014.

  1. anandhuskumar

    Thread Starter New Member

    May 14, 2014
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    How can i interface an NTC thermistor with pic micro controller?? How can I get the Steinhart-Hart coefficients? please help..:(
     
  2. pwdixon

    Member

    Oct 11, 2012
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  3. AnalogKid

    Distinguished Member

    Aug 1, 2013
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    If you are going to program the inverse of the S-H equation into the PIC then all you need is a single resistor to a well-regulated voltage. The resistor and the thermistor form a voltage divider, and the center node goes to the PIC A/D input.

    However, that will not give the best results over a medium or wide temperature range. The thermistor response curve is so non-linear that it is difficult to get accurate readings at high temperatures with an 8 or 10 bit A/D. An external linearizing circuit will reduce the overall accuracy somewhat because of component tolerances, but the high end resolvability will improve.

    ak
     
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