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Can't drive the turtle in turtlesim

asked 2011-12-21 02:39:25 -0500

GenePSmith gravatar image

I've just started working with ROS and I'm working through the beginner's tutorial. I am using Ubuntu 11.10. I'm at "Understanding ROS Topics"1.1.2 and when I implement rosrun turtlesim turtle_teleop_key the turtle won't move around with my arrow keys. Is there anything I need to do to set my keys so they will run the turtle?

Thanks, Gene

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answered 2011-12-21 13:32:15 -0500

karthik gravatar image

Hi, The terminal which has

rosrun turtlesim turtle_teleop_key

running should be the active window on the desktop for it to drive the robot. I think this is what is missed. If not you have to post the changes if any that you made or any error that you are getting.

Hope this helps, Karthik

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answered 2011-12-22 13:45:27 -0500

GenePSmith gravatar image

Thanks for the answers. It turns out, as I discovered about 15 minutes after I posted the request that I kept making the turtle terminal the active window and not the "turtle_teleop_key" terminal window. When I made the "turtle_teleop_key" terminal active everything worked fine.

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answered 2020-03-04 11:41:04 -0500

fabbro gravatar image

updated 2020-03-05 14:48:50 -0500

jayess gravatar image

As others already said, you need to make active (by clicking on it) the window where you launched

rosrun turtlesim turtle_teleop_key

But also, another source of error could be that you are not sourcing correctly your environment.

Indeed, I needed in the terminals I was using:

source /opt/ros/kinetic/setup.bash

source ~/catkin_ws/devel/setup.bash

I hope this will help someone

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answered 2011-12-21 19:56:58 -0500

michikarg gravatar image

You can also check if velocity commands are sent on the cmd_vel topic by:

rostopic echo /cmd_vel

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Where you placed the turtlesim package? I have placed inside sandbox, but rospack can't locate it.

RB gravatar image RB  ( 2013-11-08 05:26:47 -0500 )edit

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Asked: 2011-12-21 02:39:25 -0500

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Last updated: Mar 05 '20