Questions tagged [ros]

ROS (Robot Operating System) is a free, open-source robot software framework initially developed by Willow Garage. And now under the maintenance of Open Robotics.

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37 views

Rviz Status Error in Costmap: Update area outside original area

“update area outside of original map area” is the error I get when visualising the topic /move_base/global_costmap/costmap. The cost map displays correctly, there is nothing on google or the docs to ...
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31 views

RGBD Camera Compatibility with ROS

I am looking for a good RGBD Camera that I want to use with ROS. Is there a way to know if a camera will work with ROS? Or is it that every camera is compatible with the usb_cam node? I want to send ...
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1answer
30 views

Eliminate grey space around the saved map

I have mapped my Gazebo environment using the slam_gmapping node. On running ...
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1answer
59 views

Localization and Mapping in a Small Crop Field

I have a small crop field inside my house and I want to create a map of it. The goal is to create a map so that I can monitor the growth of the plants and do some post processing to analyze the ...
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110 views

LEGO-LOAM: Creating and Saving a Map

I have implemented LEGO-LOAM on my system. I have a velodyne VLP16 lidar. I am getting a display like this in the rviz window. I need help in creating and saving a map from this data. What should I do?...
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1answer
44 views

Is it possible to setup a wireless network without internet for the robot and PC?

The system includes three devices: PC, robot's computer, and wireless device. In order to improve the signal quality of the wireless in the whole robot's environment. I'd like to put a big wireless ...
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1answer
70 views

Learning ROS for Absolute Beginners in Robotics [closed]

I am a student studying in 11th grade. I have some knowledge about python (more than what an ordinary student in 12th grade will have). I also have some knowledge of C# as I have been creating games ...
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2answers
46 views

Is this encoder error expected?

I'm working with the iRobot Create 2. When I read the encoder count and sum it for total, I'm able to do so without apparent error. I've used this to 'successfully' estimate position combining with ...
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1answer
71 views

AttributeError: darknet_ros_3d instance has no attribute 'Xmin' [duplicate]

After publishing the messages from another package, I am using darknet_ros_3d package and writing a subscriber. For saving the messages into variables for the later use, I am following the answer ...
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1answer
77 views

How can I save messages publishing from a ROS package into a variable?

I am using darknet_ros_3d package and writing a subscriber. So far, I have followed the code given as under: ...
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1answer
37 views

How to handle curved paths in maze

-I have an RPi on Ubuntu with ROS (Kinetic). The task is to solve a maze. I have implemented a left-hand algorithm to navigate through the maze. -The robot is equipped with 3 ultrasonic HC-SR04 ...
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1answer
139 views

How to subscribe message coming from a package of ROS into Python code of another package?

I am using darknet_ros_3d package and getting the published 3D coordinates. Now I need to subscribe these coordinates into a Python file (...
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3answers
235 views

ROS Webcam Stream Really Slow

I am trying to stream the images from my camera to a VM via ROS. Here is my setup: Raspberry Pi 3B+ with Picamera v2. It is running ROS Noetic with cv_camera_node ...
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12 views

Mavproxy command returns no link

I have been having trouble in connecting the mavproxy.py script to the dronekit-SITL. I have tried mavproxy.py - - master tcp:127.0.0.1:5760 - - out udp:127.0.0.1:14550. The udp connects to the ...
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1answer
51 views

Inverse kinematics in KDL without rotation

I am trying to use KDL to do inverse kinematics. However I am not interested in the orientation of the end effector, but only in the location. Is there a way to specify this in KDL? The function ...
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1answer
15 views

Multi-Agent simulation causing trouble in Rviz

I'm trying multi-agent simulations using ROSBOT 2.0 by husarion. I'm comfortable with single agent but when it comes to multiple agents I'm able to spawn them and control them independently but the ...
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1answer
79 views

What is the Point of Monocular SLAM

I am not a V-SLAM expert yet, but as far as I understand with monocular V-SLAM there is a scale ambiguity introduced by the fact that a camera essentially is an azimuth sensor that maps the 3D world ...
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1answer
54 views

Determining (Heading) Yaw to rotate the Turtle Robot to desired point (X,Y) so it moves towards it

I have a turtle bot and I want to modify its heading so it moves to certain point (x,y) in the world. Now I reckon that yaw is angle from robots reference, how do I determine the yaw as the point (x,y)...
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1answer
280 views

Tried to advertise a service that is already advertised in this node [/leo/controller_manager/list_controllers]

I'm trying to do a multi agent simulation using leo_rover which is open source. I'm comfortable with single system, but when I add a second robot using namespaces i get the second robot spawned in the ...
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2answers
67 views

Where to learn ROS? [closed]

I am trying to learn ROS and so I was looking for some guide or tutorial series. I already managed to set up ROS Kinetic on a Raspberry Pi and ROS Noetic on a Ubuntu VM. I am quite experienced in ...
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1answer
128 views

Gazebo freezes on vm after running roscore

I'm a beginner in ROS, since the learning curve for ROS is steep i decided to use a book to learn how to use ros ([ROS Robotics Projects - Second Edition][1]). I'm currently on the third chapter. I'm ...
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0answers
36 views

CHOMP Planner freezes rviz Motionplanning in ros

I am trying to use the CHOMP planner for my custom robot by following the tutorial. After setting everything up as shown in the tutorial, I tried to plan a very simple movement. As one can see in the ...
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25 views

Robot doesn't load properly in Gazebo when inertia values are small

The complete question is posted here.
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1answer
184 views

Failed to load plugin libgazebo...: libgazebo...: cannot open shared object file: No such file or directory

When running a command similar to the roslaunch gazebo_ros empty_world.launch of the Tutorial: Using roslaunch to start Gazebo, world files and URDF models, I get ...
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1answer
52 views

pid tuning the wheel velocity

I am using diff drive controller to control the wheels of my robot. Here i am trying to use the control toolbox pid class for making the input velocity and velocity measured from wheel encoder to be ...
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1answer
67 views

What causes rviz black screen at startup?

I have been running the same rviz conf for months and mostly have had no issues. But lately there is often a black screen at rviz startup and it happens seemingly randomly, without any error messages ...
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1answer
266 views

Hector_navigaton on ROS Melodic error

I'm a newbie on robotics, and currently, I'm working on a project to make an autonomous robot that can mapping the surrounding environment and decide the shortest route towards the goal while avoiding ...
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1answer
77 views

How to make two frames relative to each other

I have a Velodyne and camera that both have transformations specified relative to the origin of the robot. The original transformations were specified as yaw, roll, pitch, x, y, z. I wrote a script to ...
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1answer
262 views

Is it possible to use ROS2 real-time on a computer and connect to the robot actuator using a CAN bus?

I am using ROS2 real-time (still a lot to learn) to implement the various control element of my robot : SLAM, path planning, controller, etc... For the first step of prototyping we would like to build ...
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1answer
125 views

Solidworks to URDF for robot arm with complex joint's

I've tried to create a URDF model of an arm robot similar to the following links using Solidworks to URDF plugin. This plugin creates a hierarchy relation between joint and links in any robot ...
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0answers
28 views

Ros Kinetic teb_local_planner computation issue

I have very limited experience in operating systems and compiler, and most of my experience is with integration and control systems. Currently I am using ros kinetic with teb_local_planner for ...
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1answer
124 views

How to add, additional prismatic joint to the end of Universal robot last joint inside URDF file?

Could you please tell me how can I add, additional prismatic joint to the end 6th joint in URDF file of an Universal robot as in the link below: https://github.com/ros-industrial/universal_robot/blob/...
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49 views

To calculate roll,pitch and yaw

How do I calculate roll,pitch and yaw value from the position co ordinates of the drone, that is x,y and z from the gps sensor??? Using the x,y and z co ordinates I have to calculate roll,pitch and ...
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1answer
77 views

Error when "catkin_make" is run

I cloned a gazebo ROS package from https://github.com/YugAjmera/omni3ros_pkg and if I try to do catkin_make,I get the following error. I am using Gazebo 11 and ROS Noetic and i've made sure to source ...
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1answer
103 views

What's the correct approach to merging of localization and odometry data?

We've got a mobile platform with a source of odometry and an IMU, which are merged in an EKF filter (robot_localization node), producing continuous odom->base_link transform. The robot is also ...
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39 views

Setting An Initial Pose Rotation In ORB SLAM2

I am running ORB SLAM 2 on a drone with a downward facing, RGBD camera. I'm using Gazebo to simulate and Rviz to see the vision_pose ROS topic (the orientation/...
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1answer
160 views

ROS Navigation stack with Omni-wheel robot

I have worked through navigation stack on diff-drive, I'm wondering how to get the stack running on 4 wheeled Omni-wheel robot equipped with Arduino and how to get odometry from 4 wheel encoders It ...
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0answers
9 views

I get an error when I try to install ROS on VMware fusion 12 pro

I'm trying to install ROS on my VMware fusion 12, but after updating the bash file as per the installation document, I get an error when I enter roscore in the terminal. The error seems to be that my ...
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1answer
130 views

Error in Pose(): All values are zero for turtlesim/Pose

Here is the program I have written. The function is to make the turtlesim complete one revolution, with a fixed angular velocity and speed. ...
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0answers
14 views

How to use data collect from lidar to generate a 2d map with

I'm new to robotics and I'm using ros noetic with the package rp_lidar. I want to use the data collected from my a1m8 slamteck lidar and generate a 2d map for my rover to navigate and avoid collision. ...
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2answers
572 views

ROS TURTLESIM using PYTHON

In ROS TURTLESIM, While moving the turtle in circle using the linear velocity and angular velocity , how do i track the distance so as to stop the turtle moving after one revolution ??
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27 views

How to list all topics of a remote node

I am new to ROS and have inherited simple code to subscribe and monitor topic on a remote node. The code is using ws4py's WebSocketClient, connecting to ...
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0answers
106 views

Why can't the Controll Spawner find the expected control_manager ROS interface in a docker container?

I'm using ros-melodic in a docker container based on the osrf/ros:melodic-desktop-full image. What my docker file does: My Dockerfile installs the jackal's robot ...
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2answers
44 views

"catkin_make" prompts "+make" and "recipe for target ... failed" errors

I have been working on a ground vehicle project for some time that has bunch of sensors, until now I have managed to overcome the problems I have encountered. I have used catkin_make many times and ...
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1answer
171 views

List of tuples as argument in ROS2 launch

I'd like to define an argument in ROS2 launch file which is a list of tuples. How should the list in default_value be formatted? ...
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2answers
80 views

No ROS 'sourceing' anymore after installing rosdep2

My ROS-system was working pretty well. Then, I installed rosdep by using sudo apt install python-rosdep2, which ended fine without showing any issues. Then I issued ...
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1answer
340 views

Running ROS, Gazebo and RViz on Macbook

I have recently started learning robotics. Being at uni, I had access to Linux PCs where I could easily run ROS and Gazebo. However, due to the current pandemic and closure of universities, I now have ...
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1answer
155 views

Estimate noise covariance matrix of measurements using a ros-bag

I am facing the following issue, and some hint or orientation would be great. I am working on a project in which I was given a ROS bag, and I have to implement a localization node using SLAM. To do so,...
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0answers
35 views

UKF for radar implementation

I'm struggling to implement Unscented Kalman Filter for tracking objects using radar. My state vector contains [x y z vx vy vz] and I can measure [rho phi theta velocity]. So everything looks trivial ...
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0answers
266 views

ROS Laser Scan rotates with the robot in RVIZ

I am currently working on developing a ROS application for autonomous navigation using AMCl. I am first trying to get move_base to work before continuing with AMCL. ...

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