[ros-users] NXT Ultrasonic sensor

[Max B]

I have re-flashed by brick with NXT-G and the ultrasonic sensor now works.
Before I was using lejos.

On Sun, Aug 8, 2010 at 12:46 PM, Melonee Wise <mwise at willowgarage.com>wrote:

> Yes I understand...I need to look into the problem more carefully Monday..
> My thoughts are right now to put a try and catch in for the exception and to
> take another look at the raw nxt stream and see if there is anything I
> missed the first time I stumbled upon this problem.. If you want to work on
> it some more try looking at usbsock.py in nxt_python you can set debug to
> True and look at the data coming over the wire.
>
> -Melonee
>
> On Aug 8, 2010, at 4:49 AM, Max B <skinkworks42 at gmail.com> wrote:
>
> You say this happens periodically, but for me, it happens almost every time
> I run nxt_ros. I have set nxt_ros to respawn in the launch file, and it just
> keeps respawning. I applied the fix noted in Issue 5<http://code.google.com/p/nxt-python/issues/detail?id=5&can=1&colspec=ID%20Type%20Status%20Priority%20Owner%20Summary%20Stars>on the nxt-python bug tracker, but it provided no help either.
>
> From,
>     Max
>
> On Sat, Aug 7, 2010 at 6:08 PM, Melonee Wise < <mwise at willowgarage.com>
> mwise at willowgarage.com> wrote:
>
>> This is a problem in the underlying driver in nxt_python... It occurs when
>> the I2C bus is pulled too quickly by the python library... I will look more
>> into a more permanent fix on monday morning since I don't have a brick at
>> home. For now if it only happens periodically set nxt_ros respawn in your
>> launch file..
>>
>> -Melonee
>>
>> On Aug 7, 2010, at 2:34 PM, Max B < <skinkworks42 at gmail.com>
>> skinkworks42 at gmail.com> wrote:
>>
>> > Hello,
>> >     I am using cturtle from the Ubuntu Lucid repositories, with the svn
>> version of the nxt stack. I am running Ubuntu Lucid x64 with kernel
>> 2.6.32-generic. I have an NXT controller, and I am trying to use it with
>> ROS. I have an ultrasonic sensor configured for use on the robot. When I run
>> nxt_ros with bluetooth, I get the error "nxt.error.I2CError: ls_get_status
>> timeout" when it is setting up the sensors, and nxt_ros dies. When I use
>> USB, I get the error "usb.USBError: No error" and nxt_ros dies. What can I
>> do to fix this? If I comment out the ultrasonic sensor from the yaml file
>> (and just leave two motors and a gyro), the process runs just fine.
>> > From,
>> >    Max
>> > _______________________________________________
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