Re: [Paparazzi-devel] YNT: Umarim IMU Issue

[Felix Ruess]

Hi Refik,

if you don't configure the AHRS_x_FREQUENCY in your airframe file, it should default to 50Hz in your case.

Can you please confirm that (check the "print config at build time" box in paparazzi center and it should show you the AHRS_PROPAGATE_FREQUENCY and AHRS_CORRECT_FREQUENCY.

Cheers, Felix

On Tue, Aug 27, 2013 at 3:27 PM, Refik Sever <address@hidden> wrote:

Hi Felix,

My paparazzi version is v5.1_devel-155-g3685c50-dirty.

Refik

---

Kimden: Felix Ruess [address@hidden] adına paparazzi-devel-bounces+refiksever=address@hidden [paparazzi-devel-bounces+refiksever=address@hidden]
Gönderildi: 27 Ağustos 2013 Salı 16:25
Kime: Paparazzi devel list
Konu: Re: [Paparazzi-devel] Umarim IMU Issue

Hi Refik,

what paparazzi_version are you using?
In v5.0 and master it is already set to 50Hz by default: https://github.com/paparazzi/paparazzi/blob/v5.0/conf/firmwares/subsystems/shared/imu_umarim.makefile#L18

Cheers, Felix

On Tue, Aug 27, 2013 at 2:10 PM, Refik Sever <address@hidden> wrote:

Hi,

Before I saw the Iman's email, I was unaware of this issue. Our plane had a lot of crashes at the beginning  because ahrs got confused after a big turn or a loop. Today I turned the plane on the ground and saw that the PFD shows totally different after a loop.  

I added these two lines which is described in the issue and now it behaves normally.

I think that it will be good to add something about this issue on the umarim page of wiki to inform beginners.

Regards,

Refik

"Martinmm:

The issue was that AHRS_PROPAGATE_FREQUENCY was not set in the Umarim airplane example configs and defaulted to 60Hz that made it "sort of usable" in normal flying but killed it with a roll or looping. The config files should contain at least

  <configure name="AHRS_PROPAGATE_FREQUENCY" value="50"/>
  <configure name="AHRS_CORRECT_FREQUENCY" value="50"/>
"

From:	Iman
Subject:	Re: [Paparazzi-devel] Umarim IMU Issue
Date:	Sat, 24 Aug 2013 18:51:14 -0700 (PDT)

---

Hello I have a problem with my Umarim_lite_v2 : there is a large delay in reaction of IMU to movements. I'm reading this <https://github.com/paparazzi/paparazzi/issues/366> discussion but I want to know that is there any way for fixing this problem? I'm using Umarim default airframe file on Paparazzi V5

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