Position Hold Tuning MK v2.0

Discussion in 'Electronics' started by Chris Fox, Sep 9, 2013.

  1. Chris Fox

    Chris Fox Active Member

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    G'Day All,

    I'm after a little bit of advice, I have read through the MK documentation, and have been trying to tune the PH, and I'm not getting the results I am expecting.

    My only reference is the PH on the dji phantom I have been learning on, and at the moment, I can't get similar performance on the CS8.

    On the MK wiki it suggests varying the gain between values of 60 and 100, the best performance I have achieved was by reducing the gain to 65, but thought I was on the wrong path, to continue lowering it, is it safe to continue lowering the gain to try and archive the PH performance?

    I originally had the compass value at 64, which caused some pretty erratic toilet bowling, however when I reduced it to zero, the copter would rotate (yaw left or into the wind). Can I set a value in between zero and 64?

    I have also experimented with the GPS PID values, I increased the P to 95, which would bring the copters back a bit faster, however I was only trying to vary the damping to slow down the overshoot effect, should I also have looked at the I value?

    Is there a process, or sequence in tuning individual values to achieve a satisfactory PH performance

    Any pointers would be greatly appreciated.

    Thanks

    Chris
     
  2. Chris Fox

    Chris Fox Active Member

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    Well, I'm going back to basics, as the threads in the CS6 area about the PH performance make me believe that I what I have been doing should be reasonable in getting some reliable PH performance. So I have just re-calibrated the accelerometers (throttle up and to the right) after levelling the airframe using an inclinometer. Maybe this will help.
     
  3. Dave King

    Dave King Well-Known Member

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    Chris

    Like yourself I found the PH performance to be subpar compared to the 0.90J or backwards versions. I too experiemented till I was blue in the face and did not find anything I liked so I went back to 0.90J. The only thing I really like about 2.0 is the double stick safety feature. I was really wanting to add it. I know that Steve Maller posted that he reduced his compass affect to 0 and it significantly helped him. I see no reason why you can't try something in the middle and seeing if it works.
     
  4. Chris Fox

    Chris Fox Active Member

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    Thanks Dave,

    I gave it one more shot on the new firmware, and have reverted to the 90j, as soon as I reverted the problem vanished, and I had nice stable position hold, even though it was blowing 20+ knots.
     
  5. Dave King

    Dave King Well-Known Member

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    I posted these reported problems on the mikrokopter forum. Stay tuned.
     

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