Question on topic publication
I'm trying to create some sort of base_controller for my motors in C++. I have two question about topics that I cannot answer for now. First, if I read a message on the cmd_vel topic for example using...
View ArticleROS Gazebo reset_simulation or reset_world breaks commands sent to cmd_vel
Hi, I am currently using the tum simulator (which build upon the gazebo simulator) on ROS Fuerte . I want to run algorithms on the simulator, and in order to do that I need to reset the simulation...
View ArticleIndependently change angular and linear velocities (cmd_vel)
Hi people! This is really an easy question for the experts: I am coding some *roslisp/cram* functions where I would like to change **independently** the angular and linear velocity of my robot in...
View ArticleTopic not being created properly
Hello, I am using ROS groovy and I have created a .cpp file that is suppose to use the command_velocity topic in conjunction with ros turtlesim to move the simulated turtlebot in a direction, When I...
View ArticleCreating a teleop node/cmd_vel publisher
I'm trying to piece all of this together and have a couple questions. I am building a robot "Inga" who will run a pair of pittman motors through an Arduino Mega ADK with an Adafruit motor controller...
View Articleturtlebot is not moving with published messages on cmd_vel
Hello, I have a simple turtle_move.cpp file that is suppose to make the turtlebot move in a square. The turtlesim program moves like its suppose to fine with my source code. I am using ROS groovy and a...
View Articleholding a twist message on cmd_vel node
Hi again, I have come up with some code that allows for a turtlebot 2, to go in a straight path for 5 seconds. My problem is that it sends the velocity command for a split fraction of time, Im not sure...
View ArticleHow to increase speed of passing velocity commands to p3dx
Hi all, I am working on a project that requires me to send velocity commands to p3dx robot at a high speed. At the moment the robot takes a while (about 0.2s-0.3s) to change to a new speed once the...
View ArticlePioneer P3-AT Doesn't Move - ROSARIA
I have a concern regarding getting the Pioneer P3-AT to move. I have rosaria successfully installed, and I'm running on GROOVY. I run roscore in one terminal. Then I start rosaria in a second terminal...
View ArticleMake sure geometry_msgs::Twist or cmd_vel units
Hi all, I have confusion about the unit of geometry_msgs::Twist, are they m/s and rad/s? Because I saw the sample code turltebot teleop as well as kobuki teleop, they setup these parameters equal 1.0...
View ArticleHow to use the subscribed cmd_vel?
Hi, i calculate the geometry_msgs::Twist cmd_vel and can subscribe to this topic /myrobot/cmd_vel successfully. But i don't know how to use it, e.g. send it directly to my robot? I mean I can call back...
View Articleproblem with move_base
I am trying to control a bot with a lidar. When i run the launch files to switch on the lidar and obtain the cmd_vel values from rosserial based on odometry data, the cmd_vel is being published by the...
View ArticleHow to implement velocity transformation?
Hi all, i have the velocity topic /cmd_vel, and it's the type geometry_msgs::Twist, it is given in the object reference frame, and now i need to transform the velocity to another frame, such as my...
View ArticleNavigation cmd_vel and TwistStamped
Hello, I've set up the navigation stack on my robot. The issue is `move_base` is publishing the velocity commands on `cmd_vel` whose message is of type `Twist`, but my robot is subscribing to a topic...
View Articlemultiplexing between two topic
Hi i am using P3AT(USARSim simulator) and want to drive it from my **ROS-Fuerte**. what i want to do is, 1. Driving the robot using keyboard (using teleop_twist_keyboard) 2. Automated navigation of...
View ArticleI need to write a subscribe to the cmd_vel for turtlebot
I need to write a subscribe to the cmd_vel topic, where am publishing to turtlebot the gazebo. So I want to return the speed turtlebot through the subscriber, not chei code examples for this case, I'm...
View Articlecmd_vel linear and angular relationship
Hi All, I'm using rqt robot steering to output cmd_vel message which I subscribe to and they control the power of the motors. Linear is fine and +/-100% is controlling the motors fed and reverse okay....
View ArticleWhich topics can i use to receive all turtlebot sensors information?
i already have the turtlebot 2, and i want to subscribe all topics that have any information from sensors. I already subscribe the odom topic and cmd_vel topic, and i want to know which topics are...
View ArticleCommanding simple paths / curves to move_base
Hi I want to measure the power consumption of my robot when it moves on some simple paths. For example I would like to command **a straight movement leading to a curve of a specific radius with a...
View ArticleUse irobot create in gazebo with ROS
hello everyone i follow this tutorial [http://guitarpenguin.is-programmer.com/posts/58100.html](http://guitarpenguin.is-programmer.com/posts/58100.html) to let my robot model subscribe cmd_vel and move...
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