Lotier Problems

Hi All,

i have been struggling with a loiter issue for and i wanted to try and get some feedback.

Im running APM 2.5 with external compass mod. (compassmot ~5%)

NEO-6 rev2 GPS

F450 frame, 900kv motors 9-10" props depending on payload.

I have had the unit since march with little problems.  I also have had a few crashes from flying a bit to aggressive sometimes.

Basically the quad flies very well in stab and alt hold, but sometimes when i flick it to loiter it shoots off in a random direction.  You can see this is the attached logs around 12642 and 13810.  Its easy to see if you graph pitch in and pitch and see a big difference between them.  And it takes off pretty quick sometimes. (faster then it should go in nav).  i can save it by switching back to stab or alt hold.

If it is loitering ok, i will fly it around in loiter and after a bit it likes to wander off, but not as fast as above.  i have control input but sometimes it wanders faster then the speed it will let me correct.  again if i switch to stab or alt hold it it fine.

I have tried to look at the logs, but the only thing that stands out to me is right after i switch to loiter, the WPdis shoots up to 2.5m.  when its working properly it floats between 0-1m.

I thought it might be related to # of sats, but doesn't seem to be.  however less sats may make it worse.

My guess right now is a flacky GPS unit.  I have tried mounting it iin diff spots and 3" off the main board to see if that helps, but does not seem to change the behavior.  I will get another gps unit and see if that helps.

I also tried to reload the firmware and restore defaults.  no change.

Thanks in advance2013-08-15%2000-15%20114.log.

2013-08-15 00-15 114.log

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Replies

  • You seemed to have fixed this issue, but I was experiencing this for a bit and found I left my Data logging under Bitmask on and I believe I was overloading the processor. I turned it back to default and cleared my logs and have not had a bit of an issue since. 

  • I had similar experience with my f450. This post solved my problem :http://diydrones.com/forum/topics/apm-2-9-loiter-alt-hold-vibration...

  • Look at your HDOP value. It jumps around quite a bit. So during the period you mention it goes from 1.78 to 3.29. You typically want to see this consistently under 2.0. Could something be interfering with the GPS receiver?

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