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    Accelerometer Usage

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    • 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
      • T3P3Tonyundefined
        T3P3Tony administrators @CCS86
        last edited by

        @ccs86 could those peaks be from your fan?

        www.duet3d.com

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        • ajdtreydundefined
          ajdtreyd @CCS86
          last edited by

          @ccs86

          About the overflows - I was getting these at first. Turned out the write speed of my SD card was abysmal (0.8MB/s). I got a new SD card and all is good now.

          Try running an SD read/write test ( M122 P104 S[file size in MB] ) and get a new card if write speeds are under 1.5MB/s

          CCS86undefined 1 Reply Last reply Reply Quote 2
          • CCS86undefined
            CCS86 @ajdtreyd
            last edited by

            @ajdtreyd said in Accelerometer Usage:

            @ccs86

            About the overflows - I was getting these at first. Turned out the write speed of my SD card was abysmal (0.8MB/s). I got a new SD card and all is good now.

            Try running an SD read/write test ( M122 P104 S[file size in MB] ) and get a new card if write speeds are under 1.5MB/s

            Good call!

            Not terrible, not amazing:

            SD write speed for 5.0Mbyte file was 1.95Mbytes/sec
            

            I'll probably pop a new one in for good measure,

            ajdtreydundefined 1 Reply Last reply Reply Quote 0
            • CCS86undefined
              CCS86 @T3P3Tony
              last edited by CCS86

              @t3p3tony said in Accelerometer Usage:

              @ccs86 could those peaks be from your fan?

              All fans were off during this test.

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

              There are a few places (like #320) where the value appears normal.

              1330 Hz / 20 = 66.5 Hz. I'm not sure if that frequency coincides with anything computational on the main board.

              o_lampeundefined dc42undefined 2 Replies Last reply Reply Quote 0
              • o_lampeundefined
                o_lampe @CCS86
                last edited by

                @ccs86
                All the time reading about the accel sensorboard, I was worried about feeding the Vin pin with 3.3V.
                The sensorboard sure uses an LowDrop voltage regulator, but does it work reliable with such low voltage?
                @dc42 uses the 3V (out) pin to feed 3.3V backwards into the board, which makes more sense to me.

                Maybe worth trying to either feed 5V through Vin or in Davids way and repeat the test.

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

                  @o_lampe said in Accelerometer Usage:

                  @ccs86
                  All the time reading about the accel sensorboard, I was worried about feeding the Vin pin with 3.3V.
                  The sensorboard sure uses an LowDrop voltage regulator, but does it work reliable with such low voltage?
                  @dc42 uses the 3V (out) pin to feed 3.3V backwards into the board, which makes more sense to me.

                  Maybe worth trying to either feed 5V through Vin or in Davids way and repeat the test.

                  They claim that this board will take a 3V-5V input. But, it's easy enough to test, so...

                  1 Reply Last reply Reply Quote 0
                  • 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
                          
                          dc42undefined 1 Reply Last reply Reply Quote 0
                          • 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. 😁

                            1 Reply Last reply Reply Quote 1
                            • 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 !

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                                          • 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
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