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Pitch channel causing problems
  • marcus
    Hi Guys.
    I have heard of similar problems but I can't fix this using methods I see used by others.

    Running the Basecam 3-axis setup on an ASP gimbal - handheld.

    The Roll and Yaw channels work fine but the pitch is freaking out at around 10-12 degrees from center and causing oscillations in the Roll & yaw.

    So far I have done the following trying to fix this..

    - Extensive tuning
    - Switched firmwares from 2.34b to 2.40
    - Swapped sensor from another [good] gimbal

    Made a video of this issue. Please have a look and see if you can see anything obvious. Any help graefully accepted :)



    Thanks
    Marcus
  • marcus
    I also did the 6-point calibration...
  • andludo
    exactly same problem... :(
  • Garug
    First verify that IMU orientation is correctly set on GUI. Then perform motor configuration auto to get inverted status right and after set num.poles according the actual pole counts on the motors.

    You most likely have inverted wrongly set for the motors.
  • marcus
    the trouble with the auto pole process is that it thinks all three motors have different pole counts. Even though they are all the same type of motor ! What the heck ??
  • Garug
    The inverter part works. The pole count is not that accurate. Set the pole count manually as per the real pole count for your motors, count the magnets if not known.
  • marcus
    I played with the inversion selections without success :(
  • Garug
    To me it looks on the video that the Gimbal is working ok, it is just not set up or tuned right. There is one axis that is not verified on video that it is balanced well, the Yaw. It needs to be well balanced too.

    It could be just the PID and/or Power settings, but I think there is something else too. Did you verify the IMU directions before Auto motor configuration?

    And as I always suggest, first get it working with one point calibration. I newer have needed anything else than one point calibration.

    Ps. If you want to make better gimbal shorten the arms as much as possible. (of-course remaining balance)
  • marcus
    Tried all the possible inversion combinations and the gimbal is as small as balancing will allow. just gonna scrap the thing, it's not worth the effort at this point. I got hours in to it with nothing back. Junk.
  • marcus
    I don't get what you mean about the Yaw not being balanced either, it works exactly like I want it to.............. ?
  • Garug
    I am not saying the Yaw is not balanced, just that the video does not show testing that it is balanced as shown for other axis.

    Yaw can work out of balance, but affect stability of other axis, so it need to be physically balanced.
  • marcus
    How does one balance the yaw ? lay the gimbal back at 90deg and attempt mechanical balance?
  • Zeb
    When it's powered off tilt the whole gimbal left and right, if the yaw is balanced the camera (lower part of the gimbal) will not move.
    If you tilt/lean to the left and the camera moves (rotates) to the left then you need to adjust the arm below the yaw motor towards you, if you tilt to the left and the camera moves to the right then slide the arm away from you. Do the adjustment about every 45 degrees in yaw for very fine tuning.
    Final result should be that when you lean/tilt in either direction the camera remains pointing directly ahead.
  • marcus
    ok thanks man
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