AC-3.1 autotune support discussion

Josh Welsh December 1, 2014 at 7:54am

You can. Have the Roll I value be the same value as the Roll P value. 17.5 is a bit high for Stab P IMO, I'd probably start that out with 10 or so, but that's just me.

Reuben November 12, 2014 at 12:10am

Sorry wrong place to post what i was going to ask just ignore ..

Brian Leroux November 11, 2014 at 6:35pm

APM newb here. So I can't seem to get autotune to complete. It fails part way through the roll phase. I am not certain how to interpret the logs to see what the problem is. I am hoping someone can point me in the right direction.

One thing I do seem to have an issue with is altitude hold. It seems to nold hold very well and I wonder if this is causing the problem. I am not sure why altitude hold isn't very good either. I am working on minimizing vibrations now as I am usinf new sunnysky motors and have the flight controller now mounted with gel tape.

Anyway, here is the logs from my flight today. Maybe someone can see where my problems lie.

2014-11-11 15-11-10.log

Developer

leonardthall > Brian Leroux November 11, 2014 at 9:48pm

Hi Brian,

Can you tell me a little more about your copter. Your tune looks a little strange and I agree that your alt hold looks pretty average. It also looks like you are gradually increasing in altitude, I doubt this is messing things up but it is something to look at.

If you have done some other autotunes I would be interested to see them and see if they have the same issues.
- Brian Leroux > leonardthall November 12, 2014 at 7:13am
  
  I found a couple more autotunes from my first attempt. This was when the fc was mounted on a full sheet of foam. The first log I provided I had switch to using the kyosho anti vibe gel.
  
  2014-10-25 08-45-55.log
  
  2014-10-25 08-51-06.log
  
  https://storage.ning.com/topology/rest/1.0/file/get/3702675113?profile=original
  - Brian Leroux > Brian Leroux November 12, 2014 at 10:47am
    
    I just performed a vibration test. That does not appear to be my issue. I did the test in alt hold, landed, and then did it in stabilize holding the altitude as manually with the throttle.
  - Developer
    
    Randy > Brian Leroux November 12, 2014 at 9:53am
    
    By the way, 3DR has started selling the foam they include with the Pixhawk kits. I think they spent a fair bit of time evaluating different foams and gels.
- Brian Leroux > leonardthall November 12, 2014 at 3:51am
  
  Here are the copter details.
  HJ450 spider frame
  Apm 2.6 clone
  Sunnysky 980kv motors
  Apc 10" multirotor props
  Multistar esc
  It also has the basic telemetry radio and apm power module.
  image.jpg
  - Developer
    
    leonardthall > Brian Leroux November 12, 2014 at 4:07am
    
    Hi Brian,
    
    Your GPS is upside down but other than that it looks ok.
    
    How have you calculated your CG. The reason I ask is I can see a little coupling between roll and pitch.
    - Brian Leroux > leonardthall November 12, 2014 at 4:27am
      
      Ok i will flip the gps over. I couldn't find any documentation on gps orientation.
      
      As fir cg, the frame had the cg marked. So i centered the fc on that and distributed the weight to balsnce around the marked cg.

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AC-3.1 autotune support discussion

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