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    Accelerometer Usage

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    • DIY-O-Sphereundefined
      DIY-O-Sphere @StaticRed
      last edited by DIY-O-Sphere

      @staticred

      Sorry, had to delete my previous post. Now I noticed that you have connected the wires to the temp dautherboard. That looks right to me.

      (UTC+1)

      StaticRedundefined 1 Reply Last reply Reply Quote 0
      • StaticRedundefined
        StaticRed @DIY-O-Sphere
        last edited by

        @diy-o-sphere Ok it now it works,

        Accelerometer 0:0 with orientation 20 samples at 1344Hz with 10-bit resolution

        It worked until i tried to run a test. Then DWC timed out, and now im getting no connection anymore. Same wiring. Really weird.

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

          @staticred said in Accelerometer Usage:

          @diy-o-sphere Ok it now it works,

          Accelerometer 0:0 with orientation 20 samples at 1344Hz with 10-bit resolution

          It worked until i tried to run a test. Then DWC timed out, and now im getting no connection anymore. Same wiring. Really weird.

          That suggests that something is wrong with the interrupt input. Check the connection between INT0 on the LIS3DH and io0.in, and perhaps try using a different IO port.

          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 Nope no chance. I wired it to io1. Same thing. I tested all connections with a multimeter and they work. But sadly my board cant build up a connection to the accelerometer. Is there something like a debug mode, which may teaches me more about what exactly the problem is?

            StaticRedundefined 1 Reply Last reply Reply Quote -1
            • 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
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