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    Thermistor ADC calculation

    3D Printing General Chat
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    • knutselsmurf
      knutselsmurf last edited by knutselsmurf

      I have a Mellow 450'C thermistor with these RT-table:

      Ali_450_mellow.jpg

      According the seller it's thermistor 66 in Marlin, tried that but it gives the wrong temperatures.. Same thing in the BLV (Duet-reprap), other settings..

      For RepRap and Marlin we need some parameters like the ADC-values, the beta and more..

      Can somebody explain how we can calculate this with this Mellow 450'C thermistor as example ?

      (I want to use this thermistor on my Ender5 (Marlin) and on my BLV (Duet-Reprap)).

      Meltex 1 Reply Last reply Reply Quote 0
      • Veti
        Veti last edited by Veti

        go to https://configtool.reprapfirmware.org/Heaters

        click on a beta value, select custom.

        and enter the values for 25, 180 and 300 degrees

        1 Reply Last reply Reply Quote 1
        • Veti
          Veti last edited by

          also see
          https://forum.duet3d.com/topic/19163/help-pid-tuning-dyzend-pro/47?_=1602843872701

          dc42 says that that thermistor is not good for duet or marlin

          1 Reply Last reply Reply Quote 1
          • Veti
            Veti last edited by

            also marlin thermistor 66 is
            // R25 = 2.5 MOhm,

            so its not that thermistor

            1 Reply Last reply Reply Quote 1
            • Meltex
              Meltex @knutselsmurf last edited by

              @knutselsmurf H!

              Did you solve this issue? I have the same thermistor but cannot make it work right.

              Veti 1 Reply Last reply Reply Quote 0
              • Veti
                Veti @Meltex last edited by

                @Meltex
                did you read dc42s post?

                Meltex 1 Reply Last reply Reply Quote 0
                • Meltex
                  Meltex @Veti last edited by

                  @Veti yes. I understood that high impendance will not work and there must be 1M resistor in parallel. But I have already switched to regular 100K Epcos and do not want to play with thermistors again without any success that others achieved. Just curious.

                  1 Reply Last reply Reply Quote 0
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