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Multiple/Combined Thermistors for a single Tool (Heatbed)

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Duet Hardware and wiring
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  • undefined
    dc42 administrators
    last edited by 19 Jan 2018, 19:01

    The other wire should go to AGND.

    Add parameter X3 to that M305 command to tell it to use thermistor 3 (the one labelled E2).

    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

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    • undefined
      Synapsis
      last edited by 19 Jan 2018, 20:11

      Great thanks David

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      • undefined
        Synapsis
        last edited by 20 Jan 2018, 09:08

        Ok gots things hooked up and setup, my questione is wheere do i find the reading in the Web Control if you can see it that is?
        Under Extra I have only a MCU which has always been there.

        ok found out this:

        M305 P103
        Heater 103 uses Thermistor sensor channel 3, T:100000.0 B:4700.0 C:0.00e+00 R:1000.0 L:0 H:0

        does this meah I have to create a tool Heater 103?

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        • undefined
          Synapsis
          last edited by 20 Jan 2018, 20:38

          @dc42:

          …. (the one labelled E2).

          Sorry but I can,t find a E2 there are other two like E2_Step, E2_N amd more. (which you surly know πŸ™‚ )I thought it was the Pin 35 Labeled Thermistor3-

          Before I burn something I would rather be sure. Thanks

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          • undefined
            dc42 administrators
            last edited by 20 Jan 2018, 21:01

            Yes it's the pin labelled Thermistor 3 if you are connecting directly to the expansion connector.

            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

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            • undefined
              Synapsis
              last edited by 20 Jan 2018, 21:54

              Strange then, please what is the G code to read the temperature as I can not find it.
              Also I see nothing the the Web Control.

              Just a thought is there a specific GND to use I used Pin 42.

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              • undefined
                dc42 administrators
                last edited by 20 Jan 2018, 23:06

                Connect it to the AGND pin (also called VSSA), not GND.

                You will find the additional temperature in DWC if you follow the Extra link above the heaters display, provided that you give the heater a name in the M305 command.

                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

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                • undefined
                  Synapsis
                  last edited by 21 Jan 2018, 12:45

                  Thanks David did not know VSSA was also called AGND…

                  I thought it was a typo error and you wanted to say a GND. πŸ™‚

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                  • undefined
                    Synapsis
                    last edited by 21 Jan 2018, 13:14

                    Not so good I'm getting a reading of 1100,00 .
                    Now if I connect to the main bedheater connector I get the same value as the one there is now.
                    So I know its not the thermistor giving strange readings seeing when connected there it works.
                    Gave it a name etc. I tried different B and R values but nothing it may go a low as 600C.
                    Any ideas as to why itws not giveing correct readings. Connected to Pin 35 and 40 on the expansione bus.

                    This is my setup I copied the first heater 0 settings
                    ; Heaters
                    M305 P0 T100000 B3950 C0 R4700 ; Set thermistor + ADC parameters for heater 0
                    M143 H0 S120 ; Set temperature limit for heater 0 to 120C
                    M305 P1 T100000 B4725 C7.060000e-8 R4700 ; Set thermistor + ADC parameters for heater 1
                    M143 H1 S280 ; Set temperature limit for heater 1 to 280C
                    M305 P103 T100000 B3950 C0 R4700 S"TEMP2" X3

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                    • undefined
                      dc42 administrators
                      last edited by 21 Jan 2018, 16:18

                      I just checked the schematics, and you also need to connect a 4.7K 1% resistor between the thermistor input and ADVREF.

                      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

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                      • undefined
                        Synapsis
                        last edited by 21 Jan 2018, 17:10

                        OK think I'll buy the daughter board πŸ™‚

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