hangzhang's profile - activity

In the navigation/tutorial/RobotSetup

http://wiki.ros.org/navigation/Tutorials/RobotSetup

I tried to set up my Pioneer 3-dx following the transform configuration, sensor information, and odometry information. But I failed all the time, I don't know how to change those codes to fit my robot.

For example, I feel that the transform configuration is not really essential. How to set the velocity in the odometry information?

Thank you so much, if anybody could give me some advice.

Thanks for your reply. For the first question, if you install ROS on the onboard computer, how would you use ROS with the Pioneer? I mean that maybe you need a displayer to connect to robot and a keyboard and a mouse。

Hi,everyone. I have a Poineer-3DX robot, the onboard computer system now is Windows 2000. I can connect the robot with my laptop(already installed with ROS hydro and Ubuntu 12.04) through a serial line。 My first question is: whether I should install ROS on the onboard computer? If I have to, how to install? The instruction of the installation is not clear.

My second question is :When I send the command

rostopic pub -1 /RosAria/cmd_vel geometry_msgs/Twist '{linear: {x: 0.1, y: 0.0, z: 0.0}, angular: {x: 0.0, y: 0.0, z: 0.0}}'

to the real robot, it can move, but very slowly even I change the linear x velocity to a bigger value, what's the problem? However, if I run the command to the simulator, the change of the velocity works.

Thank you guys.

Hi,everybody.

I start the simulation in the Quick Start, and then try to start the Explore the Gazebo world.After opening the RViz, it won't show much at first, so I need to add some objects to it. But how can I add objects? When I use the cursor the choose a object to the Gazebo world, the object moves following my curse and will not stop. Even if I click the left button, the chosen object followed my mouse. Anybody can help?

Thank you so much. My version is Ubuntu 12.04 and Hydro.

I don't know why your method doesn't work. But I finally figured out the problem. Before inputing: $ rosmsg show Num. I should input these codes: $ cd ~/catkin_ws/ $ catkin_make $ source devel/setup.bash Then the problem is solved. But I still don't know why.

The default editor for rosed is vim. To set the default editor to something else edit your ~/.bashrc file to include: export EDITOR='emacs -nw' But I don't know how to edit the ~/.bashrc file.

In the tutorial Creating a ROS msg and srv ,in the 2.2 chapter, when I input the

rosmsg show beginner_tutorials/Num

I can't see:

int64 num

And when I input the

rosmsg show Num

I can't see

[beginner_tutorials/Num]:
int64 num

either.

What's the problem?