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

[refik]

Hello,

I changed the gyro (ITG3200) on umarim Lite 2.0.  Accelerometer was working
before, however, both the accelerometer and gyro does not respond now. I
looked at the SDA and SCL pins with an oscilloscope, the signals are
changing and it seems OK. However, in the messages window of GCS, the
variables in IMU_GYRO and IMU_ACCEL are all zero. They are blinking with
green, therefore I think that gyro and accelerometer send data from I2C
port, but they send all zero.

Do you think that they damaged while we heated the gyro? We were careful
about ESD.

Joseph, did you solve the gyro problem?

Cheers,
Refik


>Hello,

>I also have the same problem. I left the umarim board open for 3 days. When
I came back, I >saw exactly the same gyro problems that you describe.  I am
waiting the new gyro to >arrive.
>
>I think that it is an hardware problem, and I will try to change the gyro.
I did not >grounded myself, the damage maybe occurred due to this.
>
> 
>
>Cheers,
>
>Refik
>
> 
>
> 
>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.
>
> 
>
>Joseph
>
> 
>
>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"
>
>Hello,
>
>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.
>
>Gautier
>
>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:
>>
http://lists.gnu.org/archive/html/paparazzi-devel/2011-12/msg00118.html
>>
>>     I would like to try the same solution but I am not sure which
>>     function to
>>     use on LPC21/umarim
>>     *
>>     *
>>     Cheers
>>     Joseph
>>
>>
>>
>> _____________________________