LibrePilot Forum
Development => Hardware => Topic started by: anthropo on January 28, 2019, 07:10:38 pm
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Hello,
it's a day i'm trying to set my external compass orientation. I want the 3 bars stay at zero in the mag settings. it is never the case.
when i set 0,0,0 all is ok till i return the quad. Then z goes to 43.
I tried the 64 combinaisons (brute force) as i can't solve the problem by looking at the gps.
Can you help me ? here is a picture of the bottom of the gps. The mag is written 5883 then it is the HMC58836L
I'm serious, I'm sick of it.
Thank you
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i just opened a dji gps i had. The mag is in the same position. So why do i get this gap on z axis returning the quad ?
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GPS has an arrow on it. That arrow must point forward. You probably already did that. Also, if you are using I2C aux mag (separate cable, usually 2 wire that goes to FlexiPort) then you must set Aux Mag Orientation (in Attitude->Magnetometer) to either 0,180,0 or 180,0,180 (they are the same rotation). This will get it close. It is OK if it is a few units off. Rotating fast will make it show farther off than it is. Rotate slowly and stop to check at a few rotations.
If you are using an OP GPSv9 or a DJI GPS, leave the Aux Mag Orientation at 0,0,0
This article has everything about setup, test, debug of aux mag.
https://librepilot.atlassian.net/wiki/spaces/LPDOC/pages/18382863/Aux+Mag+Setup+and+Calibration
Also be aware that the Flight Controller must be oriented correctly too. The arrow must point forward, or if not, Attitude -> Settings -> RotateVirtual.. must be set correctly. First get it flying without the GPS/mag to prove that the FC orientation, etc. is configured correctly.