rqt_publisher "error evaluating as list" with uint8[4] message
Good morning, Using rqt_publisher I can't find the proper way to edit the content of a field (defined as **uint8[4] essuMaxTemp** ) in a custom message type. when I typed in :...
View ArticleDynamixel XL430-W250 does not reach goal position
When placed in position control mode and given a goal position, the motor moves towards the goal position but stops before reaching that position (+- 10 positions i.e. +- 0.88 degrees). Example: If i...
View ArticleIn a Python script, what is the right way to run roscore in background?
I tried this: import subprocess subprocess.Popen(['roscore']) time.sleep(1) subprocess.run(['ls','-l']) But the "ls -l" part is not run because of "roscore". How could I run roscore in background, and...
View ArticleHow do I debug ld error linking tf2 transform of geometry_msgs::Point32
Hello ROS Answers, I'm out of ideas for debugging an linking error on my machine. I need help solving the problem below or advice on how to debug further. **Platform:** - Distro: Indigo - OS: Ubuntu...
View ArticleHow to extract and save the position information from nav_msgs to a text file
I have a topic published named "cmd_local_waypoints" with two waypoints where the robot to go. I need to extract the X and Y position information from the topic and need to save it to a text file. The...
View ArticleHow do I configure the XVLIDAR-ARDUINO MEGA ?
When I run the line rosrun xv_11_laser_driver neato_laser_publisher _port: = / dev / ttyUSB0 This message appears: [ERROR] [1553391719.243142699]: Error instantiating laser object. Are you sure you...
View ArticleWhy doesn't my workspace see a package in /opt/ros/indigo/share?
I installed the people package with "sudo apt-get install ros-indigo-people" which install the people package, people_msgs package and others. But when I try to use the package either by printing out a...
View ArticleCouldn't find executable named um7_driver
Hello All, I brought um7 IMU and following the steps given on http://wiki.ros.org/um7#Software_Installation . I am getting following error when running rosrun command "Could'nt find executable name...
View ArticleHow to use ACADO in ROS
Hi everyone, i am new to the ROS community but I already like ROS a lot, its so powerful and convenient to use. For a recent project of mine, i am looking for a possibility to run ACADO codes as a...
View ArticleConnection refused - docker to docker
Hi, I am trying to establish ros connection between 2 dockers. Details given below. 1. Lets consider I have **docker_1** and **docker_2**. 2. I am able to publish message from **docker_1** and...
View Articleschunk_svh_driver: A trouble during reset
when I use`roslaunch schunk_svh_driver svh_controller.launch simulation:=true gui:=true` to start SVH it states: Driving channel 8 to hard stop. Detection thresholds: Current MIN: -200.000000mA MAX:...
View ArticleNavigation with Localization Module
Hi There, We are designing some mobile tricycle robots that move around in a known environment, with max 3 of them that will work at the same time; we are using a master ROS for the planning and...
View Articleundefined reference in using serial.h
Hello, I tried building a teleop_keyboard package with serial port dependency. The serial port dependency had been installed via sudo apt-get. After doing that, I did a reboot to my computer....
View ArticleSetting up Navigation on Tricycle
Hello! We are designing a three wheeled robot, with the front wheel which act both as traction and steering. For the Gazebo simulation we used the...
View ArticleROS Package for Continental Radar ARS 4-A
Hello, I am working on interfacing a Continental Radar ARS 4-A with ROS. Can anybody help to to find out a ROS package for visualizing the data coming from the radar on the Rviz window?. I have a media...
View Articlehow to make the relationship between velocity and time be linear by python
I created code which making turtlebot 2 following me depend on detecting my face and chose a value of velocity 0.2 m/s my issue is the movement of the robot when disappearing my face suddenly which...
View ArticleCommand line argument passing in rosrun
Hi All, I am trying to pass the command line arguments while running rosrun So that a particular block of code could be executed based on the parameter. Below is the approach. int main(int argc, char...
View ArticleCaculating the distance of a point from point cloud data
I'm getting the x,y,z values for three points as follows: `x : -0.357200 y: -0.205010 z: 0.940000` `x : -0.310266 y: -0.200437 z: 0.961000` ` x : -0.299289 y: -0.140374 z: 0.927000 ` and the point...
View ArticleGet rid of Python and other dependencies
Hi, I am planning on making a minimal ROS installation; either ROS1 or ROS2 is fine. It is supposed to be ported to tiny embedded systems that have little support for the rich dependencies that...
View ArticleHow to get value from a subscribed topic in ros in python
I have the following code from the ros subscriber tutorial: #!/usr/bin/env python import rospy from std_msgs.msg import String def callback(data): rospy.loginfo(rospy.get_caller_id() + "I heard %s",...
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