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    Piezo20 probe and piezo kit now available

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    • dc42undefined
      dc42 administrators
      last edited by

      You can adjust the debounce time by adjusting the threshold in the G31 P parameter. Lower values give lower debounce times.

      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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      • Moriquendiundefined
        Moriquendi
        last edited by

        New boards have arrived and are made up, I'm currently testing them and they should be ready to post early next week.

        Of the the first batch of 12 I've sent out 10 and donated I think £55 to the charity. Unfortunately I'm not in a position to keep doing that, I had to buy more parts to make the new batch and the boards are larger and more expensive so now I'm going to be selling them. If you've already been told that the money is going to the charity then that is where it will go but in the interests of transparency, from this point on, the money is going in my pocket.

        I will be writing up documentation (hopefully this weekend) and I will publish that free for anyone to use.

        I didn't foresee the demand for these boards so I only ordered six this time, I think three or four are already spoken for. I'll be ordering more asap.

        I've previously discussed a piezo endstop handling board, they are also made up and being tested and will be ready to post next week to beta testers.

        Idris

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        • DjDemonDundefined
          DjDemonD
          last edited by

          Idris. That's great news. I think it might be a good idea to possibly start a wiki page on reprap for this system as it is coming together nicely, and all the relevant information such as how to use the board and how to assemble the units would be well placed.

          David - I will experiment with this. I have been setting the P parameter dependant on the analogue value but it might be worth revisiting the digital setup as it does seem to work extremely well on smoothie as a digital sensor with 1ms debounce.

          Simon. Precision Piezo Z-Probe Technology
          www.precisionpiezo.co.uk
          PT1000 cartridge sensors NOW IN, just attach to your Duet board directly!

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          • DjDemonDundefined
            DjDemonD
            last edited by

            Okay so this is the current incarnation of the sensor mounted in Lykle's latest effector system (which will be able to have a Nimble extruder bolted straight on - or just used with your current Bowden/flying extruder):

            Nozzle wobbly practically non-existent and calibrating to a 0.02 precision over a 330mm bed.

            Simon. Precision Piezo Z-Probe Technology
            www.precisionpiezo.co.uk
            PT1000 cartridge sensors NOW IN, just attach to your Duet board directly!

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            • DjDemonDundefined
              DjDemonD
              last edited by

              I have the stl's for this effector now on my thingiverse. Lykle will publish it also (with step files) if anyone needs to edit it to suit their setup. Please feedback to us on how you are getting on with it, any additions and improvement you make as well.

              http://www.thingiverse.com/thing:2069480

              Simon. Precision Piezo Z-Probe Technology
              www.precisionpiezo.co.uk
              PT1000 cartridge sensors NOW IN, just attach to your Duet board directly!

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              • Dougal1957undefined
                Dougal1957
                last edited by

                DJ did you get his larger one I sent you you will need that to go with the Alloy carriages that I am getting cut it has a hole to take the Bardair cooling tube integrated into it (Reminder to self to order a bardAir system)

                Doug

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                • DjDemonDundefined
                  DjDemonD
                  last edited by

                  Thanks Doug, I did get it yet. I will reprint and upgrade the effector when the carriages are in. I am looking forward to that.

                  Simon. Precision Piezo Z-Probe Technology
                  www.precisionpiezo.co.uk
                  PT1000 cartridge sensors NOW IN, just attach to your Duet board directly!

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                  • DjDemonDundefined
                    DjDemonD
                    last edited by

                    This seems to be a nice way to use the probe for automatic perfect first layers:
                    https://www.duet3d.com/forum/thread.php?id=940

                    Simon. Precision Piezo Z-Probe Technology
                    www.precisionpiezo.co.uk
                    PT1000 cartridge sensors NOW IN, just attach to your Duet board directly!

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                    • Zesty_Lykleundefined
                      Zesty_Lykle
                      last edited by

                      Yes, DJDemonD did a great job there, getting it done.

                      I published the designs on our Thingiverse page as well. http://www.thingiverse.com/thing:2117069
                      Included is a 64mm wide effector and a Prism effector, which is the standard Kossel type width, but pretty looking. (I think)

                      All three effectors already have holes in them for a Bard-air type cooling pipe.

                      Lykle
                      Design, make and enjoy life

                      Co Creator of the Zesty Nimble

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                      • Moriquendiundefined
                        Moriquendi
                        last edited by

                        I'm writing up documentation for these new boards, does anyone know whether the inputs of the Duet are 5V tolerant?

                        Idris

                        Edit: Tuning instructions for the Z-probe v2 board are here https://www.dropbox.com/sh/3q38ew98kt7f8sq/AAB_uA6tQL2ETlGcnfdijm2Ra?dl=0, feedback would be very welcome, particularly from anyone whose using a v1 board.

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                        • dc42undefined
                          dc42 administrators
                          last edited by

                          Although they are fairly tolerant of over-voltage, the Duet inputs should not be fed more than 3.3V under normal operating conditions. If you power your interface board from the 3.3V supply provided on the Z probe connector, all will be well.

                          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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                          • Moriquendiundefined
                            Moriquendi
                            last edited by

                            I thought that would be the case. The reason I ask is that I'm using a Smoothieboard which uses 5v IO. The board specifies 5v power so I'd hate for someone to give it 5v then plug it into the Duet and fry something. I don't have a 3.3v powersupply so I can't test the boards on 3.3v, nobody reported any problems with the v1 at 3.3v.

                            Idris

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                            • DjDemonDundefined
                              DjDemonD
                              last edited by

                              Moriquendi, I'm using your one-Piezo board at 3.3v on duetwifi with no issue.

                              Simon. Precision Piezo Z-Probe Technology
                              www.precisionpiezo.co.uk
                              PT1000 cartridge sensors NOW IN, just attach to your Duet board directly!

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                              • kraegarundefined
                                kraegar
                                last edited by

                                Got my piezos today, a test fit is perfect, though I may need to get creative to insulate the edges of the copper from the retaining screws. I plan to use some nylon washers to insulate it from the mount plates, we'll see what I can come up with there.

                                I'll probably cut some small notches in the copper plate and put an insulator around the m3 screws.

                                http://imgur.com/hdlaqlQ

                                Looking forward to getting the board from Moriquendi so I can try it out.

                                Co-Creator of the RailcoreII CoreXY printer
                                https://www.thingiverse.com/thing:2407174

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                                • briangilbertundefined
                                  briangilbert
                                  last edited by

                                  @dc42

                                  What are the chances of this sensor also being used as a crash sensor during prints?

                                  Co-creator of the Zesty Nimble direct drive extruder

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                                  • dc42undefined
                                    dc42 administrators
                                    last edited by

                                    @briangilbert:

                                    @dc42

                                    What are the chances of this sensor also being used as a crash sensor during prints?

                                    That depends on whether the sensor has any tendency to trigger during normal printing.

                                    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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                                    • leadinglightsundefined
                                      leadinglights
                                      last edited by

                                      As most firmware does not look at the sensor other than when probing this does not normally create a problem. However, the LED on the piezo sensor boards on my 3D printers flash a lot during printing so there is signal to work with. If the amplifier put out an analogue signal instead of a logic one then perhaps the firmware could be set to look for error indicating values.

                                      Mike

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                                      • DjDemonDundefined
                                        DjDemonD
                                        last edited by

                                        Well whether it's designed to or not it does put out an analogue signal. I can read from 216 to 1000 on the duet web control depending on rate of pressure change on the piezo. It's goes to around 500 during rapid moves or over rough previous layers. I set 600-700 as a trigger level for probing.

                                        But even then what would we use as a stop trigger? 1000? Maybe a slowdown to half speed at 700 then gradual increase back to normal at the next layer? It would be interesting to develop as its not been done before that I am aware of.

                                        700 equate to 15g of force on probing, I'll set 1000 (or 999) probing threshold and stick the scales under the nozzle.

                                        Simon. Precision Piezo Z-Probe Technology
                                        www.precisionpiezo.co.uk
                                        PT1000 cartridge sensors NOW IN, just attach to your Duet board directly!

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                                        • Moriquendiundefined
                                          Moriquendi
                                          last edited by

                                          I'm on holiday at the moment but when I get home I'll dig out the protoboard version of the circuit and have a look at the output of the differentiator section on an oscilloscope during a print. The output of the differentiator should be an analog signal proportional to, in my case, movement of the bed.

                                          If anyone has access to a 'scope you're looking at either pin 1or pin 9 of the IC or the centre most end of either C1 or R3

                                          Idris

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                                          • DjDemonDundefined
                                            DjDemonD
                                            last edited by

                                            So a bit of experimenting.
                                            Set the probe to digital in config.g using
                                            M558 P5 I1 F500 X0 Y0 Z0
                                            G31 X0 Y0 Z0 P100

                                            And in this mode (I am using inverted setup for piezo board (active low), if you are using active high then remove I1) the G31 P100 is the debounce which filters the signal, so using this config I can probe at normal speed/jerk/accel which brings the probe performance into line with that on smoothieware, which has debounce parameter also.

                                            However in this mode I think it would be less easy/not possible to use data from the probe for crash detection/quality improvement as discussed above by briangilbert, unless we take a feed from the pins Moriquendi suggested above and connect them to a spare analogue input on the duet. And then there is some coding required.

                                            Here is it probing at normal speed:
                                            https://youtu.be/MURqDTL9oVA

                                            Simon. Precision Piezo Z-Probe Technology
                                            www.precisionpiezo.co.uk
                                            PT1000 cartridge sensors NOW IN, just attach to your Duet board directly!

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