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    Anybody wants a stepper motor analyzer?

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    • zaptaundefined
      zapta @nyaru
      last edited by

      @nyaru, I calibrated the sensors with DC current from a power supply, using the current reading on the NRF52 microcontroller. With the TI TMCS1108A4BQDT I am getting 400mv/A, with the CC6920BSO 5A I am getting only 280 mv/A, presumeably because of the loading by the MCU's analog input.

      You may want to do the same with the RPI PIco, I don't know how its' compares to the NRF52.

      JoergS5undefined 1 Reply Last reply Reply Quote 1
      • JoergS5undefined
        JoergS5 @zapta
        last edited by

        @zapta said in Anybody wants a stepper motor analyzer?:

        CC6920BSO

        according to datasheet https://datasheet.lcsc.com/lcsc/2108201830_Cross-chip-CC6920BSO-20A_C2880432.pdf page 4 it is about 270 mV/A.

        zaptaundefined 1 Reply Last reply Reply Quote 0
        • zaptaundefined
          zapta @JoergS5
          last edited by

          @joergs5 , yes you are right. That's good news because it's not impedance sensitive as I thought. Also makes sense since +/-5A at 400mv/a will require 4V span on a 3.3v IC.

          The PCB has room for optional config resistors R4, R5. Can be used to select the range base on the IC installed.

          https://github.com/zapta/simple_stepper_motor_analyzer/blob/main/kicad/stepper_analyzer.pdf

          https://github.com/zapta/simple_stepper_motor_analyzer/blob/main/platformio/src/misc/hardware_config.cpp#L53

          ctilley79undefined zaptaundefined 2 Replies Last reply Reply Quote 1
          • ctilley79undefined
            ctilley79 @zapta
            last edited by

            @zapta I'm dying to get one of these. Are you still producing batches? EU only or US as well?

            zaptaundefined 1 Reply Last reply Reply Quote 0
            • zaptaundefined
              zapta @ctilley79
              last edited by

              @ctilley79, I don' t produce them any more but other here do.

              I am working now on a different version that uses a computer to show the data using a bluetooth link. So far it's promising. Here is a video with a screen shot.

              https://github.com/zapta/ble_stepper_monitor/blob/main/docs/screen_capture_video.mp4?raw=true

              1 Reply Last reply Reply Quote 1
              • zaptaundefined
                zapta @zapta
                last edited by zapta

                Here is an interesting observation that I recorded today on the A stepper while my V2.4 was printing.

                While resting, the stepper current is reduced from 1.4A to 1A. This is before the standby stepper current that is even lower, and it protects the driver when the peak coil current may become also the RMS current. IIRC there is a default setting for it.

                (Open for full resolution)
                89677c7f-3dc1-4cb0-ad37-10c0a2fa98d6-image.png

                1 Reply Last reply Reply Quote 0
                • Th0mpyundefined
                  Th0mpy
                  last edited by

                  Sorry to revive an older thread. I finally got my stuff together and posted what I have left of the OG stepper motor analyzers on Etsy. If you're still interested in the original version have a look: https://www.etsy.com/tArrayEngineering/listing/1359496786/stepper-motor-analyzer

                  Usually the team that scores the most points wins the game.

                  1 Reply Last reply Reply Quote 0
                  • mesacrashundefined
                    mesacrash
                    last edited by

                    I would like one of these.

                    Th0mpyundefined 1 Reply Last reply Reply Quote 0
                    • Th0mpyundefined
                      Th0mpy @mesacrash
                      last edited by

                      @mesacrash I have the original version in my etsy shop (linked above). You can order them right from there.

                      Usually the team that scores the most points wins the game.

                      1 Reply Last reply Reply Quote 0
                      • jay_s_ukundefined jay_s_uk referenced this topic
                      • rjenkinsgbundefined
                        rjenkinsgb
                        last edited by

                        Hi all,

                        I've assembled another unit from the original parts I got, but I am having serious problems trying to build the program for it..

                        I've changed machines since I did the original so its a fresh install of VS Code & platformio etc.

                        I cannot get the Wizio stuff to work; it looks like some part of that project has been either removed or renamed?

                        I never normally use Visual Studio & the only experience I've had with platformio was in one day, for the last one of these I built.

                        Any clues or fixes to get it to build properly would be greatly appreciated!

                        Working on Win 10 64, with all updates etc.

                        (I normally program such as PICs using MPLab & CCS compiler, or industrial controls - never visual studio stuff).

                        Robert J.

                        Printers: Overlord pro, Kossel XL+ with Duet 6HC and "Frankentron", TronXY X5SA Pro converted to E3D toolchange with Duet 6HC and 1LC toolboards.

                        zaptaundefined 1 Reply Last reply Reply Quote 0
                        • zaptaundefined
                          zapta @rjenkinsgb
                          last edited by

                          @rjenkinsgb, IIRC, @Th0mpy mentioned that he encountered a change in Wizio's repository (some stuff was moved or deleted) and he fixed it somehow. Hopefully he will chime in here. If it will not resolve, please let me know.

                          rjenkinsgbundefined 1 Reply Last reply Reply Quote 0
                          • rjenkinsgbundefined
                            rjenkinsgb @zapta
                            last edited by

                            @zapta
                            Hi,
                            OK, thanks for that, hopefully Th0mpy is around!

                            I can't find anything relevant in his posts in this topic, unfortunately.

                            Robert J.

                            Printers: Overlord pro, Kossel XL+ with Duet 6HC and "Frankentron", TronXY X5SA Pro converted to E3D toolchange with Duet 6HC and 1LC toolboards.

                            Th0mpyundefined 2 Replies Last reply Reply Quote 0
                            • Th0mpyundefined
                              Th0mpy @rjenkinsgb
                              last edited by

                              @rjenkinsgb Yeah I'm around 🙂

                              I will need to double check but I do have a repo which does work. Give me the morning to look it over and I'll link it here.

                              Usually the team that scores the most points wins the game.

                              rjenkinsgbundefined 1 Reply Last reply Reply Quote 0
                              • rjenkinsgbundefined
                                rjenkinsgb @Th0mpy
                                last edited by

                                @Th0mpy
                                Excellent, thank you

                                Robert J.

                                Printers: Overlord pro, Kossel XL+ with Duet 6HC and "Frankentron", TronXY X5SA Pro converted to E3D toolchange with Duet 6HC and 1LC toolboards.

                                1 Reply Last reply Reply Quote 0
                                • Th0mpyundefined
                                  Th0mpy @rjenkinsgb
                                  last edited by

                                  @rjenkinsgb

                                  You can update your code to point to these two repositories:
                                  https://github.com/th0mpy/wizio-pico
                                  and
                                  https://github.com/th0mpy/framework-wizio-pico

                                  As I recall, that's all I had to do. Let me know if that works and I can double check my DEV VM when I get home later.

                                  Usually the team that scores the most points wins the game.

                                  rjenkinsgbundefined 1 Reply Last reply Reply Quote 1
                                  • rjenkinsgbundefined
                                    rjenkinsgb @Th0mpy
                                    last edited by

                                    @Th0mpy said in Anybody wants a stepper motor analyzer?:

                                    You can update your code to point to these two repositories:

                                    That's got it working, thank you!

                                    Robert J.

                                    Printers: Overlord pro, Kossel XL+ with Duet 6HC and "Frankentron", TronXY X5SA Pro converted to E3D toolchange with Duet 6HC and 1LC toolboards.

                                    1 Reply Last reply Reply Quote 0
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