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Re: [Paparazzi-devel] Umarim lite 2.0 gyro going crazy

From: Joseph Muhlhausen
Subject: Re: [Paparazzi-devel] Umarim lite 2.0 gyro going crazy
Date: Sun, 3 Mar 2013 18:15:21 -0500

Thank you for your answer Gautier,

I have tried different config files, AHRS settings, power supplies. Nothing fixed it
I have double checked my setup, wiring diagram and everything seems fine. The board actually works well including the accelerometer.

I installed the board on Depron foam, I wonder if it could create a static shock by itself. I usually do not touch or remove the board from the plane.

Unfortunately I do not have a logic analyzer but I am seriously considering it. It is a bit frustrating, but PPZUAV offered to replace the gyro which is amazing customer service and should take care of the issue.


On Sat, Mar 2, 2013 at 12:00 PM, <address@hidden> wrote:

Date: Sat, 02 Mar 2013 10:51:08 +0100
From: Gautier Hattenberger <address@hidden>
To: address@hidden
Subject: Re: [Paparazzi-devel] Umarim lite 2.0 gyro going crazy
Message-ID: <address@hidden>
Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"


These values are really strange. A software issue is pretty difficult to
imagine when looking at IMU_RAW data, except if it is directly related
to the I2C driver and a bad transaction is unlikely to produce this kind
of error. By any chance, do you have a logical analyzer to look at the
data coming out of the sensor ? A still possible that it has been damage
during mounting or because of a shock.


Le 02/03/2013 00:47, Joseph Muhlhausen a ?crit :
> Hello,
> I tried for a few hours yesterday and still no luck. It is not
> perfectly reproducible but if I wait long enough the gyro will start
> acting crazy. (Attached is a plot of the three gyro axis with the
> board steady on a table)
> I have also tried the original Umarim Lite firmware with no luck.
> I am starting to think that it's an hardware problem. Is there anyway
> to know if it's hardware or software related?
> I am using v4.2 and my config file is based off the umarim_lite_v2.xml
> Thanks
> Joseph
>     Date: Wed, 27 Feb 2013 17:34:24 -0500
>     From: Joseph Muhlhausen <address@hidden
>     <mailto:address@hidden>>
>     To: address@hidden <mailto:address@hidden>
>     Subject: [Paparazzi-devel] Umarim lite 2.0 gyro going crazy
>     Message-ID:
>     <address@hidden <mailto:address@hidden>>
>     Content-Type: text/plain; charset="iso-8859-1"
>     Hello everyone,
>     I was happy to have fixed my interference issue,  but when I got
>     home and
>     wanted to do some tests, the servos started acting crazy in AUTO 1
>     mode. I
>     looked at the PFD and it just goes in every direction very quickly.  I
>     tried the different ahrs but it didn't really help.
>     I looked at the raw data, the accelerometer seemed fine. The
>     gyroscope on
>     the other hand had values between 0 to 10000 while still.
>     Rotating the board 90, 180, -90, -180 as well as waiting steady
>     for the
>     gyro to align helped a lot. However when letting the plane still
>     for a long
>     time I can still see the gyro going off once in a while. I am
>     afraid it'll
>     do the same in flight.
>     I saw that Luke had a similar issue but on a stm32 system:
>     I would like to try the same solution but I am not sure which
>     function to
>     use on LPC21/umarim
>     *
>     *
>     Cheers
>     Joseph
> _______________________________________________
> Paparazzi-devel mailing list
> address@hidden

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