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    Auto pressure advance turning by hotend pressure

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    • PenguinAkikoundefined
      PenguinAkiko @PenguinAkiko
      last edited by

      @penguinya 48a290df-8349-4eeb-9fcf-c8a1a74bb18b-image.png
      a1 mini use pcb coil

      T3P3Tonyundefined 1 Reply Last reply Reply Quote 0
      • T3P3Tonyundefined
        T3P3Tony administrators @PenguinAkiko
        last edited by

        @penguinya what inductance are they measuring to determine pressure for pressure advance calibration?

        www.duet3d.com

        o_lampeundefined PenguinAkikoundefined 3 Replies Last reply Reply Quote 0
        • o_lampeundefined
          o_lampe @T3P3Tony
          last edited by o_lampe

          @T3P3Tony
          It's probably the filament that bends in a certain direction when pressure increases. They could design the filament path in such way, that it bends in a predictable way.
          But that would highly depend on the stiffness of the filament and would need a calibration with temp-compensation

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          • PenguinAkikoundefined
            PenguinAkiko @T3P3Tony
            last edited by

            @T3P3Tony Same as the string gauge, it looks like the hotend can move up and down
            6f84109b-f537-495a-ac46-462d8ea48929-image.png
            83099ed6-0c85-4715-8b11-a73b1f3ed096-image.png
            edb5a61c-56cb-4a29-999a-6cc1185fbcc5-image.png

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            • PenguinAkikoundefined
              PenguinAkiko
              last edited by

              RP2040 have two core and fust enough ADC to measure string gauge.
              I think it can save pressure data to calculate pressure curve
              34730d91-ca3f-4e9a-9eef-a10073ccdc18-image.png

              PenguinAkikoundefined 1 Reply Last reply Reply Quote 0
              • PenguinAkikoundefined
                PenguinAkiko @PenguinAkiko
                last edited by

                @penguinya da7bc2c9-8428-444c-aef2-0d8857bed3f9-image.png

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                • PenguinAkikoundefined
                  PenguinAkiko @T3P3Tony
                  last edited by

                  @T3P3Tony found some articles https://airtripper.com/1338/airtripper-extruder-filament-force-sensor-introduction/

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                  • PenguinAkikoundefined
                    PenguinAkiko
                    last edited by

                    15 minutes, 16 seconds to 17 seconds, the hotend moves up and down.
                    https://www.youtube.com/watch?v=EZ3BtQ7k9Ak

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                    • nikschaundefined
                      nikscha
                      last edited by

                      I love the idea!
                      I guess you could write a gcode snippet in daemon.g which continously reads straingauge values and adjusts pressure advance values?
                      Duet can read sensors via SPI, maybe a dedicated "strain gauge sensor" option would be possible? One could also put together a small PCB that amplifies the strain gauge reading into a voltage that can just be read by a linear analog sensor on the Duet?

                      Stay in school

                      PenguinAkikoundefined 1 Reply Last reply Reply Quote 0
                      • PenguinAkikoundefined
                        PenguinAkiko @nikscha
                        last edited by

                        @nikscha macro not fast enough, and this is my idea https://forum.duet3d.com/post/324006

                        nikschaundefined 1 Reply Last reply Reply Quote 0
                        • PenguinAkikoundefined
                          PenguinAkiko
                          last edited by

                          Automated PA testing is still an early idea. I hope to implement z probe and collect enough PA pressure data for research.

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                          • nikschaundefined
                            nikscha @PenguinAkiko
                            last edited by nikscha

                            @penguinya I think it would be fast enough. Just put a "while true" into daemon.g and then a G4 P50 in the body to execute your script every 50ms. (Edit: this wouldn't actually run that frequent, more like 3-6 times a second)

                            I don't think pressure advance needs to be adjusted that often, right?

                            Stay in school

                            PenguinAkikoundefined 2 Replies Last reply Reply Quote 0
                            • PenguinAkikoundefined
                              PenguinAkiko @nikscha
                              last edited by PenguinAkiko

                              @nikscha Bambu Lab tests pa every print, and 50ms really slow, HX711 can reach 80HZ, Prusa using HX717 320HZ, higher the sampling frequency, the more beneficial for auto PA testing.

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                              • PenguinAkikoundefined
                                PenguinAkiko
                                last edited by

                                find a better chip for load cell.
                                CS1237 http://www.asidesigner.com/Files/PartFiles/15315/222/cs1237_datasheet.pdf
                                spi bus 1.28kHz ADC and PGA

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                                • PenguinAkikoundefined
                                  PenguinAkiko @nikscha
                                  last edited by

                                  @nikscha Here is a post about sampling speed
                                  https://forum.duet3d.com/post/251488

                                  1 Reply Last reply Reply Quote 1
                                  • PenguinAkikoundefined
                                    PenguinAkiko
                                    last edited by

                                    https://wiki.bambulab.com/en/a1/manual/intro-a1
                                    6a24e275-8229-41b9-836e-b747de77409f-image.png

                                    PenguinAkikoundefined 1 Reply Last reply Reply Quote 0
                                    • PenguinAkikoundefined
                                      PenguinAkiko @PenguinAkiko
                                      last edited by

                                      @penguinya The introduction of bambulab confirmed my guess.

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                                      • Charlieundefined
                                        Charlie
                                        last edited by

                                        Correct me if Im wrong, but I feel like this sensor could also be used for filament runout/jam detection as well. Like if the force expected by feeding the filament is not produced, it could indicate that there is some filament error.

                                        PenguinAkikoundefined Richard Fundefined 2 Replies Last reply Reply Quote 0
                                        • PenguinAkikoundefined
                                          PenguinAkiko @Charlie
                                          last edited by

                                          @Charlie Yes prusa has implemented it

                                          Charlieundefined MJLewundefined 2 Replies Last reply Reply Quote 0
                                          • Richard Fundefined
                                            Richard F @Charlie
                                            last edited by

                                            @Charlie would a mouse optical sensor work to monitor filament

                                            do we need more than this for a run out trigger Untitled.png

                                            oliofundefined Charlieundefined 2 Replies Last reply Reply Quote 0
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