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    Thermistor 500°C with Duet3

    Tuning and tweaking
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    • Anopsia1000
      Anopsia1000 last edited by

      Hi,

      Is there a way to use a thermistor 500°C with the Duet3

      Sensors config is

      M308 S1 P"121.temp0" Y"thermistor" T4606017 B5848 C5.548428e-8
      M950 H1 C"121.out0" T1

      My reading is -273°C, impossible to heat up. Always faulty.

      Thanks.

      Stephen6309 dc42 TLAS zapta 4 Replies Last reply Reply Quote 0
      • Stephen6309
        Stephen6309 @Anopsia1000 last edited by

        @anopsia1000 Check you connections, -273 usually means a short.

        1 Reply Last reply Reply Quote 0
        • dc42
          dc42 administrators @Anopsia1000 last edited by

          @anopsia1000 does it really have a resistance of 4.6Mohms at 25C? If so then it's going to be hard to read at room temperature.

          How old is the tool board? If it wasn't running firmware 3.3 when you received it, then you may need to run calibration (using 3.3 or 3.4beta firmware). See https://duet3d.dozuki.com/Wiki/Calibrating_thermistor_and_PT1000_readings.

          Duet WiFi hardware designer and firmware engineer
          Please do not ask me for Duet support via PM or email, use the forum
          http://www.escher3d.com, https://miscsolutions.wordpress.com

          Anopsia1000 1 Reply Last reply Reply Quote 0
          • Anopsia1000
            Anopsia1000 @dc42 last edited by

            @dc42 Thanks for the answers.

            Wiring is brand new, no shorts. I confirm the T25 R is 4606017 ohm.

            board: duet 3mb6hc
            firmware: 3.3 config w/ reprap online configurator.

            Will try the calibration.

            At room temp on a duet2 firmware 2 I have no issue beside the usual low accuracy at room temp.

            dc42 1 Reply Last reply Reply Quote 0
            • dc42
              dc42 administrators @Anopsia1000 last edited by

              @Anopsia1000

              M308 S1 P"121.temp0" Y"thermistor" T4606017 B5848 C5.548428e-8

              That command says that sensor 1 is connected to a tool board, not the 6HC main board. Is that correct?

              Duet WiFi hardware designer and firmware engineer
              Please do not ask me for Duet support via PM or email, use the forum
              http://www.escher3d.com, https://miscsolutions.wordpress.com

              1 Reply Last reply Reply Quote 0
              • TLAS
                TLAS @Anopsia1000 last edited by

                @anopsia1000
                Please keep in mind that most thermistors are rated to ~250C. If you went above that, it’s a gamble if it’ll read correctly or survive without a short.

                1 Reply Last reply Reply Quote 1
                • zapta
                  zapta @Anopsia1000 last edited by

                  @anopsia1000 , can you share the specifications/datasheet of your thermistor?

                  Gixxerfast 1 Reply Last reply Reply Quote 0
                  • Gixxerfast
                    Gixxerfast @zapta last edited by

                    @zapta It's most likely the Trianglelabs D500 thermistor.

                    Datasheet in here:
                    https://forum.duet3d.com/topic/24306/duet-2-wifi-problem-with-the-t-d500-thermistor

                    Voron V2.4 (#1317) with Duet 3 Mini5+ Wifi and 1LC v1.1 Toolboard
                    Voron V0.1 (#637) with Duet 3 Mini 5+ Wifi and 1LC v1.2 Toolboard
                    Ender 3 Pro with BTT SKR-2 + RRF

                    1 Reply Last reply Reply Quote 0
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