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Re: [Paparazzi-devel] re: razor imu


From: Oliver Riesener
Subject: Re: [Paparazzi-devel] re: razor imu
Date: Thu, 13 Jan 2011 19:25:52 +0100
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.13) Gecko/20101208 Thunderbird/3.1.7

Hi Felix, Hi Ana,

i have the new analogimu and ahrs_float_dcm codes with razor imu on tiny13 well 
working
at the github branch 0lri/paparazzi. The airplane ist HB_TINY_RAZOR in 
conf.xml.HB.
The code is actual to paparazzi/paparazzi master branch last week.

Thanks for porting goes here to Christoph, Christophe and Felix !

Please merge it into paparazzi master branch, i miss write access.

Ana, you (and your airplane) have still to wait 2:30 min for ahrs_aligner() has 
finished
calibrating the gyro offsets, then the PFD is working ... :-).
I have changed ahrs_aligner() to takes only 1:30 min, without knowing the 
traps. ;-)

Cheers, Oliver



Am 13.01.2011 18:15, schrieb Felix Ruess:
Hi Ana,

I just merged Christophe's fastperiodic branch (which as the name says allows 
to set a separate Periodic/IMU freq, Propagation Freq and Correction Freq). 
Have a look at conf/airframes/TU_Delft/MicrojetCDW.xml if you are interested in 
that.

You might want to have a look at the example_twog_analogimu.xml airframe file. 
But beware that the IMU neutral/sign/sense values are not correct. Maybe 
someone with a razor IMU can actually test this and set the correct ones?

Cheers, Felix

On Thu, Jan 13, 2011 at 12:35 PM, Christoph Niemann <address@hidden 
<mailto:address@hidden>> wrote:

    Hi Ana,

    the integration of the Code was done by Felix and Christophe in December, 
as you know. I for myself didn't have the time yet to evaluate, that the code 
in the main branch is working, so I'm afraid, I can't help you with that, yet. 
But if you just want to try if your Hardware and you Code is working, or you 
want a logfile of a working instance of the Razor-IMU, you might want to have a 
look at this: http://paparazzi.enac.fr/wiki/User:Christoph
    There i described my setup and there is also a link to the github branch, 
I'm actualle using. Perhaps it helps.

    Good luck

    Christoph

    Am 13.01.2011 09:57 schrieb "GARCIA ALVAREZ, ANA" <address@hidden 
<mailto:address@hidden>>:


    Sorry I ask again, I am trying to incorporate a razor imu into a fixed wing 
aircraft.

     I don’t know if it should work with the current software in the main 
branch or if I should change anything. I know the autopilot gets the values 
from the adcs, because I can see them in the messages accel and gyro.

    But I don’t have evidence that these values are used in order to let the 
autopilot know the attitude of the aircraft(the attitude message is fixed and 
the PFD doesn’t move)-I assume this is the difference between using an imu or 
the ir sensors-.

    What files should I look for? Is there any branch where they work and I 
could have as reference?

    Another question related to the imu is that the sensor outputs only change 
from one unit to another. I mean, with the accel values in m/s2, the z 
component is 10 (9 or 11), not intermediate values.Changing the “sens” 
parameter I get 100, but no more accurate. Is it the normal behavior?

    Thanks


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