Welcome to PhantomPilots.com

Sign up for a weekly email of the latest drone news & information

Also noticed jello on your PV2+?

Discussion in 'Phantom 2 Vision + Discussion' started by lizard, Jun 2, 2014.

  1. lizard

    Joined:
    May 29, 2014
    Messages:
    19
    Likes Received:
    0
    Hi everyone, it appears there is serious software and/or engineering issue with the PV2+ gimbal control loops.
    Under some gimbal axes angles, gimbal control loops becomes unstable and resonates slightly with about 40-60Hz frequency. This instability is delicate - you can feel vibrations and hear slight hum, but it is enough to ruin best moments of your shot by creating intermittent jello. Best way to check it, is to turn on PV2+, connect the phone app and tilt the gimbal to various angles while moving the whole PV2+ in the hand to various angles. At certain positions and angles, PV2+ gimbal got unstable and stabilizes back after moving out the critical angle. It also appears there is control loop auto-tuning implemented in the control, doing auto-tuning on power-on but it just not work (these jerky gimbal movements on PV2+ power on). With other gimbals users can adjust loops gains manually or even turn on notch filters to eliminate mechanical resonances, but not in P2V+.

    Anyone noticed occasional jello in your shots?

    Hey DJI, are you listening?
     
  2. skyhighdiver

    Joined:
    Dec 19, 2013
    Messages:
    1,007
    Likes Received:
    211
    Location:
    South Dakota
    Re: Also noticed sporadic jello on your PV2+? DJI gimbal iss


    +200 :cry:
     
  3. lizard

    Joined:
    May 29, 2014
    Messages:
    19
    Likes Received:
    0
    Re: Also noticed sporadic jello on your PV2+? DJI gimbal iss

    Check this out:
    http://youtu.be/iySFbchfPYY
    Exactly as mine, but in different tilt angle, gimbal on my P2V+ makes noises and jello pointing straight down.
     

    Attached Files:

  4. lizard

    Joined:
    May 29, 2014
    Messages:
    19
    Likes Received:
    0
    Re: Also noticed sporadic jello on your PV2+? DJI gimbal iss

    Another PV2+ jello example posted here: https://www.youtube.com/watch?v=q_8AjRPsXDo
    Jello is delicate, intermittent and only occurs at certain till and bird angles.
    Anyone with the same issue?
     
  5. DiegoF

    Joined:
    Jan 16, 2014
    Messages:
    28
    Likes Received:
    0
  6. ToThePoint

    Joined:
    Jun 4, 2014
    Messages:
    618
    Likes Received:
    1
    Location:
    Antwerp, Belgium
    I did the same as you showed in the video.
    Mine hasn't have it, sorry.

    JP