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    Accelerometer Usage

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    • dc42undefined
      dc42 administrators @CCS86
      last edited by dc42

      @ccs86 said in Accelerometer Usage:

      Interestingly, every single one of these peaks falls on an even 20 sample interval (#20, #40, #60, #80, #100, #120, etc).

      I suspect it may be an undetected data overrun then. RRF tries to read 20 values at a time. The FIFO in the accelerometer is 32 values long, so this allows some leeway. Try capturing all three axes and see if it is the same on all of them.

      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 said in Accelerometer Usage:

        Interestingly, every single one of these peaks falls on an even 20 sample interval (#20, #40, #60, #80, #100, #120, etc).

        I suspect it may be an undetected data overrun then. RRF tries to read 20 values at a time. The FIFO in the accelerometer is 32 values long, so this allows some leeway. Try capturing all three axes and see if it is the same on all of them.

        I can confirm that X and Y also have these 20-sample peaks.

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

          @ccs86 what M955 and M956 parameters are you using? I will try the same parameters.

          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 what M955 and M956 parameters are you using? I will try the same parameters.

            M955 P0 C"twck0+twd0"
            
            G1 X25 G4 S2 G1 X125 F20000 M400 M956 X P0 S1000 A0
            
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            • ajdtreydundefined
              ajdtreyd @CCS86
              last edited by

              @ccs86

              If you need to buy one, I can recommend the PNY EliteX U3 V30 64GB. It's getting 3.8-4Mb/s write speed in my Duet 2 Wifi. 😁

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              • dc42undefined
                dc42 administrators @CCS86
                last edited by

                @ccs86 I've run the accelerometer on my Maestro and the result is fairly clean:

                b5009f59-1844-47f0-83b9-d0b75a5ddc9f-image.png

                However, there are some small glitches on the Z reading and it looks like they may be at multiples of 20 samples. I'll try reading one less sample from the FIFO.

                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

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

                  Reading one less sample doesn't help. I can only assume that communicating with the accelerometer creates an electrical disturbance that slightly affects the reading.

                  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:

                    Reading one less sample doesn't help. I can only assume that communicating with the accelerometer creates an electrical disturbance that slightly affects the reading.

                    If you read only 10 samples at a time, do the peaks appear at that new interval?

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

                      @ccs86 said in Accelerometer Usage:

                      @dc42 said in Accelerometer Usage:

                      Reading one less sample doesn't help. I can only assume that communicating with the accelerometer creates an electrical disturbance that slightly affects the reading.

                      If you read only 10 samples at a time, do the peaks appear at that new interval?

                      I didn't try that. I did find that the LIS3DSH has smaller peaks are multiples of 20 samples than the LIS3DH.

                      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

                      tecnoundefined CCS86undefined 2 Replies Last reply Reply Quote 0
                      • tecnoundefined
                        tecno @dc42
                        last edited by

                        @dc42

                        Is this one up to the task?

                        5b67abea-a9c0-4ce2-958e-37f0360a179e-image.png

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

                          @tecno yes, that's the LIS3DSH board that I tested with.

                          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

                          tecnoundefined 2 Replies Last reply Reply Quote 0
                          • tecnoundefined
                            tecno @dc42
                            last edited by

                            @dc42

                            Thanks !

                            1 Reply Last reply Reply Quote 0
                            • Sotidiiundefined
                              Sotidii
                              last edited by Sotidii

                              G1 X-20 G4 S2 M956 P121.0 S1000 A0 G4 P10 G1 X50 F20000
                              

                              Error: M956: Accelerometer is already collecting data

                              gives an error message

                              Duet 3 3.4.0-b2
                              DSF
                              Tool Board 1.1

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

                                @sotidii please send M115 B# where # is the CAN address of the tool board, to verify the tool board firmware version. There was a bug with similar symptoms in unofficial beta builds of the tool board, but it was fixed in the official beta release.

                                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

                                Sotidiiundefined 1 Reply Last reply Reply Quote 0
                                • Sotidiiundefined
                                  Sotidii @dc42
                                  last edited by

                                  @dc42
                                  M115 B 121
                                  FIRMWARE_NAME: RepRapFirmware for Duet 3 MB6HC FIRMWARE_VERSION: 3.4.0beta2 ELECTRONICS: Duet 3 MB6HC v0.6 or 1.0 FIRMWARE_DATE: 2021-08-03 12:42:44

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                                  • dc42undefined
                                    dc42 administrators @Sotidii
                                    last edited by

                                    @sotidii said in Accelerometer Usage:

                                    @dc42
                                    M115 B 121
                                    FIRMWARE_NAME: RepRapFirmware for Duet 3 MB6HC FIRMWARE_VERSION: 3.4.0beta2 ELECTRONICS: Duet 3 MB6HC v0.6 or 1.0 FIRMWARE_DATE: 2021-08-03 12:42:44

                                    Run the command again, but don't put a space between the B and the 121.

                                    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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                                    • Sotidiiundefined
                                      Sotidii @dc42
                                      last edited by

                                      @dc42
                                      M115 B121
                                      Duet TOOL1LC firmware version 3.3RC3 (2021-05-26 12:30:20)

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                                      • dc42undefined
                                        dc42 administrators @Sotidii
                                        last edited by

                                        @sotidii said in Accelerometer Usage:

                                        Duet TOOL1LC firmware version 3.3RC3 (2021-05-26 12:30:20)

                                        Please upgrade the tool board firmware to version 3.4beta2.

                                        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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                                        • Sotidiiundefined
                                          Sotidii
                                          last edited by

                                          @dc42 OK!

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                                          • CCS86undefined
                                            CCS86 @dc42
                                            last edited by CCS86

                                            @dc42 said in Accelerometer Usage:

                                            @ccs86 said in Accelerometer Usage:

                                            @dc42 said in Accelerometer Usage:

                                            Reading one less sample doesn't help. I can only assume that communicating with the accelerometer creates an electrical disturbance that slightly affects the reading.

                                            If you read only 10 samples at a time, do the peaks appear at that new interval?

                                            I didn't try that. I did find that the LIS3DSH has smaller peaks are multiples of 20 samples than the LIS3DH.

                                            Is eliminating these false peaks something you plan on pursuing? It seems like they have the ability to skew the analysis.

                                            I tried manually removing the peak samples from a copy of one of my logs, for the purpose of comparing the analyzed result. But while the modified log is displayed correctly in DWC, the analysis always shows a blank chart.

                                            dc42undefined 1 Reply Last reply Reply Quote 0
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