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    Reading negative temperature and N/A temp

    Duet Hardware and wiring
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    • johny
      johny last edited by

      Hello,
      After wiring all (duet 2 wifi v1.04) i get the following temp reading:
      image
      what whould it be? i already changed the B value from the gcode, re-wire, it doesn't change.
      Thank you

      1 Reply Last reply Reply Quote 0
      • Danal
        Danal last edited by

        -273.1 is the "magic number" that indicates a totally open circuit on an input configured for a thermistor. So you have a broken wire, are plugged into the wrong input, or similar.

        johny 1 Reply Last reply Reply Quote 0
        • johny
          johny @Danal last edited by johny

          @Danal Thank you for your help; even without anything plugged i get the "magic number", what should this indicate?
          What about the n/a one?
          Thank you

          A Former User Danal 2 Replies Last reply Reply Quote 0
          • A Former User
            A Former User @johny last edited by

            @johny said in Reading negative temperature and N/A temp:

            even without anything plugged i get the "magic number", what should this indicate?

            that your thermistor isn't properly connected when you think its connected.

            1 Reply Last reply Reply Quote 1
            • Danal
              Danal @johny last edited by

              @johny said in Reading negative temperature and N/A temp:

              @Danal Thank you for your help; even without anything plugged i get the "magic number", what should this indicate?
              What about the n/a one?
              Thank you

              even without anything plugged i get the "magic number"

              That is exactly what it means: Open circuit; nothing plugged in.

              Not sure about the N/A

              1 Reply Last reply Reply Quote 0
              • jay_s_uk
                jay_s_uk last edited by

                @johny
                What type of thermistors are you connecting and where are you connecting them?

                Please also post your config.g file

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                • johny
                  johny last edited by

                  Hello,
                  For the heat bed it is the standard thermistors from Chinese heat beds, for the hot end its the one: ATC Semitec 104GT-2/104NT-4-R025H42G (http://www.atcsemitec.co.uk/gt-2-glass-thermistors.html )

                  Gcode:

                  ; Heaters
                  M307 H0 B0 S1.00
                  M305 P0 R4700 T100000 B4267 C0.0000000706
                  M143 H0 S130
                  M305 P1 R4700 T100000 B4267 C0.0000000706
                  M305 P2 R4700 T100000 B4725 C0.0000000706
                  M143 H1 S275

                  ; Fans
                  M106 P0 S0 I0 F500 H-1
                  M106 P1 S1 I0 F500 H1 T45
                  M106 P2 S1 I0 F500 H-1

                  ; Tools
                  M563 P0 D0 H1 F0 ; define tool 0
                  G10 P0 X0 Y0 Z0 ; set tool 0 axis offsets
                  G10 P0 R0 S0 ; set initial tool 0 active and standby temperatures to 0C

                  ; Custom settings are not defined

                  ; Miscellaneous
                  M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000"
                  T0 ; select first tool

                  1 Reply Last reply Reply Quote 0
                  • jay_s_uk
                    jay_s_uk last edited by

                    @johny

                    Apart from having 3 thermistors setup with only 2 heaters, nothing jumps out at me as being odd.
                    Could you take a photo of where you are connecting the thermistors?

                    1 Reply Last reply Reply Quote 0
                    • johny
                      johny last edited by johny

                      Regarding to where i am connecting them its according to the wiring, also it is printed in the board E0 temp and bed heater :

                      bead heater

                      hot end heater

                      Edit: i tried to connect to the E1 thermistor as well to check if it works that's why it have 3 thermistors setup

                      1 Reply Last reply Reply Quote 0
                      • jay_s_uk
                        jay_s_uk last edited by

                        @johny

                        Is the second image correct? that you are attaching the thermistor to the green terminals?

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                        • johny
                          johny last edited by

                          no sorry! In that i plug the heater, the thermistor is bellow
                          alt text

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                          • jay_s_uk
                            jay_s_uk last edited by

                            I would set the values to the following

                            M305 P0 T10000 B3950 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
                            

                            The P0 is a generic 3950 which is what tends to be used by chinese suppliers.
                            The P1 is correct for a 104GT

                            I would remove the P2 as this is probably confusing things.

                            If you're still getting no values, I would revisit your crimping

                            1 Reply Last reply Reply Quote 0
                            • johny
                              johny last edited by

                              I did those changes and i even solder a pair of wires directly to the bed thermistor to bypass any broken cable, the magic number is still there.
                              Probably is something burn in the board, what could it be?
                              Thank you

                              1 Reply Last reply Reply Quote 0
                              • jay_s_uk
                                jay_s_uk last edited by

                                You could try remapping the bed thermistor to P2 and connecting to the e1 temp header and see if you get a reading

                                1 Reply Last reply Reply Quote 0
                                • johny
                                  johny last edited by

                                  I did it, no luck, still same error :S
                                  I unplugged a thermistor from another printer to check it if was the thermistor and the same result.

                                  1 Reply Last reply Reply Quote 0
                                  • A Former User
                                    A Former User last edited by A Former User

                                    (Don't think there is one)
                                    1 Reply Last reply Reply Quote 0
                                    • johny
                                      johny last edited by

                                      @bearer said in Reading negative temperature and N/A temp:

                                      (Don't think there is one)

                                      Well i measure between the vssa and gnd and i got 3 ohms.
                                      I just checked that my heat bed had a short between the +12v and gnd but i got no readings even before plugging it.

                                      1 Reply Last reply Reply Quote 0
                                      • blt3dp
                                        blt3dp last edited by

                                        What version of the firmware does M115 report? Might be useful in troubleshooting.

                                        1 Reply Last reply Reply Quote 0
                                        • johny
                                          johny last edited by

                                          @blt3dp said in Reading negative temperature and N/A temp:

                                          M115

                                          M115
                                          FIRMWARE_NAME: RepRapFirmware for Duet 2 WiFi/Ethernet FIRMWARE_VERSION: 3.0 ELECTRONICS: Duet WiFi 1.02 or later FIRMWARE_DATE: 2020-01-03b3

                                          blt3dp 1 Reply Last reply Reply Quote 0
                                          • blt3dp
                                            blt3dp @johny last edited by

                                            @johny said in Reading negative temperature and N/A temp:

                                            FIRMWARE_VERSION: 3.0

                                            That's why you're not getting a reading, you need have to define the pin that it's using.

                                            jay_s_uk 1 Reply Last reply Reply Quote 0
                                            • jay_s_uk
                                              jay_s_uk @blt3dp last edited by jay_s_uk

                                              @johny

                                              Use

                                              ; Bed Heater
                                              M308 S0 P"bedtemp" Y"thermistor" T100000 B3950 C0 R4700				; Set thermistor + ADC parameters for heater 0
                                              M950 H0 C"bedheat" T0                               		; create bed heater output on bedheat and map it to sensor 0
                                              M307 H0 B0 S1.00
                                              M140 H0
                                              M143 H0 S130                               					; Set temperature limit for heater 0 to 120C
                                              
                                              ; Extruder Heater
                                              M308 S0 P"eotemp" Y"thermistor" T100000 B4275 C7.060000e-8  R4700							;
                                              M950 H1 C"e0heat" T1                                		; create nozzle heater output on e0heat and map it to sensor 1
                                              M143 H1 S400     
                                              
                                              blt3dp 1 Reply Last reply Reply Quote 0
                                              • blt3dp
                                                blt3dp @jay_s_uk last edited by blt3dp

                                                @jay_s_uk said in Reading negative temperature and N/A temp:

                                                @johny

                                                Use

                                                ; Bed Heater
                                                M308 S0 P"bedtemp" Y"thermistor" T100000 B3950 C0 R4700				; Set thermistor + ADC parameters for heater 0
                                                M950 H0 C"bedheat" T0                               		; create bed heater output on bedheat and map it to sensor 0
                                                M307 H0 B0 S1.00
                                                M140 H0
                                                M143 H0 S130                               					; Set temperature limit for heater 0 to 120C
                                                
                                                ; Extruder Heater
                                                M308 S0 P"eotemp" Y"thermistor" T100000 B4275 C7.060000e-8  R4700							;
                                                M950 H1 C"e0heat" T1                                		; create nozzle heater output on e0heat and map it to sensor 1
                                                M143 H1 S400     
                                                

                                                Yep, use that. In fact, looks like you're either modifying or creating a new config file based off of a RRF2x one. You might want to run through the web configurator and generate one for RRF3

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                                                • johny
                                                  johny last edited by

                                                  I used and got a different error!
                                                  fault on thermistor

                                                  1 Reply Last reply Reply Quote 0
                                                  • johny
                                                    johny last edited by

                                                    cant detect sensor

                                                    1 Reply Last reply Reply Quote 0
                                                    • blt3dp
                                                      blt3dp last edited by blt3dp

                                                      Most likely your tool settings. Update these secttions.

                                                      ; Heaters
                                                      M308 S0 P"bedtemp" Y"thermistor" T100000 B4267 C7.06e-8 ; configure sensor 0 as thermistor on pin bedtemp
                                                      M950 H0 C"bedheat" T0                                   ; create bed heater output on bedheat and map it to sensor 0
                                                      M143 H0 S130                                            ; set temperature limit for heater 0 to 130C
                                                      M307 H0 B0 S1.00                                        ; disable bang-bang mode for the bed heater and set PWM limit
                                                      M140 H0                                                 ; map heated bed to heater 0
                                                      M308 S1 P"e0temp" Y"thermistor" T100000 B4267 C7.06e-8  ; configure sensor 1 as thermistor on pin e0temp
                                                      M950 H1 C"e0heat" T1                                    ; create nozzle heater output on e0heat and map it to sensor 1
                                                      M143 H1 S275                                            ; set temperature limit for heater 1 to 275C
                                                      M307 H1 B0 S1.00                                        ; disable bang-bang mode for heater  and set PWM limit
                                                      
                                                      ; Tools
                                                      M563 P0 D0 H1 F0                                        ; define tool 0
                                                      G10 P0 X0 Y0 Z0                                         ; set tool 0 axis offsets
                                                      G10 P0 R0 S0                                            ; set initial tool 0 active and standby temperatures to 0C
                                                      
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