Hi all,
I'm attaching my log from our last flight as our little quad went completly bonkers before it crashed.
Short after takeoff it went completly out of control, no response at all from RC or Telemetry and then crashed near a pond (thank god).
But the mistery was about to begin when we started reviewing the log and found out that the trigger was the failsafe error Err: EKF_CHECK-2 / Err: FAILSAFE_ EKF-1.
In understand these two were recently added to APM, but this ain't the first time I see this sort of thing happening.
I'm attaching my log in hopes for some guidance.
Thank you all!
Replies
Looking at the logs there appears to be 4 problems that are consistent.
1. The log reports EKF - it should be saying DCM (firmware error)
2. Problems are with vibrations and building error - See vibration analysis in Mission Planner
3. Almost always the trigger is large yaw - could be PID tuning or lack of torque, either way the yaw of the copter is not what the flight controller wants it to be.
4. Old GPS unit without 2nd Mag - upgrade if possible.
OK, here is my log.
got a nice crash on that
2015-04-12 15-26-02.log
There's no IMU data that I can see so difficult to tell what's going on. No MAG data either.
But your ErrYaw is very bad and that's why you get the error and why it hits the failsafe. The ErrYaw is calulated by examining the difference between the compass heading and the inertial heading. Bad compass puts the first out, bad vibrations the second. So check both.
And another one...
2015-04-03 15-57-24.log
Note that the error is actually from the DCM system even though it says EKF (it's a bug in the code that it says EKF) - this had me confused for a long time, until Randy pointed it out. So ignore everything the docs say about EKF - if you don't have it enabled this doesn't apply. That still doesn't fix the issue however :)
Well that makes sense then. Clearly I had a compass issue but the EKF failsafe concerned me since we are not using EKF. Thanks for the help
Update On mine. I took the board out of the case.. cleaned it with alcohole and a tooth brush.. examined it under a microscope and found NOTHING! looked good..
I put it back in my quad calibrated everything and took it back out. IT WORKED.. no EKF.. anywhere in any log..
Sorry I dodn't remember where, but in MP I found a EKF drop down that had nothing in it.. I set it to disable. not sure if that's whats fixed it or not. maybe just one time luck..
APM 2.6 clone
Guys - I think I may have found the problem/bug - can you post a log each from the flight (please not the Tlog) the bin would be much better for what I'm looking at.
This is a 3DR Iris with a GoPro on a Gimbal with a DroneDeploy LTE Telemetry Modem...
EKF Failsafe Error => Land
Looking for some insight and crash analysis.
2015-08-18 12-07-48 5.bin
2015-08-18 12-07-48 5.bin.log
Here is mine from the Pixhawk. You can see the error at line 30305
15-04-30_16-28-02.bin
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