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    How can I calibrate the temperature of my bed

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    • droftartsundefined
      droftarts administrators @axiom
      last edited by

      @axiom please post your current config.g. Until we understand if you have PT100 or thermistor, it is difficult to advise you.

      Ian

      Bed-slinger - Mini5+ WiFi/1LC | RRP Fisher v1 - D2 WiFi | Polargraph - D2 WiFi | TronXY X5S - 6HC/Roto | CNC router - 6HC | Tractus3D T1250 - D2 Eth

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      • infiniteloopundefined
        infiniteloop @axiom
        last edited by

        @axiom Moin,

        Thank you for the link. Unfortunately, it isn’t very descriptive, especially concerning the thermal sensors. As far as I understand it, they provide either a thermistor or a PT100, not both. What you get depends on what you order from them. So the problem remains: we don’t know whether your heaters are equipped with thermistors or PT100 sensors.

        Today I would then like to connect the mats to the PT100 daugterboards and then connect the outputs in parallel. Then I want to do the autotune.

        As long as we are not sure what sensors you got, this is a bad idea. Instead, you can try to configure a single heater with a PT100 daughterboard and see what readings you get at room temperature. Please don’t power the heaters at this stage!

        axiomundefined 2 Replies Last reply Reply Quote 0
        • axiomundefined
          axiom @infiniteloop
          last edited by

          @infiniteloop Ok, then I'll wait, but what should I do?

          dc42undefined 1 Reply Last reply Reply Quote 0
          • axiomundefined
            axiom @infiniteloop
            last edited by

            @infiniteloop I just got it now...I should just connect a sensor to the daughterboard and see what is displayed?

            droftartsundefined infiniteloopundefined 2 Replies Last reply Reply Quote 0
            • droftartsundefined
              droftarts administrators @axiom
              last edited by

              @axiom Please post your config.g. It will show what command you are using to get the sensor to show the correct room temperature. This will tell us if it's a thermistor or PT100.

              Ian

              Bed-slinger - Mini5+ WiFi/1LC | RRP Fisher v1 - D2 WiFi | Polargraph - D2 WiFi | TronXY X5S - 6HC/Roto | CNC router - 6HC | Tractus3D T1250 - D2 Eth

              axiomundefined 1 Reply Last reply Reply Quote 0
              • axiomundefined
                axiom @droftarts
                last edited by

                @droftarts

                As discussed, I have now connected the bed sensor to a PT100 daughterboard.
                The console shows 2000 degrees!!!!!

                Here is the current code:Configuration file for Duet WiFi (firmware version 3.3)
                ; executed by the firmware on start-up
                ;
                ; generated by RepRapFirmware Configuration Tool v3.3.10 on Tue Jul 26 2022 17:05:20 GMT+0200 (Mitteleuropäische Sommerzeit)

                ; General preferences
                M575 P1 S1 B57600 ; enable support for PanelDue
                G90 ; send absolute coordinates...
                M83 ; ...but relative extruder moves
                M550 P"Don axoiom" ; set printer name

                ; Network
                M552 S1 ; enable network
                M586 P0 S1 ; enable HTTP
                M586 P1 S0 ; disable FTP
                M586 P2 S0 ; disable Telnet

                ; Drives
                M569 P0 S1 ; physical drive 0 goes forwards
                M569 P1 S1 ; physical drive 1 goes forwards
                M569 P2 S1 ; physical drive 2 goes forwards
                M569 P4 S1 ; physical drive 4 goes forwards
                M569 P3 S1 ; physical drive 3 goes forwards
                M584 X0 Y1 Z2 E4:3 ; set drive mapping
                M350 X16 Y16 Z16 E16:16 I1 ; configure microstepping with interpolation
                M92 X80.00 Y80.00 Z400.00 E420.00:420.00 ; set steps per mm
                M566 X900.00 Y900.00 Z60.00 E120.00:120.00 ; set maximum instantaneous speed changes (mm/min)
                M203 X6000.00 Y6000.00 Z180.00 E1200.00:1200.00 ; set maximum speeds (mm/min)
                M201 X500.00 Y500.00 Z20.00 E250.00:250.00 ; set accelerations (mm/s^2)
                M906 X1800 Y1600 Z1600 E1600:1600 I30 ; set motor currents (mA) and motor idle factor in per cent
                M84 S30 ; Set idle timeout

                ; Axis Limits
                M208 X0 Y0 Z0 S1 ; set axis minima
                M208 X500 Y500 Z500 S0 ; set axis maxima

                ; Endstops
                M574 X1 S1 P"xstop" ; configure switch-type (e.g. microswitch) endstop for low end on X via pin xstop
                M574 Y1 S1 P"ystop" ; configure switch-type (e.g. microswitch) endstop for low end on Y via pin ystop
                M574 Z2 S1 P"zstop" ; configure switch-type (e.g. microswitch) endstop for high end on Z via pin zstop

                ; Z-Probe
                M558 P1 C"zprobe.in" H5 F300 T6000 ; set Z probe type to unmodulated and the dive height + speeds
                G31 P500 X20 Y20 Z2.5 ; set Z probe trigger value, offset and trigger height
                M557 X15:215 Y15:195 S20 ; define mesh grid

                ; Heaters
                M308 S0 P"spi.cs1" Y"rtd-max31865" ; configure sensor 0 as PT100 on pin spi.cs1
                M950 H0 C"bedheat" T0 ; create bed heater output on bedheat and map it to sensor 0
                M307 H0 B1 S1.00 ; enable bang-bang mode for the bed heater and set PWM limit
                M140 H0 ; map heated bed to heater 0
                M143 H0 S120 ; set temperature limit for heater 0 to 120C
                M308 S1 P"e0temp" Y"thermistor" T100000 B4138 ; 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
                M307 H1 B0 S1.00 ; disable bang-bang mode for heater and set PWM limit
                M143 H1 S280 ; set temperature limit for heater 1 to 280C
                M308 S2 P"e1temp" Y"thermistor" T100000 B4138 ; configure sensor 2 as thermistor on pin e1temp
                M950 H2 C"e1heat" T2 ; create nozzle heater output on e1heat and map it to sensor 2
                M307 H2 B0 S1.00 ; disable bang-bang mode for heater and set PWM limit
                M143 H2 S280 ; set temperature limit for heater 2 to 280C

                ; Fans
                M950 F0 C"fan1" Q500 ; create fan 0 on pin fan1 and set its frequency
                M106 P0 S1 H0 T45 ; set fan 0 value. Thermostatic control is turned on
                M950 F1 C"fan0" Q500 ; create fan 1 on pin fan0 and set its frequency
                M106 P1 S1 H1 T45 ; set fan 1 value. Thermostatic control is turned on

                ; Tools
                M563 P0 S"Filament" 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
                M563 P1 S"Stuetzkonstruktion" D1 H2 F0 ; define tool 1
                G10 P1 X0 Y0 Z0 ; set tool 1 axis offsets
                G10 P1 R0 S0 ; set initial tool 1 active and standby temperatures to 0C

                ; Custom settings are not defined

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                • infiniteloopundefined
                  infiniteloop @axiom
                  last edited by

                  @axiom said in How can I calibrate the temperature of my bed:

                  I should just connect a sensor to the daughterboard and see what is displayed?

                  Yep. And I see from your config that you've done that. What temperature readings do you now get from the bed heater at room temperature?

                  axiomundefined 1 Reply Last reply Reply Quote 0
                  • axiomundefined
                    axiom @infiniteloop
                    last edited by

                    @infiniteloop 2000 degrees!!!

                    infiniteloopundefined 1 Reply Last reply Reply Quote 0
                    • infiniteloopundefined
                      infiniteloop @axiom
                      last edited by

                      @axiom said in How can I calibrate the temperature of my bed:

                      2000 degrees!!!

                      That's far off. I would like to have @droftarts takes a look at this - I don't know what readings the daughterboard should produce if connected to a thermistor instead of a PT100.

                      axiomundefined 1 Reply Last reply Reply Quote 0
                      • axiomundefined
                        axiom @infiniteloop
                        last edited by

                        @infiniteloop
                        understand, ask him directly or do I need to contact @droftarts?

                        droftartsundefined 1 Reply Last reply Reply Quote 0
                        • droftartsundefined
                          droftarts administrators @axiom
                          last edited by

                          @axiom cooking dinner at the moment! Can you post a picture of how you have wired the bed temp sensor to the daughterboard and Duet?

                          Ian

                          Bed-slinger - Mini5+ WiFi/1LC | RRP Fisher v1 - D2 WiFi | Polargraph - D2 WiFi | TronXY X5S - 6HC/Roto | CNC router - 6HC | Tractus3D T1250 - D2 Eth

                          infiniteloopundefined 1 Reply Last reply Reply Quote 0
                          • infiniteloopundefined
                            infiniteloop @droftarts
                            last edited by

                            @droftarts said in How can I calibrate the temperature of my bed:

                            cooking dinner at the moment!

                            bon appétit!

                            axiomundefined 1 Reply Last reply Reply Quote 0
                            • axiomundefined
                              axiom @infiniteloop
                              last edited by

                              @infiniteloop daughterboard.jpg matte.jpg

                              infiniteloopundefined 1 Reply Last reply Reply Quote 0
                              • infiniteloopundefined
                                infiniteloop @axiom
                                last edited by

                                @axiom Thx. @droftarts will have a look at the photos … after dinner.

                                axiomundefined 1 Reply Last reply Reply Quote 0
                                • axiomundefined
                                  axiom @infiniteloop
                                  last edited by

                                  @infiniteloop Guten Appetit!

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                                  • dc42undefined
                                    dc42 administrators @axiom
                                    last edited by

                                    @axiom when you measured the resistance of the sensor at 20C using a multimeter, are you sure it read 106 ohms, not 106 kohms? If it's 106 ohms, it's a PT100. If it's 106 kohms, it's a 100K thermistor.

                                    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

                                    axiomundefined 2 Replies Last reply Reply Quote 0
                                    • axiomundefined
                                      axiom @dc42
                                      last edited by

                                      @dc42 You are right, it is 106 kilo ohms and not ohms... sorry for the wrong statement..

                                      Phaedruxundefined infiniteloopundefined 2 Replies Last reply Reply Quote 0
                                      • axiomundefined
                                        axiom @dc42
                                        last edited by

                                        @dc42 wenn i am starting the bed heater it shows "hardware error no sensor" without starting it shows 2000 degrees

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                                        • Phaedruxundefined
                                          Phaedrux Moderator @axiom
                                          last edited by

                                          @axiom said in How can I calibrate the temperature of my bed:

                                          @dc42 You are right, it is 106 kilo ohms and not ohms... sorry for the wrong statement..

                                          So if it's 106 kilo ohms it is a thermistor and should not be connected to the PT100 daughterboard. Connect it to the mainboard instead and change your config.g to use values for a thermistor.

                                          Z-Bot CoreXY Build | Thingiverse Profile

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                                          • infiniteloopundefined
                                            infiniteloop @axiom
                                            last edited by infiniteloop

                                            @axiom

                                            it is 106 kilo ohms and not ohms

                                            Ok, thermistor. So, for a single heater with thermistor, this is what works:

                                            M308 S0 P"bedtemp" Y"thermistor" R4700 T100000 B3950 ; configure sensor 0 as thermistor on pin bedtemp
                                            

                                            Now, you have to decide what to do with four thermistors and four heaters. Let's assume you want to control the bed as a single unit - I've understood that you wired all heaters to "Bed Heat", i.e. this connector:
                                            aa9d2e70-406e-4d33-93b1-89cfa4ec1e8e-image.png
                                            As you have four 24V PSUs, one for each heater, how do you control these? The proper way to do this is to put a SSR (type DC/DC) between the outcome (-) of each PSU and its heater - if you use a single SSR to switch mains power of all PSUs, you risk their early demise: as the signal from "Bed Heat" is pulsed, it switches rapidly between on and off. You can however use the SSR on mains to power the PSUs. How to do this is described in the last paragraph of this link.

                                            Now, the thermistors: You should use all of them for a combined reading. How this works is outlined in the documentation under Using multiple temperature sensors for a single heater.
                                            I tend to recommend solution 1 (connect them in series), but never tried that with 4 thermistors… at 400 kOhm, risk of interference with power signals is high. Maybe a serial/parallel combination is better in this case: two thermistors each in parallel, i.e. connected as pairs in series.

                                            axiomundefined 3 Replies Last reply Reply Quote 0
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