Need help finding the issue for a sudden flip

Dear members,

I would need some help finding the issue for a sudden flip (fortunately at only 2 meters high) of my quadrocopter running apm 3.2.1. It was a flip on the pitch axis, when I was just hovering and testing a new external compass module I installed because my old 2in1 gps module died.

The loganalyzer says something about vibrations:

-----------------

Log File C:/Users/Sergeant/AppData/Local/Temp/tmp4BC3.tmp.log
Size (kb) 1500.6318359375
No of lines 20910
Duration 0:01:31
Vehicletype ArduCopter
Firmware Version V3.2.1
Firmware Hash 36b405fb
Hardware Type
Free Mem 0
Skipped Lines 0

Test: Autotune = NA -
Test: Balance/Twist = NA -
Test: Brownout = GOOD -
Test: Compass = FAIL - Large change in mag_field (44.38%)
Max mag field length (583.77) > recommended (550.00)

Test: Dupe Log Data = GOOD -
Test: Empty = GOOD -
Test: Event/Failsafe = FAIL - ERR found: CRASH
Test: GPS = GOOD -
Test: IMU Mismatch = WARN - Check vibration or accelerometer calibration. (Mismatch: 1.41, WARN: 0.75, FAIL: 1.50)
Test: Parameters = GOOD -
Test: PM = NA -
Test: Pitch/Roll = NA -
Test: Thrust = NA -
Test: VCC = GOOD -

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I mounted the AUAV-X2 (diy case) on foam and double-sided tape (see picture). I also included the logfile. The copter was flying fine till this day - I did not change any settings or hardware, also the motors seem to be ok. That the internal compass is not working could have nothing to do with this, right?

I would appreciate any suggestions.... 

29.BIN

auav_case.jpg

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Replies

  • Actually it is complaining about horrible MAG interference. You are getting really bad noise to your IMU.

    • So the warning does not mean to many vibrations? Can a mag interference cause a flip in stabilize mode?

      Maybe I should disable the internal compass.... this is possible, is it?

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