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    Inconsistent results with optical encoder wheel filament sensor

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    Filament Monitor
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    • alankilianundefined
      alankilian @JohnOCFII
      last edited by

      @JohnOCFII The three case parts printed easily at 0.1mm layer height with PLA and printing slowly on my Rostock Max V3.2 with a 0.5 nozzle.

      The only thing is the pin and guide are slightly too short on the Idler part so the bearing can drop off the filament as it moves "up" in the case.

      I just installed it bearing-side in and it's fine.

      If you're able to modify the .step file provided on their github repository, I would go 1mm thicker for these two polygons.

      I can't figure out how to modify a .step using FreeCAD, but it's supposed to be possible. Maybe I need to spend some YouTube time this afternoon.

      SeemeCNC Rostock Max V3 converted to V3.2 with a Duet2 Ethernet Firmware 3.2 and SE300

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      • JohnOCFIIundefined
        JohnOCFII @alankilian
        last edited by

        @alankilian said in Inconsistent results with optical encoder wheel filament sensor:

        Your filament monitor travels inspired me to take the easy route and order the parts for a magnetic filament monitor from filastruder.

        I checked with FilaStruder, and apparently you got the last one.

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        • cdthomas9undefined
          cdthomas9
          last edited by

          Are these discontinued? I'd like to add this to my setup but it's never been back in stock, for months now.

          alankilianundefined JohnOCFIIundefined 2 Replies Last reply Reply Quote 0
          • alankilianundefined
            alankilian @cdthomas9
            last edited by

            @cdthomas9 They are trying to figure out how to get the cases made.

            I don't know what the issue was.

            SeemeCNC Rostock Max V3 converted to V3.2 with a Duet2 Ethernet Firmware 3.2 and SE300

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            • JohnOCFIIundefined
              JohnOCFII @cdthomas9
              last edited by

              @cdthomas9 said in Inconsistent results with optical encoder wheel filament sensor:

              Are these discontinued? I'd like to add this to my setup but it's never been back in stock, for months now.

              Yes, it is an issue with the cases. I think they switched technologies (SLS to injection molded?) and COVID has somewhat slowed the process, or lowered priority.

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              • alankilianundefined
                alankilian
                last edited by

                @JohnOCFII I sent you a chat message with a contact at Duet3d who might be able to help you with a magnetic filament monitor parts kit.

                Let me know if you didn't get the message and how to send it to you.

                SeemeCNC Rostock Max V3 converted to V3.2 with a Duet2 Ethernet Firmware 3.2 and SE300

                JohnOCFIIundefined 1 Reply Last reply Reply Quote 0
                • JohnOCFIIundefined
                  JohnOCFII @alankilian
                  last edited by

                  @alankilian said in Inconsistent results with optical encoder wheel filament sensor:

                  @JohnOCFII I sent you a chat message with a contact at Duet3d who might be able to help you with a magnetic filament monitor parts kit.

                  Let me know if you didn't get the message and how to send it to you.

                  Weird -- I get emails for message updates, but not "chat" updates -- so I hadn't seen that message.

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                  • JohnOCFIIundefined
                    JohnOCFII @alankilian
                    last edited by JohnOCFII

                    @alankilian said in Inconsistent results with optical encoder wheel filament sensor:

                    https://www.digikey.com/en/products/detail/texas-instruments/CD40106BE/376602

                    If you want help wiring it up, let me know.

                    I took the whole week off for Thanksgiving. Time to get back into this.

                    It looks like I connect pin 7 to ground, and pin 14 to 3.3V power.

                    It looks like most of the rest of the pins are paired. I'm not sure if it matters which pairs I use. Looks like I could connect from the optical sensor to Pin 1 (for input) and connect from Pin 2 (for output) to the Duet.

                    Would that be correct?

                    (This from the diagram on page 3) in the PDF below: https://www.ti.com/lit/ds/symlink/cd40106b.pdf?HQS=TI-null-null-digikeymode-df-pf-null-wwe&ts=1606236503315

                    IMG_2052.jpeg

                    alankilianundefined 1 Reply Last reply Reply Quote 0
                    • alankilianundefined
                      alankilian @JohnOCFII
                      last edited by

                      @JohnOCFII That's all correct.

                      It doesn't matter which inverter you use. You just need to make sure to use the input of one inverter and the output of the same inverter of course. 🙂

                      I don't remember what your optical receiver circuit looks like, so you might need either a pull-up or a pull-down on the input to the Schmitt trigger inverter pin #1.

                      You can connect pin #2 directly to the Duet input pin.

                      SeemeCNC Rostock Max V3 converted to V3.2 with a Duet2 Ethernet Firmware 3.2 and SE300

                      JohnOCFIIundefined 1 Reply Last reply Reply Quote 0
                      • JohnOCFIIundefined
                        JohnOCFII @alankilian
                        last edited by

                        @alankilian said in Inconsistent results with optical encoder wheel filament sensor:

                        I don't remember what your optical receiver circuit looks like, so you might need either a pull-up or a pull-down on the input to the Schmitt trigger inverter pin #1.

                        Here are two photos of the optical sensor. Not sure it is clear enough to indicate presence or absence of the pull-up or pull-down resistors.IMG_2055.jpeg
                        IMG_2056.jpeg

                        alankilianundefined 1 Reply Last reply Reply Quote 0
                        • alankilianundefined
                          alankilian @JohnOCFII
                          last edited by

                          @JohnOCFII
                          R1 is a 180 Ohm resistor in series with the emitter LED.
                          R2 is a 2,200 Ohm resistor to pull UP the receiver signal line.

                          The resistor on the top is a 1,000 Ohm resistor in series with the LED on top. Is that a power-on LED?

                          So I would just hook it directly to the input of the Schmitt-inverter. No pull-resistors required on the input or the output of the inverter.

                          SeemeCNC Rostock Max V3 converted to V3.2 with a Duet2 Ethernet Firmware 3.2 and SE300

                          JohnOCFIIundefined 1 Reply Last reply Reply Quote 0
                          • JohnOCFIIundefined
                            JohnOCFII @alankilian
                            last edited by JohnOCFII

                            @alankilian said in Inconsistent results with optical encoder wheel filament sensor:

                            @JohnOCFII
                            R1 is a 180 Ohm resistor in series with the emitter LED.
                            R2 is a 2,200 Ohm resistor to pull UP the receiver signal line.

                            The resistor on the top is a 1,000 Ohm resistor in series with the LED on top. Is that a power-on LED?

                            So I would just hook it directly to the input of the Schmitt-inverter. No pull-resistors required on the input or the output of the inverter.

                            The LED is not a power-on LED -- it lights up when the light beam is broken. Interestingly, there is a corresponding e1stop LED on the Duet board as well.

                            Thanks again on the advice. I'll try to wire this up tomorrow!

                            alankilianundefined 1 Reply Last reply Reply Quote 0
                            • alankilianundefined
                              alankilian @JohnOCFII
                              last edited by

                              @JohnOCFII AH! I tool another look at a larger zoom level and I do see that the LED is connected between positive voltage and the output signal.

                              SeemeCNC Rostock Max V3 converted to V3.2 with a Duet2 Ethernet Firmware 3.2 and SE300

                              1 Reply Last reply Reply Quote 1
                              • JohnOCFIIundefined
                                JohnOCFII
                                last edited by

                                @alankilian

                                Progress!

                                I manually moved the filament back and forth a few times, just to see if I was capture what I expected to capture. Other than the fact that the signal seems inverted -- it definitely looks like the Channel 1 signal is a cleaned up version of Channel 3.

                                Spacing seems somewhat different too, but I can't imagine that matters in this case. I'll do a test print next.

                                Here's the very tiny Saleae log file: https://1drv.ms/u/s!ApuOkxTDmZEzgoHeOopsvsFwqzJ2Eck?e=6bpojT

                                Screen Shot 2020-11-26 at 4.00.34 PM.png

                                alankilianundefined 1 Reply Last reply Reply Quote 0
                                • JohnOCFIIundefined
                                  JohnOCFII
                                  last edited by JohnOCFII

                                  Yeah, maybe that inversion does matter. The LED on the optical sensor now is behaving opposite to the sensor on the DUET e1stop.

                                  Of course, I did buy a Schmitt trigger -inverter-...

                                  https://www.ti.com/lit/ds/symlink/cd40106b.pdf?HQS=TI-null-null-digikeymode-df-pf-null-wwe&ts=1606236503315

                                  alankilianundefined 1 Reply Last reply Reply Quote 0
                                  • JohnOCFIIundefined
                                    JohnOCFII
                                    last edited by

                                    OK - test print complete. I inverted the endstop in my config:

                                    M591 D0 P7 C"!^e1stop" S0 R30:1500 L04.0 E5 A1   
                                    

                                    Once again, this was just a slow vase mode test, but it looked pretty consistent. Now to do a more varied test print.

                                    Pulse-type filament monitor on pin !e1stop, disabled, sensitivity 4.000mm/pulse, allowed movement 30% to 1500%, check every 5.0mm, measured sensitivity 4.048mm/pulse, measured minimum 92%, maximum 107% over 275.3mm
                                    

                                    Here's the Saleae capture: https://1drv.ms/u/s!ApuOkxTDmZEzgoHgcZ3MG-VMfmaWuDk?e=LBB2Ue

                                    John

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                                    • JohnOCFIIundefined
                                      JohnOCFII
                                      last edited by

                                      A "normal" print with varying movement types and speeds up to 120 mm/sec. Results were pretty stable. Very similar to the vase mode print.

                                      Pulse-type filament monitor on pin !e1stop, disabled, sensitivity 4.000mm/pulse, allowed movement 30% to 1500%, check every 5.0mm, measured sensitivity 4.016mm/pulse, measured minimum 91%, maximum 109% over 851.3mm
                                      

                                      That's enough for today.

                                      fractalengineerundefined arhiundefined 2 Replies Last reply Reply Quote 1
                                      • fractalengineerundefined
                                        fractalengineer @JohnOCFII
                                        last edited by fractalengineer

                                        @JohnOCFII brilliant results that is a huge improvement

                                        I actually have a C045 single inverter from my TBS Crossfire mod lol; might give it a shot

                                        https://www.ti.com/lit/ds/symlink/sn74lvc1g04.pdf?ts=1606443533029&ref_url=https%253A%252F%252Fwww.google.com%252F

                                        870165cb-b43e-4506-970f-d8ee4c830034-image.png

                                        Railcore II ZL

                                        JohnOCFIIundefined 2 Replies Last reply Reply Quote 1
                                        • arhiundefined
                                          arhi @JohnOCFII
                                          last edited by arhi

                                          @JohnOCFII said in Inconsistent results with optical encoder wheel filament sensor:

                                          minimum 91%, maximum 109%

                                          awesome 😄

                                          so would be cool if @dc42 can implement sometimes in future Schottky input on the MCU for endstop inputs as it is supported from what I see in the datasheet.

                                          JohnOCFIIundefined 1 Reply Last reply Reply Quote 1
                                          • JohnOCFIIundefined
                                            JohnOCFII @fractalengineer
                                            last edited by

                                            @fractalengineer

                                            Thanks -- my next step is to re-test with the higher resolution encoder wheel. Right now I'm on the "middle" wheel.

                                            IMG_2013.jpeg

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