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    Accelerometer Usage

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    • CCS86undefined
      CCS86
      last edited by

      @dc42 said in Accelerometer Usage:

      @ccs86 that looks better. Alternatively, connect all the accelerometer wires to the connector on top of the PT100 board.

      Edit: I think you may have the orange and dashed green wires crossed.

      I can test that configuration when my bench system is free again.

      Do you have a complete pinout for the installed daughterboard? I wasn't able to find one on the wiki.

      When you say "crossed", do you just mean mis-matched to the M955 P0 C"twd0+twck0"?

      So I could physically swap the wires, or update to M955 P0 C"twck0+twd0"?

      dc42undefined 1 Reply Last reply Reply Quote 0
      • dc42undefined
        dc42 administrators @CCS86
        last edited by

        @ccs86 said in Accelerometer Usage:

        So I could physically swap the wires, or update to M955 P0 C"twck0+twd0"?

        yes.

        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

        TheBasedDogeundefined CCS86undefined 2 Replies Last reply Reply Quote 0
        • TheBasedDogeundefined
          TheBasedDoge @dc42
          last edited by TheBasedDoge

          I am trying to setup the Adafruit LIS3DH Accelerometer with no luck so far. I have the Duet2 Wifi. I think that it is connected, light is on, and i didn't get an error in the log for it not being able to connect, but I am not getting any data. I am getting a drive error in the log:

          Untitled.png

          dc42undefined 1 Reply Last reply Reply Quote 0
          • CCS86undefined
            CCS86 @dc42
            last edited by

            @dc42 said in Accelerometer Usage:

            @ccs86 said in Accelerometer Usage:

            So I could physically swap the wires, or update to M955 P0 C"twck0+twd0"?

            yes.

            740fec49-4d0e-4185-b59a-ae88cda0d353-image.png

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

              @thebaseddoge use P0 in your M956 command (same as in your M955 command), not P124.0.

              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 1
              • dc42undefined
                dc42 administrators @CCS86
                last edited by

                @ccs86 it's probably a wiring issue. A few days go I updated the wiring instructions at https://duet3d.dozuki.com/Wiki/Accelerometers#Section_Direct_SPI_connection_to_a_Duet_main_board. The first photo in that section is the 1m long cable that I used successfully to connect the Adafruit board to the Maestro.

                You might like to try connecting the accelerometer to the Duet first using short jumper wires. When you have that working, you can try the same connections with a longer cable, taking care to keep the CS wire away from the other signal wires.

                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
                • CCS86undefined
                  CCS86 @dc42
                  last edited by

                  @dc42 said in Accelerometer Usage:

                  @ccs86 it's probably a wiring issue. A few days go I updated the wiring instructions at https://duet3d.dozuki.com/Wiki/Accelerometers#Section_Direct_SPI_connection_to_a_Duet_main_board. The first photo in that section is the 1m long cable that I used successfully to connect the Adafruit board to the Maestro.

                  You might like to try connecting the accelerometer to the Duet first using short jumper wires. When you have that working, you can try the same connections with a longer cable, taking care to keep the CS wire away from the other signal wires.

                  Could you tell us what wires are considered signal wires?

                  I can try short jumpers, but I feel very good about my wiring. This was a fresh piece of CAT6 off the spool, all terminals crimped with a proper tool (EDM jaws), and it is the minimum length needed (shorter than 1 m).

                  Is the 1k resistor still benefiting my setup?

                  1 Reply Last reply Reply Quote 0
                  • tekstyleundefined
                    tekstyle @CCS86
                    last edited by

                    @ccs86

                    is there any reason to use VIN instead of the 3V pin on the LIs3DH module?

                    CCS86undefined 1 Reply Last reply Reply Quote 0
                    • CCS86undefined
                      CCS86 @tekstyle
                      last edited by

                      @tekstyle said in Accelerometer Usage:

                      @ccs86

                      is there any reason to use VIN instead of the 3V pin on the LIs3DH module?

                      Yes, because that is a 3V output.

                      The V_in pin can take a 3-5V input.

                      1 Reply Last reply Reply Quote 0
                      • CCS86undefined
                        CCS86
                        last edited by

                        @dc42

                        All re-wired with short jumpers... same issue.

                        390a8b54-0ad1-4f41-b8b9-272f3e06a684-image.png

                        bb5e2919-9a4e-4e1c-a654-55c1d8840c30-image.png

                        dc42undefined 1 Reply Last reply Reply Quote 0
                        • dc42undefined
                          dc42 administrators @CCS86
                          last edited by

                          @ccs86 please connect all the jumpers to the appropriate pins on top of the temperature 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
                          • CCS86undefined
                            CCS86 @dc42
                            last edited by

                            @dc42 said in Accelerometer Usage:

                            @ccs86 please connect all the jumpers to the appropriate pins on top of the temperature daughter board.

                            I would need that pinout, since it does not match the mainboard pinout.

                            dc42undefined 1 Reply Last reply Reply Quote 0
                            • dc42undefined
                              dc42 administrators @CCS86
                              last edited by

                              @ccs86 the pilot is the same as on the main board except for TWCK and TWD.

                              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
                              • CCS86undefined
                                CCS86 @dc42
                                last edited by

                                @dc42 said in Accelerometer Usage:

                                @ccs86 the pilot is the same as on the main board except for TWCK and TWD.

                                @dc42 Do I have this right? The error persists.

                                96006ce7-966e-4a0a-a368-466bd7f9f1aa-image.png

                                725b57ac-c64e-4509-b5de-41efebfcc385-image.png

                                8ee28d37-5143-4019-aa9a-3bfb6dab1ebe-image.png

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

                                  @ccs86 I'll try that configuration here.

                                  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 @CCS86
                                    last edited by dc42

                                    @ccs86 this arrangement is working for me, using the following command:

                                    m955 p0 c"twck0+twd0"

                                    I tried without enabling the PT100 channels, and also after enabling both channels. I normally connect the 3.3V wire to the 3.3V pin on the accelerometer, but I tried connecting it to the accelerometer VIN pin to match your setup, and it still works.

                                    2021-07-31 20.12.08.jpg

                                    2021-07-31 20.12.34.jpg

                                    2021-07-31 20.12.57.jpg

                                    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
                                    • CCS86undefined
                                      CCS86 @dc42
                                      last edited by

                                      @dc42 Thank you.

                                      I'm having trouble making out some of your wire colors. Is this correct?

                                      b7f796ca-d331-43bf-b89e-6c8201b650ad-image.png

                                      dc42undefined 1 Reply Last reply Reply Quote 0
                                      • dc42undefined
                                        dc42 administrators @CCS86
                                        last edited by

                                        @ccs86 yes, the wiring is as you have indicated.

                                        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
                                        • CCS86undefined
                                          CCS86 @dc42
                                          last edited by CCS86

                                          @dc42 said in Accelerometer Usage:

                                          @ccs86 yes, the wiring is as you have indicated.

                                          Thanks for sticking with me, I finally got it working! Not sure if it had more to do with connecting to both the main board and the daughterboard, or if I had made an error somewhere.

                                          82ea3f7c-7a8e-40b5-8317-5fcc9dde411a-image.png

                                          I am running into quite a few overflow errors now, but don't see the rhyme or reason. Reducing the collection call to one axis and 500 samples still reported overflows. But after adding the S parameter to the M955 command, I got it to log all 3 axis for 1000 samples without an issue. That M955 S parameter behaves differently than I expected:

                                          ca493605-cedd-4acc-b0a1-4fd55f2aedbe-image.png

                                          Sometimes I get overflow errors at 400 Hz, but not at 1344 Hz

                                          ajdtreydundefined 1 Reply Last reply Reply Quote 0
                                          • CCS86undefined
                                            CCS86
                                            last edited by

                                            Also, is there anything I can do to reduce apparent noise in the accelerometer signal? These peaks seem like anomolies. This is with the printer at rest and steppers disabled. The peaks look very periodic.

                                            07853afd-fc4a-4df7-8f47-bb229117de28-image.png

                                            T3P3Tonyundefined 1 Reply Last reply Reply Quote 0
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