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Re: [Paparazzi-devel] Magnetometer offset int_cmpl_quat


From: Romney, Jefferson S
Subject: Re: [Paparazzi-devel] Magnetometer offset int_cmpl_quat
Date: Tue, 5 Jun 2012 11:23:50 +0000

Yes that would be great! 
________________________________________
From: address@hidden address@hidden on behalf of Christophe De Wagter 
address@hidden
Sent: Tuesday, June 05, 2012 2:42 AM
To: address@hidden
Subject: Re: [Paparazzi-devel] Magnetometer offset int_cmpl_quat

is anyone using aspirin2_i2c and in need of mag? I can fill the missing part.

-Christophe



On Tue, Jun 5, 2012 at 10:39 AM, Felix Ruess 
<address@hidden<mailto:address@hidden>> wrote:
Ah, the aspirin2_i2c subsystem currently does not read the mag (connected as 
slave to the MPU6000).


On Tue, Jun 5, 2012 at 7:36 AM, Romney, Jefferson S 
<address@hidden<mailto:address@hidden>> wrote:
Well, it turns out that I was wrong. the magnetometer does not have a 90 degree 
offset. The autopilot seems to be initializing to North every time no matter 
how the plane is oriented. I don't think it is using magnetometer data at all.
________________________________________
From: address@hidden<mailto:address@hidden> 
address@hidden<mailto:address@hidden>] on behalf of Romney, Jefferson S 
address@hidden<mailto:address@hidden>]
Sent: Monday, June 04, 2012 8:04 PM
To: address@hidden<mailto:address@hidden>
Subject: Re: [Paparazzi-devel] Magnetometer offset int_cmpl_quat

git://gist.github.com/2872011.git<http://gist.github.com/2872011.git> here is 
the url for my airframe file.
________________________________________
From: address@hidden<mailto:address@hidden> 
address@hidden<mailto:address@hidden>] on behalf of Felix Ruess 
address@hidden<mailto:address@hidden>]
Sent: Monday, June 04, 2012 5:37 PM
To: address@hidden<mailto:address@hidden>
Subject: Re: [Paparazzi-devel] Magnetometer offset int_cmpl_quat

Can you please post your full config (airframe file)? Preferrably gist or 
pastebin...
Otherwise it's impossible to tell what exactly you are using....

On Tue, Jun 5, 2012 at 1:30 AM, Romney, Jefferson S 
<address@hidden<mailto:address@hidden><mailto:address@hidden<mailto:address@hidden>>>
 wrote:
This is the magnetometer calibration from my airframe file:

<section name="IMU" prefix="IMU_">
 <define name="MAG_X_SIGN" value="1"/>
 <define name="MAG_Y_SIGN" value="1"/>
 <define name="MAG_Z_SIGN" value="1"/>
</section>
<section name="AHRS" prefix="AHRS_">
 <define name="H_X" value=" 0.5189098"/>
 <define name="H_Y" value="-0.0565782"/>
 <define name="H_Z" value=" 0.8529546"/>
</section>


________________________________________
From: 
address@hidden<mailto:address@hidden><mailto:address@hidden<mailto:address@hidden>>
 
address@hidden<mailto:address@hidden><mailto:address@hidden<mailto:address@hidden>>]
 on behalf of Felix Ruess 
address@hidden<mailto:address@hidden><mailto:address@hidden<mailto:address@hidden>>]
Sent: Monday, June 04, 2012 3:28 PM
To: 
address@hidden<mailto:address@hidden><mailto:address@hidden<mailto:address@hidden>>
Subject: Re: [Paparazzi-devel] Magnetometer offset int_cmpl_quat

If you have an offset, but a correct mag 
calibration<http://paparazzi.enac.fr/wiki/ImuCalibration#Calibrating_the_Magnetometer>
 and have your local magnetic field set, then the mag axes (or signs) are wrong.
Can you please post your config?

On Mon, Jun 4, 2012 at 10:41 PM, Romney, Jefferson S 
<address@hidden<mailto:address@hidden><mailto:address@hidden<mailto:address@hidden>><mailto:address@hidden<mailto:address@hidden><mailto:address@hidden<mailto:address@hidden>>>>
 wrote:
I am using the Aspirin v2.1 with a Yapa and because of the calibration problem, 
I use the int_cmpl_quat AHRS algorithm. But the magnetometer is 90 degrees off. 
With this AHRS algorithm, is there any offset that can change only the 
orientation of the magnetometer and not the accelerometer and gyroscope? if 
not, how do I fix it? Changing the IMU_BODY offsets also switches the pitch and 
roll.

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