Problems with magnetometer since using INAV

[elektrofreakz]

Board and Version

Omnibus F4 V3 from ebay seller
Inav 1.9.3

INAV/OMNIBUSF4V3 1.9.1 Apr 21 2018 / 13:13:58 (03a5c19)

Behavior

When using the heading hold mode on inav the quad starts spinning around. I never had this problem with this magnetometer in cleanflight, it has started since using INAV
GPS hold and altitude hold work fine. I use them together to get my drone as stable as possible for photography. When i undo the heading hold function it stops spinning.

I checked my magnetometer function by looking in the sensors tab from INAV and spinning the motors. It does not cause any interference. Magnetometer is a build in from an Ublox M8N module. And is mounted +- 10Cm above quad. Frame is a 3D printed MHQ2.

Also did multiple calibrations but did not help. Only going back to cleanflight solves this?

Blackbox logs/Config (.ZIP) where problem occurs

pastebin CLI dump:
https://pastebin.com/hukweiaD

[rb1205]

Probably related to #3288, however I've got mag issues with 1.9+ as well on my sp3 evo integrated sensor, so much that I downgraded to 1.8. You might want to downgrade to 1.8 as well until #3413 is released.

[elektrofreakz]

According to my compass chip in the M8N it's a L8832122 AKA HMC5883L. So cant imagine thats the problem, but i will try downgrading to 1.8 and test my setup!

[elektrofreakz]

still turning around with INAV1.8. But now can't calibrate the compass with the calibrate button. INAV recognizes the compass as a HMC5883. I tried manually setting the correct value's (from previous dump) via CLI commands. After doing this the red cross behind the compass line in the setup tab went away,. But it is still turning around. It's more steady with GPS and compass off. The calibrate problem is the same with the accelerometer. Had to set the variables in CLI manually

[rb1205]

The GUI calibrate buttons are a recent addition, might not work on 1.8. Use the stick command to trigger it.

[elektrofreakz]

Did the stick command and saved settings, will try flying the craft tomorrow. Also noticed now that when i tilt the craft forward, the model in the setup screen turns around. When i check the INAV docs it says that i should recalibrate my compass?

If heading value is correct when copter is level but drifts when you tilt the model, then your should re-calibrate the compass.

Did this multiple times, but keeps drifting when tilted. Can this be the strange turning around that i am experiencing? I ordered a new compass just in case. I have the compass now at CW 180 degrees configured.

[shellixyz]

@elektrofreakz It probably means your magnetometer alignment setting is not correct (the magnetometer is upside down in the GPS module).

[fiam]

@elektrofreakz Don't fly until you have that sorted out. Enabling any navigation modes with an improperly setup compass it's going to end up badly.

[elektrofreakz]

Yeah, i know lol. Had to rebuild the whole craft because i tried to fly with not enough GPS satellites and returning home mode.

Got it now on CW 180 FLIP. It looks like this should be the right setting. The heading is also reading almost 0 degrees when the craft nose is pointing north. It doesnt react as extreme as before. But still when i tilt the craft forward it turns around 20 degrees to the right. When i tilt it backwards its does the same but to the left

[elektrofreakz]

Had a small testflight, and it seems to be stable. Had no issues with turning around in flight.
https://www.youtube.com/watch?v=OiM7a3SCJSw&feature=youtu.be

[teckel12]

@elektrofreakz You stated "But still when i tilt the craft forward it turns around 20 degrees to the right. When i tilt it backwards its does the same but to the left". This is a classic indication that you don't have the correct orientation for your compass. It may fly, but in other situations it could be catastrophic. I can all but guarantee that your compass orientation is incorrect.

[elektrofreakz]

Yes, i tried all different MAG positions, and recalibrate the MAG sensor. But with CW 0 flip it's the most stable. Cant say its completely stable but it's better then nothing. Only issue is that with the cw 0 flip the heading is 180 deg off. So north is not facing north.. When i set it on cw 180 flip, the heading is correct but it starts spinning around like a mad man when the craft is tilted.

[teckel12]

@elektrofreakz Sounds like a magnatometer alignment problem still, try set align_mag = CW270FLIP and then calibrate outside.

[elektrofreakz]

Fixed! Got an other GPS and magnetometer. Got the SE100 now. With HMC5883
got the magnetometer on CW270 flip.
Tried the old one on those settings but could not get it right. Also, the GPS on the SE100 is better :)

https://youtu.be/S1Hf1dx2XvY

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[stale]

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