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    Accelerometer Usage

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    • StaticRedundefined
      StaticRed @StaticRed
      last edited by

      @staticred seems like it still did record some data at some point.
      aa562860-14d7-4554-9ac1-8924487b9324-image.png

      But it does not make sense that that is the z axis. Because the board is mounted flat on the toolhead. Really strange

      dc42undefined 1 Reply Last reply Reply Quote 0
      • dc42undefined
        dc42 administrators @StaticRed
        last edited by dc42

        @staticred I will re-test accelerometer with Duet 3 Mini later today or tomorrow.

        What did the raw data look like, before you clicked Analyse?

        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

        StaticRedundefined 1 Reply Last reply Reply Quote 0
        • StaticRedundefined
          StaticRed @dc42
          last edited by

          @dc42 Thank you alot!
          2718ce0e-d153-4dd6-9cea-48819629d1f4-image.png
          This is what the raw data looked like

          dc42undefined 2 Replies Last reply Reply Quote 0
          • dc42undefined
            dc42 administrators @StaticRed
            last edited by dc42

            @staticred the raw data looks OK except for the spikes and drops, assuming that you collected that data while the machine was stationary. My guess is that those spikes/drops were where the firmware was unable to extract the data from the accelerometer fast enough. You can check this by looking at the end of the .csv file to see if there is a message about this. I think the DWC accelerometer plugin may report it too. See the notes at https://duet3d.dozuki.com/Wiki/Accelerometers#Section_Retrieving_the_data to see what you can do about it; or just try re-running it a few times to see if you can get a clean run.

            The analysis isn't valid if the data contains dropouts. To get a useful analysis you need to do a suitable move while the data is being collected as described at https://duet3d.dozuki.com/Wiki/Accelerometers#Section_Using_accelerometers.

            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
            • dc42undefined
              dc42 administrators @StaticRed
              last edited by

              @staticred I just connected a LIS3DH board to my Duet 3 Mini5+ WiFi and it is working as expected. I used connector IO2 to connect the CS and INT lines.

              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

              StaticRedundefined 1 Reply Last reply Reply Quote 0
              • StaticRedundefined
                StaticRed @dc42
                last edited by

                @dc42 thank you for all the infos. I will tomorrow (after upgrading to my new orbiter extruder) solder all the wires to the lis3DH and also make proper connections. Maybe just a faulty cable caused it.

                dc42undefined 1 Reply Last reply Reply Quote 0
                • dc42undefined
                  dc42 administrators @StaticRed
                  last edited by dc42

                  For anyone having problems getting an SPI-connected accelerometer to work:

                  I have found that capacitive coupling between the SDO and CS signals in the cable can cause a glitch on CS when the accelerometer replied to a read register request, and this glitch stops the accelerometer sending any more data. This is especially likely if those two signals, which use adjacent pins on the Adafruit LIS3DH board, use adjacent conductors in a flat cable. I was able to work around this by putting a 1K resistor in series with SDO at the accelerometer end of the cable.

                  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

                  StaticRedundefined 1 Reply Last reply Reply Quote 0
                  • Ducati87undefined
                    Ducati87
                    last edited by

                    I'm having an issue with the connection. I used a CAT7 ethernet cable but nothing works. Every time I try to launch the command, the accelerator is not found. Any suggest about which cable I should use? Thankt you.

                    SIamundefined dc42undefined 2 Replies Last reply Reply Quote 0
                    • SIamundefined
                      SIam @Ducati87
                      last edited by

                      @ducati87 I use a USB3 cable and have no problems since then
                      https://forum.duet3d.com/topic/22878/software-package-3-3beta3-released/68?_=1624809172098

                      Hypercube-Evolution-Hybrid, Piezo Orion, Orbiter
                      Duet WiFi 1.02 or later + DueX5
                      RepRapFirmware for Duet 2 WiFi/Ethernet 3.4.0beta4 (2021-09-27 11:30:36)
                      Duet WiFi Server: 1.26
                      Duet Web Control 3.4.0beta4 (2021-09-27)

                      Ducati87undefined 1 Reply Last reply Reply Quote 0
                      • Ducati87undefined
                        Ducati87 @SIam
                        last edited by

                        @siam Thank you Slam, I will try it 🙂

                        1 Reply Last reply Reply Quote 0
                        • dc42undefined
                          dc42 administrators @Ducati87
                          last edited by

                          @ducati87 said in Accelerometer Usage:

                          I'm having an issue with the connection. I used a CAT7 ethernet cable but nothing works. Every time I try to launch the command, the accelerator is not found. Any suggest about which cable I should use? Thankt you.

                          See my reply immediately before your post.

                          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

                          Ducati87undefined 1 Reply Last reply Reply Quote 0
                          • Ducati87undefined
                            Ducati87 @dc42
                            last edited by

                            @dc42 what do you mean for "in series with SDO at the accelerometer end of the cable"?

                            dc42undefined 1 Reply Last reply Reply Quote 0
                            • dc42undefined
                              dc42 administrators @Ducati87
                              last edited by

                              @ducati87 I mean connect the resistor between the SDO pin of the accelerometer board and the wire that goes to MISO on the Duet, instead of connecting the wire directly to the SDO pin.

                              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

                              Ducati87undefined 2 Replies Last reply Reply Quote 1
                              • Ducati87undefined
                                Ducati87 @dc42
                                last edited by

                                @dc42 perfect thank you!

                                1 Reply Last reply Reply Quote 0
                                • StaticRedundefined
                                  StaticRed @dc42
                                  last edited by

                                  @dc42 i will definetly try that out. I had firstly swap my board because of that early production process. While doing that i also swapped my z axis, now need to reconfigure than, and then can test the lis3dh again.

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                                  • Ducati87undefined
                                    Ducati87 @dc42
                                    last edited by

                                    @dc42 said in Accelerometer Usage:

                                    @ducati87 I mean connect the resistor between the SDO pin of the accelerometer board and the wire that goes to MISO on the Duet, instead of connecting the wire directly to the SDO pin.

                                    in spite of the 1K resistor, the accelerometer is not found. I checked the cable on my duet daughter board and everything seems to be ok. Any suggest? Thank you.

                                    dc42undefined 1 Reply Last reply Reply Quote 0
                                    • dc42undefined
                                      dc42 administrators @Ducati87
                                      last edited by

                                      @ducati87 thanks for trying. I've no more suggestion yet, but I will get back to this when I have time. What sort of cable are you using, and how long is it? Photos of the two ends please.

                                      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

                                      MikeSundefined 1 Reply Last reply Reply Quote 0
                                      • MikeSundefined
                                        MikeS @dc42
                                        last edited by

                                        @dc42 i'm in the same situation as @Ducati87 . Here's the thread where i have asked for help and post a photo of the wiring https://forum.duet3d.com/topic/24099/accelerometer-on-duet2wifi-duex5-expansion/3

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                                        • CCS86undefined
                                          CCS86
                                          last edited by

                                          Same boat here.

                                          M955 P0 >>>> "Accelerometer not found"

                                          M955 P0 C"exp.pa22+exp.pa21" >>>> "Accelerometer not found on specified port"

                                          • Running RRF3.3 Stable

                                          • Wired with a VGA cable. I could probably take about 12" out of the cable length. I left it longer to keep the second ferrite noise filter in place.

                                          4986082c-4969-4222-9f2b-b637da171af1-image.png

                                          42283bc1-9899-4443-85d8-f9e480ac5bd3-image.png

                                          dc42undefined tekstyleundefined 2 Replies Last reply Reply Quote 0
                                          • dc42undefined
                                            dc42 administrators @CCS86
                                            last edited by

                                            @ccs86 I can't see anything wrong with the wiring or configuration command; so I guess it's an issue of cable length. How long is the cable? A 900mm long multicore cable is working OK for me on a Duet WiFi.

                                            Have you tried temporarily unplugging the PT100 daughter board?

                                            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

                                            CCS86undefined 1 Reply Last reply Reply Quote 0
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