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Filament monitor using HC-020K encoder

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Filament Monitor
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  • undefined
    paboman
    last edited by 17 Mar 2018, 10:46

    Ok I have wired the sensor to the E0 stop and configured as follow:
    [c]; Filament Monitor HC-020K
    M591 D0 P7 C3 S1 R70:130 L24.8 E3.0 ; Duet3D rotating magnet sensor for extruder drive 0 is connected to E0 endstop input, 7 = pulse-generating, sensorsensitivity 24.8mm.rev, 70% to 130% tolerance, 3mm detection length
    M591 D0 ; display filament sensor parameters for extruder drive 0
    [/c]

    For testing purpose the encoder is temporary mounted to the estruder stepper so I can easily simulate the encoder stop reading
    The L value has not been calculated yet so its 24.8mm/rev for now
    https://youtu.be/skg_SJgsGZk

    Sending M591 D0 I get:
    [c]M591 D0
    Pulse-type filament monitor on endstop input 3, sensitivity 1.00mm/pulse, check every 3.0mm, tolerance 70.0%, no data received[/c]

    What should I do next to test or calibrate it ?
    My idea is to run a print without filament then move away the encoder from the wheel to simulate a filament jamming, I expect it to pause the print.

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    • undefined
      dc42 administrators
      last edited by 17 Mar 2018, 14:21

      To calibrate it, run a print (with filament). Send M591 D0 to get the calibration data. You can do this as it is printing, as often as you want. To restart accumulating calibration data, pause and then resume the print.

      Note, the support for pulse-type filament sensor is experimental. I don't have a sensor of that type, so it is very likely that it doesn't work. If you can provide feedback on any issues you encounter, I may be able to include fixes in the 1.21 firmware release.

      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
        paboman
        last edited by 17 Mar 2018, 14:53

        Actually I cant run a print with filament because my test setup is like in the video I made https://youtu.be/skg_SJgsGZk
        but the duet think its reading the filament so should be good for gathering data.

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        • undefined
          paboman
          last edited by 17 Mar 2018, 15:09

          Progress update:
          I have changed the tolerance from 70 to 50%
          As you can see in the new video https://youtu.be/pRrZK0OoPBg I am running a print, E0 stop led is blinking as the encoder send pulses but duet is telling me: No data received.

          [c]M591 D0
          Pulse-type filament monitor on endstop input 3, sensitivity 1.00mm/pulse, check every 3.0mm, tolerance 50.0%, no data received[/c]

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          • undefined
            dc42 administrators
            last edited by 17 Mar 2018, 15:50

            It could be that your sensor pulls the endstop input low enough to light the LED but not low enough to register as low in the processor. Use the Machine Properties tab of DWC to check whether the detected state of that input changes as the wheel rotates and the LED turns on and off.

            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
              paboman
              last edited by 17 Mar 2018, 16:14

              In the DWC the E0 is triggered correctly, it change its state from NO to YES as I rotate the encoder wheel

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              • undefined
                dc42 administrators
                last edited by 17 Mar 2018, 17:20

                Thanks. I found the first bug in support for pulsed filament sensors. Please try the firmware at https://www.dropbox.com/s/iq9pzfaugyfei7x/Duet2CombinedFirmware.bin?dl=0.

                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
                  paboman
                  last edited by 17 Mar 2018, 18:05

                  Installed the firmware 1.21RC5+ (2018-03-17 build 1) apparently nothing has changed.
                  Still [c]M591 D0
                  Pulse-type filament monitor on endstop input 3, sensitivity 1.00mm/pulse, check every 3.0mm, tolerance 50.0%, no data received[/c]
                  https://youtu.be/nitZGkwWn7s

                  Maybe something wrong with my conf.g ?

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                  • undefined
                    dc42 administrators
                    last edited by 17 Mar 2018, 18:18

                    Did you get that report after the wheel had spun a few times and the LED flashed off and on?

                    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
                      paboman
                      last edited by 17 Mar 2018, 18:34

                      yes, after 30 min of printing the report is the same

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                      • undefined
                        dc42 administrators
                        last edited by 17 Mar 2018, 22:17

                        I've rewritten the pulsed filament monitor support based on the code for the rotating magnet sensor, which is know to be working. Also I have changed the configuration parameters to be the same as for the rotating magnet sensor. You are welcome to try it (it's at https://www.dropbox.com/s/iq9pzfaugyfei7x/Duet2CombinedFirmware.bin?dl=0)), but as I haven't had time to test it yet I don't expect it to work.

                        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
                          paboman
                          last edited by 17 Mar 2018, 22:30

                          I have just upgraded the firmware, should I change something in my config.g ?
                          Right now i have :
                          [c]; Filament Monitor HC-020K
                          M591 D0 P7 C3 S1 R70:130 L24.8 E3.0 ; Duet3D rotating magnet sensor for extruder drive 0 is connected to E0 endstop input, 7 = pulse-generating, sensorsensitivity 24.8mm.rev, 50% to 130% tolerance, 3mm detection length
                          M591 D0 ; display filament sensor parameters for extruder drive 0[/c]

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                          • undefined
                            paboman
                            last edited by 17 Mar 2018, 22:32

                            now after the prints begins i get : [c]Extruder 0 reports too little movement[/c]

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                            • undefined
                              paboman
                              last edited by 17 Mar 2018, 22:50

                              Upgraded to:
                              1.21RC5+ (2018-03-17 build 2)

                              I have changed my settings in config.g to:

                              [c]; Filament Monitor HC-020K
                              M591 D0 P7 S23.5 C3 R50 E3.0 ; Duet3d sensor for extruder drive 0 is connected to endstop input 3 (E0), S=23.5mm/rev, R=50% error detection tolerance, C=3mm comparison length

                              M591 D0 ; display filament sensor parameters for extruder drive 0[/c]

                              Still getting [c]Extruder 0 reports too little movement[/c]

                              the strange thing is that The S parameters is set to 23.5 while after M591 D0 I get :
                              [c]M591 D0
                              Pulse-type filament monitor on endstop input 3, enabled, sensitivity 28.80mm/pulse, allowed movement 50% to 160%, check every 3.0mm, current position 0.0, no calibration data[/c]
                              the S parameter is 28.8 instead of 23.5

                              I will be more than happy to send you one HC-020K encoder, just send me the adress to info@3dbnz.com and on Monday UPS will collect the parcel.

                              in the mean time, thank you

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                              • undefined
                                paboman
                                last edited by 17 Mar 2018, 23:15

                                setting the sensitivity very low to 0.2 makes the print goes thru
                                then issuing M591 D0
                                I get [c]Pulse-type filament monitor on endstop input 3, disabled, sensitivity 28.80mm/pulse, allowed movement 20% to 160%, check every 3.0mm, current position 0.0, measured sensitivity 160.73mm/pulse, measured minimum 0%, maximum 2877% over 63648.7mm [/c]
                                so i set S value to 160 but then i get again:
                                [c]Extruder 0 reports too little movement[/c]
                                and the printer go to pause

                                PS
                                while the S is 0.2 there is no difference if I remove the sensor from the wheel, the print does not go to pause

                                Why M591 D0 is telling me [c]disabled[/c] ?

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                                • undefined
                                  dc42 administrators
                                  last edited by 18 Mar 2018, 07:17

                                  As I said, I brought the parameters into line with the other filament monitors. So S now enables or disables filament monitoring, and L sets the sensitivity. See https://duet3d.dozuki.com/Wiki/Gcode#Section_M591_Configure_filament_sensing.

                                  You will probably need to increase the E parameter.

                                  160mm/pulse sounds far too high. Can you measure it?

                                  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
                                    paboman
                                    last edited by 18 Mar 2018, 08:08

                                    what P parameter should I use?
                                    still P7 for pulse-generating sensor or P3 for rotating magnet sensor ?

                                    One complete rotation of the wheel is 20 pulses
                                    Encoder wheel diameter is 26mm
                                    E0 stepes per mm is 1166 ( 13to1 gearbox ratio)

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                                    • undefined
                                      dc42 administrators
                                      last edited by 18 Mar 2018, 09:04

                                      Strill P7.

                                      Are you saying that 26mm filament movement give 20 pulses? If so that's 1.3mm per pulse.

                                      I've put a new firmware binary with more sensible default values at https://www.dropbox.com/s/iq9pzfaugyfei7x/Duet2CombinedFirmware.bin?dl=0.

                                      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
                                      • undefined
                                        paboman
                                        last edited by 18 Mar 2018, 09:22

                                        Diameter of the encoder wheel is 26mm so the circumference is 26 x 3.1416 = 81.7 mm
                                        So 81.7mm of extruded filament is one full turn of the encoder wheel which gives 20 pulses
                                        81.7 / 20 = 4
                                        if so 4mm per pulse

                                        upgraded to: 1.21RC5+ (2018-03-18 build 1)

                                        with this config.g:
                                        [c]; Filament Monitor HC-020K
                                        M591 D0 P7 C3 S0 R70:130 L4.1 E50 ; D= sensor for extruder drive 0, C= E0 endstop input, P=Sensor type, S1= Enable, R=70% to 130% tolerance, L= mm/pulse, E= detection length
                                        M591 D0 ; display filament sensor parameters for extruder drive 0[/c]

                                        i get this response:
                                        [c]10:16:26M591 D0
                                        Pulse-type filament monitor on endstop input 3, disabled, sensitivity 4.10mm/pulse, allowed movement 70% to 130%, check every 50.0mm, current position 0.0, measured sensitivity 12778.21mm/pulse, measured minimum 0%, maximum 33% over 1763392.6mm
                                        10:14:15M591 D0
                                        Pulse-type filament monitor on endstop input 3, disabled, sensitivity 4.10mm/pulse, allowed movement 70% to 130%, check every 50.0mm, current position 0.0, measured sensitivity 12296.81mm/pulse, measured minimum 0%, maximum 25% over 479575.5mm[/c]

                                        If I enable the monitor with S1 i get "Extruder 0 reports too little movement":
                                        [c]10:18:18Printing paused
                                        10:18:17Resume-after-power-fail state saved
                                        10:18:16M591 D0
                                        Pulse-type filament monitor on endstop input 3, enabled, sensitivity 4.10mm/pulse, allowed movement 70% to 130%, check every 50.0mm, current position 0.0, measured sensitivity 25.00mm/pulse, measured minimum 16%, maximum 16% over 50.0mm[/c]

                                        The strange thing is the measured sensitivity of 12778.21mm/pulse while monitor is disabled

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                                        • undefined
                                          dc42 administrators
                                          last edited by 18 Mar 2018, 09:31

                                          So the filament runs on the outside of the 26mm diameter encoder wheel?

                                          The measured sensitivity is clearly absurd, as is the recorded extrusion amount (1.76km in the first report). I'll take another look at the code.

                                          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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