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  1. rexster314

    Joined:
    Dec 2, 2014
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    Ok, so have had my P4 for little over 3 weeks now. From the start I always had a slight tilt of the camera to the right. Using the Gimbal Roll setting, I clicked up about a plus 3 to get the horizon straight. After a week of use I used my reliable setup I made for my P2V+ bird. It's a piece of 5/16 lexan with 4 threaded bolts to allow for adjustments. I used the bubble ;eve; app on my phone to ensure the plate was level. Did the IMU calibration, then the gimbal calibration. I had reset the gimbal roll back to 0 before doing so. Took it up aftewards and still had the tilted horizon. I did that a couple more times but each time I would have the tilted horizon and have to correct the roll in the settings.
    Today I double checked the level of the plate with a real bubble level Come to find out the plate wasn't level. Never was. Recalibrated both the IMU and gimbal. Lo and behold, after taking it up to 100' and horizon was right on the spot. Did several pans of the quad and it was dead level steady.
    Whoop!
     
  2. pomonabill220

    Joined:
    Nov 13, 2015
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    I found that the app wasn't very accurate even when calibrated, compared to a real level, like you found.
    For your plate, you really only need three adjustments. two on two adjacent corners and one in the center on the opposite end.
     
  3. rexster314

    Joined:
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    I was gonna do that but the stuff is so brittle I'm afraid of cracking it. I went through 2 other pieces before doing this one
     
  4. pomonabill220

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    Yes, 5/16 is rather thin! If you can get 3/8 or 1/2 thick, that would be better, but if what you have works for you, good enough!