Midnight's profile - activity

Got it. I report on.

Thanks a lot =D

Also, I wasn't able to take the wheel apart, since it doesn't belong to me. But from observation, I don't see any debris at all... Maybe suggest a way to debug, please?

Thanks again!

Hey Tully, thanks for the reply. Righto, I did some test and here what I found out:

Twist.linear.x = 1 => Forward and leftwards

Twist.angular.z = 1 => Rotates anti-clockwise while going forward and right

Twist.angular.z = -1 => Rotates clockwise while going back and right (0.o)

Thanks

Hi All,

I was fiddling my turtlebot today and I found something a bit surprising... It doesn't actually go in a straight line!!

I was running the http://ros.org/doc/electric/api/turtlebot_teleop/html/turtlebot__key_8cpp_source.html (.cpp script) from turtlebot_teleop (yep, I made another package and built the script), and turtlebot moves in a arc... Unsure what is happening here and I tried running http://www.ros.org/wiki/turtlebot_calibration/Tutorials/Calibrate%20Odometry%20and%20Gyro (calibration) and guess what, not just it doesn't work but my turtlebot actually goes backwards! lolz

I was trying to find something on the net but apparently no one else has this problem... Any ideas? Is there something wrong with my parameters or is hardware giving me a hard time? Let me know if you need any data/log/code/etc.

Cheers,

Mid

Hardware: turtlebot (the old type)

ROS version: electric

OS: Ubuntu 10.04

I think a more legit way is shifting whatever you are writing here as comments of your original post or just simply edit the original (and adding different edit titles so ppl can trace our progress as well). Mid

Also, I was adviced to re-install ROS diamondback because electric is too high version apparently... Would that be the case??

Hi all,

I just started using turtlebot and I was following the instructions in the tutorials. Everything is fine until this step:

http://ros.org/wiki/turtlebot/Tutorials/Looking%20at%20Camera%20Data

when I try to execute 'roslaunch turtlebot_bringup kinect.launch', a lot of failures comes, which are similar to the following messages:

"[ERROR] [1339737590.517331183]: Failed to load nodelet [/kinect_laser_narrow] of type [pointcloud_to_laserscan/CloudToScan]: Failed to load library /opt/ros/electric/stacks/turtlebot/pointcloud_to_laserscan/lib/libcloud_to_scan.so. Make sure that you are calling the PLUGINLIB_REGISTER_CLASS macro in the library code, and that names are consistent between this macro and your XML. Error string: Cannot load library: /opt/ros/electric/stacks/perception_pcl/pcl/lib/libpcl_visualization.so.1.1: symbol __cxa_pure_virtual, version libmysqlclient_16 not defined in file libmysqlclient.so.16 with link time reference I am unsure what is going on... I tried running it on the turtlebot laptop and the workstation with ssh -X, they both gave me those errors.

I got Ubuntu 10.04.4, ROS electric.

Thanks in advance! Midnight

I'm new to ROS and I'm trying to progress with the tutorial. Currently running Fuerte on Oneiric.

I was trying rosrun turtlesim turtlesim_node

and it gave me this:

(turtlesim_node:2972): Gtk-WARNING *: Unable to locate theme engine in module_path: "pixmap", (turtlesim_node:2972): Gtk-WARNING *: Unable to locate theme engine in module_path: "pixmap", (turtlesim_node:2972): Gtk-WARNING *: Unable to locate theme engine in module_path: "pixmap", (turtlesim_node:2972): Gtk-WARNING *: Unable to locate theme engine in module_path: "pixmap", and a blue screen with nothing in it. This is what it meant to be: http://www.ros.org/wiki/ROS/Tutorials/UnderstandingNodes

I did run a core and make Turtlesim before running and I don't really know what's going on... Thanks in advance.

P.S. I was reading other posts and some claimed that there is a problem with the tutorials. But those posts were about 2 to 3 yrs old...