Rick's profile - activity

Hi,
I made all the steps of the ROS tutorial that are described in the ROS Wiki (create a catkin workspace and a listener and talker node). Now I tried to Use the programme presented here: https://github.com/ros-teleop/teleop_... .
I copied the files into the src foldeer in my catkin workspace. This one includes now the folder with the named files and a folder "beginner_tutorials" with all the files of the tutorials. After using catkin_make and source devel/setup.bash, I started the node with "rosrun teleop_twist_keyboard teleop_twist_keyboard.py" but then ROS told me that "Couldn't find executable named teleop_twist_keyboard.py below ...".
I tried some other locations for the folder but nothing works. Could you give me an advice how to solve this Problem?

Regards,
Rick

This was the problem. Thanks!

Ok, this solved my problem. Thanks!

Thank you for your answer, but it does not work. I get the error "Access to 'teleop_twist_keyboard.py' not possible: Fil

Sorry, but this don't leads to an success. Just for the case that it help: After typing in "rosrun tel" and preesing the

The CMakeLists in the project folder is like in the example above. I think that I don't need to paste it again. In the s

Could you tell me how I have to do this? I did not changed anything.These both files are like in the example above.

The structure of the folders is like you already said. That's why I deleted the build and the devel folder and used catk

Hi,the four lines (catkin_install...) are already in the CMakeLists file that is located in the folder where also the py

ROS could not find the executable file Hi, I made all the steps of the ROS tutorial that are described in the ROS Wiki

Hi,
I want to receive messages in ROS that tell me which key was pressed on a keyboard that is connected with the PC. I found several examples for other input devices and also some of them treated the keyboard but just with the up and down arrows. Could you tell me if there is a way to receive also messages when the other keys were pressed (like a letter)? Are there preinstalled nodes/programmes?

With best regards,
Rick

Ok, thank you for your answer.

Subscribe to actions on keyboard (press key) Hi, I want to receive messages in ROS that tell me which key was pressed o

Subscribe to actions on keyboard (press key) Hi, I want to receive messages in ROS that tell me which key was pressed o

Hi,
I have MATLAB running on a Windows-PC and ROS running on a separate Linux-PC. Both are connected in a network. On the Linux-PC I started ROS with the command "roscore". On the MATLAB-PC I used the commands

master = robotics.ros.Core

and

node = robotics.ros.Node('/test')

to create a node with the name /test (after specifying the ROS_MASTER_URI and ROS_IP on ROS and MATLAB). I want to declare this node to a subscriber for the /chatter-topic. Messages are published by a talker (Standard node, described in the ROS tutorial). The problem is, that I can't receive messages on the node /test. To specify the publisher, MATLAB advertises the command

sub = robotics.ros.Subscriber(node,'/chatter','std_msgs/String')"

To use this, I have to insert the node name of the talker, which is not know.
My question is, if there is a possibility to receive messages to this topic. If I start a listener in ROS and a publisher in MATLAB, then the message transfer is possible.

Regards,
Rick

Now it works. Thanks a lot!

Thank you for your answer. I also tried rossubscriber without a node, but in the rqt_graph I saw, that the MATLAB node i

Subscribe in MATLAB to a ROS node on another PC Hi, I have MATLAB running on a Windows-PC and ROS running on a separate