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How to cleanly stop a robot in the destructor of the code

I often use CTRL-C to stop my ROS2 code. However, I wonder why my destructor is not executed or not executed in sequence. According to my log file, the destructor was called: ...
Dom's user avatar
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2 answers
31 views

Send sensor data to update rviz model

I'm completely new to ROS(2) and I want to make my Robot Model in RViz move depending on sensordata. I build my files according to a minimal working example from youtube and it allows me to visualize ...
SchulterPickel's user avatar
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1 answer
30 views

Compatibility of MG996R Servo with ROS and Dynamixel Communication

I am currently working on a robotics project following the instructions in the "ROS Robotics Project" book by Lentin Joseph. The book originally suggests using the Dynamixel AX-12A servo ...
Vincent's user avatar
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1 answer
35 views

How to find the plugin which the sensor should use quickly?

I'm a beginner of gazebo.And I am trying to insert sensor plugins in my SDF file.But I don't know which plugin should use in my file. And I don't know how to find the correct [filename] & [name] &...
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how to draw something using a turtlesimbot and stop that bot, spawn another turtlesimbot at that coord, and draw using the 2nd bot?

...
Anonymous's user avatar
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Ubuntu 20.4/Foxy - Gazebo/Tiago : no /scan_raw topic

Following Rico's book - page 43 - (https://github.com/fmrico/book_ros2) [Ubuntu 20.04.6 LTS / Foxy] I try to run Tiago sim and drive it around a world map with the teleop launcher I run the simulation ...
phil's user avatar
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0 answers
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Mapping for maze solving robot [closed]

I'm trying to implement a program to find the shortest path for a maze solving robot competition but I can't understand how to do the mapping. I tried Breadth first Search algorithm that takes in a 2D ...
Miriam Mathew's user avatar
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1 answer
80 views

Installing both Noetic and Mellodic in 20.04?

First, I am a beginner of ROS. I installed Ubuntu 20.04 on my desktop and now I installed noetic on it since they are used in my project team. However, in my another class, they recommended to install ...
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1 answer
2 views

Why does Subscriber have twist_pub?

I am referring this book called "Programming with ROS" by Morgan Quigley. I am having difficulty understanding this particular code : ...
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1 answer
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UsingRosEd beginner tutorial defaults to Spanish?

Hello, It appears that the beginner tutorial for ROS Editors found at the following link has been changed to Spanish. http://wiki.ros.org/ROS/Tutorials/UsingRosEd Where can I find an English version ...
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1 answer
28 views

Error Compiling Gazebo Plugin

I have been trying to move a model car in Gazebo using a plugin. I first followed the ROS plugin tutorial and everything was working accordingly. I then used the code from this answer but I got ...
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1 answer
55 views

Does anyone know where i can find source code of turtlesim package?

I want to understand how this simple simulator works. I can't find any good explanation. For example, in ros_tuturials they say: run roscore rosrun turtlesim turtlesim_node rosrun turtlesim ...
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1 answer
8 views

How much time do I need (approximately) to learn ROS and create my own package?

i want to create my own package (catkin, etc., + simple URDF model, adding sensors and programming it for autonomous navigation in Gazebo) . I have just started to learn ROS thoroughly. I want to use ...
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0 votes
1 answer
2 views

Network error when trying to launch a node on an other machine

Hello, My distribution is ros-kinetic and I am using ubuntu 16.04 on both machines I am trying to run a node on a second machine (a realsense camera node) by adding this lines in my launch file: ...
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1 answer
13 views

costmap2d: obstacle layer

i want to configure my costmap_common_params.yaml i look up for the parameters in this wiki page: http://wiki.ros.org/costmap_2d/hydro/obstacles but i am using ros-kinetic not ros-hydro Is there ...
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1 answer
8 views

Passing arguments with action client

I want to control an Franka Emika robot using action servers. https://frankaemika.github.io/docs/ros_introduction.html The gripper Operation franka_gripper::HomingAction() is working with: ...
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1 answer
33 views

3D Slam vs. 2D Navigation

Hello, It's a very basic question. Is it possible to do 3d navigation? (robust using LIDaR). (other than rtab (focused on lidar data)) There are slam algorithms which are responsible for 3d slam (e....
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Beginner Tutorial Procedure

If possible I'd like for experienced users to post their suggestions whether this is the correct way, and explain the commands commented as 'black magic' please. Putting together the initial bit: 1. ...
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1 answer
3 views

Best Practice for Suscriber and Publisher

Hi everyone, I heard somewhere that the best practice for a node was to create a file receiving and publishing all the message, and then to collect these datas from another file if we need to process ...
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0 votes
1 answer
8 views

writing a publisher and subscriber and unsure how to finish it

I am taking this edx course on robotics using ROS and our first project is "writing a node that subscribes to a topic and publishes to another. Your code will subscribe to a topic called '...
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1 answer
9 views

ROS Answers SE migration: what is tf

Hey guys, I am all in all pretty new to computer science in general and learning ROS now. came across some tutorials on tf after completing the beginner tutorials. I want to use rososc but that's ...
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1 answer
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ROS Answers SE migration: topic question

ubuntu 16.04 ROS kinetic as per http://wiki.ros.org/ROS/Tutorials/UnderstandingTopics, i have listed my verbose details on topics in use rn: ...
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1 answer
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first 'roscore' and a question arrises- like i'm 5

~beginner decrypting the workings of ROS~ hmm.. how to phrase this.. well, partly, I'm wondering if I need to also be in my catkin workspace before roslaunching... what is the difference between the ...
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1 answer
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nodes and topics -like i'm 5

I am doing the ROS beginner tutorials and am on the 'understanding nodes' one. What actually is a topic? I see that a node is essentially an executable file and they communicate w eachother using ...
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0 votes
1 answer
4 views

Getting CMake Error: 217, when running catkin_make

Hi, I am going through beginner turotials for ROS indigo link to tutorial and I am getting this error message at point 5. Common step for msg and srv, when I run the catkin_make install or catkin_make ...
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1 answer
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What is the most efficient way to control and manage task nodes?

Mainly, starting a task node if a sensor condition is met, running the task node (sensing, processing, and actuating necessary to complete goal), ending the task upon meeting end condition, and ...
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1 answer
2 views

How should premade packages be implemented with packages that I design?

Hi, I am trying to get an understanding of how to combine and use pre-made packages that I design. I am working on an AUV, and I have found ROS packages for a PID as well as other components. I ...
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1 answer
9 views

Which Ros version is the most complete? Indigo or Jade or Kinetics?

I want to install Ros for the first time. but I've heard that indigo is most complete and for example kinetics doesn't have all the packages or isn't compatible with all of them. So which version is ...
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0 votes
1 answer
5 views

how to check roscore command output after writing the roscore command?

after entering the roscore command,it does not show the prompt, hence not able to type roslist . what to do? Originally posted by paper on ROS Answers with karma: 11 on 2016-12-28 Post score: 0
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1 answer
9 views

Getting started with robots from ROS wiki

Hello, I´m trying to start a project simulating a robot from robots wiki but I´m not exactly sure how to program these robots. I followed some tutorials but they all used a launch file from demo ...
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0 votes
1 answer
9 views

actionlib sendgoal arguments

Hi everybody! I'm following the ROS-I tutorial (http://aeswiki.datasys.swri.edu/rositraining/indigo/Exercises/demo/part4.3), and I get stuck when I have to send a goal to the server using the sendGoal ...
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1 answer
2 views

Stuck on spamming terminal Beginner

I am following the book "Learning ROS for robotics programming" and while trying to create a workspace i screwed something up. I rebooted thinking it would fix the problem, but now i am ...
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1 answer
3 views

What processor to use, new to ROS

Hello, I'm not new to Robotics, but I am new to ROS. I am going to learn ROS and I was wanting to know what's a good processor to run with ROS? One that people have run ROS on before with little to no ...
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0 votes
1 answer
2 views

PID controller /pid_enable topic for multiple controllers

Hi all, I am using the PID package to run six pid controllers (So far) on a robot. I'm using the parameters in the launch file to differentiate between the different PID nodes, as described in the ...
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0 votes
1 answer
2 views

Different versions of ROS running on robot vs laptop?

Hi everyone, I'm a ROS n00b and am trying to get up and running with my first ROS robot. Here's my setup: Wild Thumper chassis Raspberry Pi 2 UbuntuARM Sparkfun Monster Moto Shield Arduino Mega2560 ...
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0 votes
1 answer
3 views

polling an event stream

Hi, I'm very new to ROS, and I'm having some issues understanding what the correct way to poll an event stream is. Currently I am reading events from an xbox controller, and I want to present a ...
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1 answer
56 views

bash: syntax error near unexpected token `(' from ROS Tutorial

Currently trying to follow the Gentle Intro to ROS tutorial. I'm attempting to complete chapter 3 and follow these comands ...
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0 votes
3 answers
55 views

fatal error: beginner_tutorials/AddTwoInts.h: No such file or directory , #include "beginner_tutorials/AddTwoInts.h"

...
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0 votes
1 answer
1 view

Ros will not launch ROS_openTLD

I don't why.. I created a workspace cloned ROS_openTLD from https://github.com/Ronan0912/ros_opentld into /src/ source the setup.bash.. but for no reason is ROS not able to find it.. I mean.. it so ...
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0 votes
1 answer
2 views

Warning with ompl

Hello, I have updated my ros packages, now when I use catkin_make or run certain nodes, I obtain: ...
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0 votes
1 answer
2 views

ROS parameters - understanding of a line code

Hi, I found a code on the internet about SLAM and i'm not able to make it function. I need to understand what those code line do: ...
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0 votes
1 answer
3 views

How to begin without a robot for now?

Hello, I'm totally a newbie in ROS but i'm learning. I understand the concept of ROS. My final purpose is to use ROS with a robot in order to try SLAM algorithms and Visual odometry algorithm. (i saw ...
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0 votes
1 answer
5 views

About 2dnav using nav2djs with Turtlebot and compatible packages

Hello, I am working in a project integrates the web_video_server with map navigation capability, I have the following questions about the packages: For the use of nav2djs: The example that is in the ...
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0 votes
1 answer
7 views

[Kinect] About sound streaming

Hello, I want to know if there is any libray that allows ROS to stream over the web the microphone of the kinect, something like the web_video_server. Update: ...
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0 votes
1 answer
3 views

Trouble compiling rviz on Raspberry Pi 2

Hello, I've been following the directions for installing ROS Indigo on Raspberry Pi and am failing at step 2.3 (building the catkitn workspace). The process fails at step 178 of 185, building rviz. It ...
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0 votes
1 answer
2 views

[Kinect]About camera calibration

Hello, I just want to calibrate the camera, but i get this message: ...
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0 votes
1 answer
8 views

About ros_web_video and mjpeg_server

Hello, I know that mjpeg_server is deprecated but for curiosity i was trying to use it whit a turtlebot, I ran the commands as it follows here Wiki for mjpeg and the webpage was loading and not ...
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0 votes
1 answer
2 views

Error compiling ros_web_video

Hello, I wanted to use the ros_web_video library but when I compile it, I obtain the following compilation error: ...
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0 votes
1 answer
47 views

Roslibjs for a client to communicate with simple action Server

Hello, I made a simple action server and client guided by the tutorials, I was able to make everything work. I wanted to take one step more and try to make the action client using ...
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0 votes
1 answer
2 views

About publishing via terminal (turtlebot)

Hello, I was trying to move the turtlebot via terminal and my surprise was that this instruction is not moving the robot ...
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