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    Hotend heater does not show up in DWC

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    • jay_s_ukundefined
      jay_s_uk @mendenmh
      last edited by

      @mendenmh the resistance of normal thermistors goes down when the temperature increases. Thats what NTC means negative temperature coefficient, so the values go in opposite directions.
      PT100/1000 are positive temperature, so both values go in the same direction

      @foesi using 84000 is incorrect. the value stated in the firmware is the value the thermistor will read at 0 degrees, so 100000 is what you should be using

      Owns various duet boards and is the main wiki maintainer for the Teamgloomy LPC/STM32 port of RRF. Assume I'm running whatever the latest beta/stable build is

      mendenmhundefined 1 Reply Last reply Reply Quote 0
      • mendenmhundefined
        mendenmh @jay_s_uk
        last edited by

        @jay_s_uk You and I said the same thing, about the negative temperature coefficient. I said resistance is higher at lower temperatures; you corrected to lower at higher temperatures. 🙂

        However, your statement about the value for a thermistor being specified at zero degrees is wrong. Most thermistors are standardized at 25C. Pt100/Pt1000 are, indeed, standardized at 0C. But it is still correct that the 100000 is the right number to have put in the file.

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