ros bags

$ rostopic Pub-1 /turtle1/cmd_vel '[2.0, 0.0, 0.0]'[0.0, 0.0, 1.8]'Parametric analysis:Rostopic Pub This command will post a message to a given topic.-1 (single dash) This parameter option causes Rostopic to exit immediately after publishing a message./turtle1/command_velocity This is the name of the topic to which the message is posted.Turtlesim/velocity This is the type of message being published.--(double dash) This tells the command option parser that the next parameter section is not a com

First, the problem descriptionAn error occurred while running Roscore on Terminal: Unable to contact my own server at ..., such as:Second, the solutionThe above problem is caused by the ROS environment variable Ros_master_uri setting error, reset the variable.Open the ~/.BASHRC file, add or modify environment variables ros_hostname and ros_master, and change to:Export Ros_hostname=localhostexport ros_master_uri=http://localhost:11311After you modify a

Error:sudo apt-key adv--keyserver hkp://ha.pool.sks-Keyservers.net--recv-key 421c365bd9ff1f717815a3895523baeeb01fa116EXECUTING:GPG--ignore-time-conflict--no-options--no-default-keyring--Homedir/tmp/tmp. Cpclk5j7k0--no-auto-check-trustdb--trust-model always--KEYRING/ETC/APT/TRUSTED.GPG--PRIMARY-KEYRING/ETC/APT/TRUSTED.GPG-Keyserver hkp://ha.pool.sks-keyservers.net--recv-key421c365bd9ff1f717815a3895523baeeb01fa116Gpg:requesting key b01fa116 from HKP server ha.pool.sks-keyservers.netGpg:keyserver t

Recently, many friends who have used an information apartment (2 m, 35 yuan/month) in Xiamen to work on shanzhai broadband have been contacting me on QQ. What should I do? If you are using Ros, it is easy to use VPN. I have a VPN account that does not limit the bandwidth of Xiamen Telecom (the test results are very good, the latency of my 4 m account is almost the same after the line is lent, and the bandwidth is also unchanged). If you are a user of

also be directly connected to the PC.USB drive required. Https://github.com/poppy-project/pypotAfter installing the driver, you can control the robot through the computer.Video Introduction to Robotics:Https://player.vimeo.com/video/76917854?wmode=opaqueThis super-awesome is a video of assembling robots. Https://player.vimeo.com/video/96262428?wmode=opaqueTechnical information of the project:https://www.poppy-project.org/technologies/5, summaryThe text of this text connection is: http://blog.cs

CameraRrbot Examplerrbot.xacro rrbot.gazebo Using Gazebo plugins with ROS

How to stop an ongoing navigation navigationHow to cancel a navigation goal or what to stop the current navigation?When navigating, canceling the current target point or pausing navigation is a common problemAfter access to information. Find the following command only to stop the other navigation, the car stops:Rostopic Pub/move_base/cancel Actionlib_msgs/goalid--{}OrRos::P ublisher cancle_pub_ = nh_.advertiseActionlib_msgs::goalid First_goal;Cancle_pub_.publish (First_goal);[1] http://answers.r

Let's move on to the ROS Learning series-using URDF to create a robot model in Rviz, one of the 3D observations link uses to continue creating a double-decker trolley with four wheels to turn.a joint that can be rotated1. Change the type of joint to "continuous" so that front_left relative base_link is a rotating device .2. The position of rotation is defined by origin, which defines the new origin of the tyer_front_left at the same time, and its orig

variable is base_local_planner::simplescoredsamplingplanner Type, inherited from pure virtual base class Base_local_ Planner::trajectorysearchf) The interface that is actually intended for external invocation isFindbestpath ( tf::stamped global_pose, tf::stamped global_vel, tf::stamped drive_velocities, std::vector in this function, the first initializes the generator_ and then calls the Scored_sampling_planner_ of the findbesttrajectory interface. The first parameter of the f

There are two ways to build a map of Ros:First of all 1, first download Hector_slam package to your work space under the SRCCommand:Create a new demo.launch in ~/catkin_ws/src/hector_slam/hector_slam_launch/launch/Modify ~/catkin_ws/src/hector_slam/hector_mapping/launch/mapping_default.launchI use Rplidar lidar, the main price is relatively cheapmodifying Rplidar driver filesFound in Rplidar_ros/src/node.cppNh_private.paramChange it to:Nh_private.paramRun after compilation:Roslaunch Hector_sl

Original address: http://blog.csdn.net/sujun3304/article/details/18572017Well, understand the meaning of the various components of the system, or directly into the program real thing from the practice of learning it!But first of all, the public wants to be good its prerequisite, if you are not a fan of vim and Emacs, like Eclipse's graphical interface, this article is for you.The first step:First, make sure your project is created through ROSCREATE-PKG.Assuming your

ROS (7) URDF build their own robot model 1. Build your own model and display it in the Rviz, which requires three files. (1) URDF file: This file is a robot shape description file, mainly including link and joint, need to be written in strict format. Specific reference http://wiki.ros.org/urdf/Tutorials/ (2) Rviz file: Used to configure Rviz related parameters (3) Launch files: Starting Rviz and URDF 2. Specific implementation: . Rviz: Direct replic

No matter what the user deleted after the admin password cleared to empty 　　Teach you how to break the Ros code To get a CD-ROM PE or u disk PE. Then after entering PE. With tools The hard drive that will be routeros. /nova/store/user.dat File deletion That is, you can enter the default admin without password 　　No password to find the sea spider password! Just took over an internet café. The previous supervisor took all the passwo

With the recent use of cameras and lidar to capture data, two different messages need to be synchronized here. Because it's a previously recorded package, you need to set a parameter when playing. Rosparam Set Use_sim_time True Lower playback speed: Rosbag play-r 0.1 stereo_camera.bag--clock --pause In addition, because we read the image compressed, if the direct receipt of compressed data, there will be some problems. Let's say we're recording the information in the bag. /camera_17

the device does not. No image is displayed.After searching, it is possible to find HDMI to DVI. I tried the next HDMI turn VGA is also possible. 2. Also modify the Config.txt file under boot diskTurn on HDMI Hdmi_safe=1 Reference article: http://wangye.org/blog/archives/762/ After startup, you can use the keyboard and mouse, is an arm of the small computer, the start speed is very fast. Quickly enter the operating system. The default user name Pi, directly into the, no login window.Also follow

To write a Ros program using Qtcreator, you must first configure the ROS environment to be added to the Qtcreator environment first. (i.e. ~/.BASHRC file)1 version issue QT4 and QT5sudo gedit ~/.local/share/applications/digiaqtopensource-qtcreator.desktop (qt5 default installed path)When the open file is empty, close. Open files by PathCD ~/.local/share/applications/Gedit ~/.local/share/applications/digiaqt

It is believed that many enthusiasts stop at expensive robot prices. Although with Arduino, but a very weak capacity of the robot car cost also one hundred or two hundred yuan. It is more time-consuming and laborious to build your own robot. So if you're just an ordinary robot enthusiast, or haven't figured out what to do with a robot, let's start with the simulator ... Urdf In order to make our simulator, first we have to understand what is URDF What is URDF. Unified Robot Description format--

Now that speech recognition is hot on PCs and Smartphones, Ros is at the forefront of technology and certainly not missing out on such a handsome technology. Ros uses code from the CMU Sphinx and Festival Open source projects, issuing independent speech recognition packs, and converting the identified voice to text, and then allowing the robot to intelligently process and speak. First, speech recognition p

Ros uses the Rosrun command to start a node, and if you need to start Node Manager (master) and multiple nodes at the same time, you need to use the launch file to configure it. The launch file is a special XML format file, usually with a. Launch as a file suffix. Each launch file must contain a root element. Roslaunch is used in the following ways:$ roslaunch Pkg-name Launch-file-name The following is an example of a typical launch file: LaunchEach

/forums/topic/96-arduino-sketch-to-automatically-calculate-mpu6050-offsets/ The script calculates the following offsets: Sensor readings with offsets: -3 -3 16375 -1 1 -1 Your offsets: -2341 -1472 1260 181-22 7 Data is printed as:acelx acely Acelz girox Giroy Giroz Check that your sensor readings is close to 0 0 16384 0 0 0 Bring the offset into mpu6050 to replace the following value: Supply your own gyro offsets here, scaled for min sensitivity Mpu.setxgyrooffs