All Questions

Filter by
Sorted by
Tagged with
0 votes
1 answer
31 views

registering depth image on different image size

Hi everyone. I do want to register my depth image onto an mochrome image using depth_image_proc register. I do publish the transform between the frame_ids using a static tranform publisher (see launch ...
user avatar
0 votes
1 answer
18 views

How can I restart move_base server?

Sometimes I will encounter such a problem: due to the positioning error of AMCL, during the execution of the target sent to move_base, the robot will be considered to collide with an obstacle or get ...
user avatar
1 vote
2 answers
169 views

How to obtain the Jacobian matrix for this 2Planar without differentiation

Take a look at the below picture, I would like to derive the Jacobian matrix without differentiation. In this Modern Robotics book, the screw theory is used. I've derived the forward kinematic using ...
CroCo's user avatar
  • 2,453
0 votes
1 answer
61 views

Example of ROS2 C++ blocking action request

I'm looking for a C++ example of a blocking action request. Basically I seek the C++ version of this Python answer: https://answers.ros.org/question/377269/a-less-asyncronous-way-of-using-ros2-action-...
AndyZe's user avatar
  • 853
0 votes
1 answer
168 views

Invoking "make -j4 -l4" failed during catkin_make

I want to install the Turtlebot3 package in Ros Noetic. After cloning the git, I tried catkin_make. But got the following error - ...
user avatar
0 votes
1 answer
7 views

How to learn ROS2 properly

Hi, Sorry it is a bit bad topic. My problem is ROS2 is too complicated and hard to track. there is lots of term and there is no proper description of them. For example I want to publish lidar data, ...
user avatar
0 votes
1 answer
5 views

How to implement track/following algorythm in ROS?

Hi! Im working on a new porject in ROS, which consist of controlling an USV robot (unmanned surface vehicle). The things is I have the simulating model provided by Heron (https://packages....
user avatar
0 votes
1 answer
4 views

print UInt8MultiArray values in python

...
user avatar
0 votes
1 answer
7 views

Make global path update correctly when it is invalid

/** * Segment 1: If global path is invalid, update the global path **/ ...
user avatar
1 vote
1 answer
146 views

HW limit servo motor range

I use MG90S servos(180 degree) for my robotic applications. In few places, all I need is a 30 to 90 degree range of the motor. The motors use a 5K pot for control. Can I change this pot to have ...
Balaji S's user avatar
0 votes
0 answers
125 views

DH parameters correct but the MATLAB plot isn't accurate

...
ioneflux's user avatar
0 votes
1 answer
2 views

can't import custum message in python

...
user avatar
1 vote
1 answer
343 views

Error when compiling cv_bridge in Raspberry Pi 4B with Raspbian buster and ROS Noetic

Im using Raspberry Pi 4B, with Raspbian Buster and ROS Noetic. When I tried to compile my catkin ws with a cv_bridge package I got the following error: CMake Error at vision_opencv/cv_bridge/...
bob's user avatar
  • 167
0 votes
1 answer
33 views

Max velocity of turtlebot

Hello, I have been simulating a turtlebot3 waffle pi in Gazebo, and been using velocities as high as 0.5m/s. Looking at the hardware specifications: https://emanual.robotis.com/docs/en/platform/...
user avatar
0 votes
1 answer
26 views

How to generate custom control sets for Smac State Lattice Planner?

https://navigation.ros.org/configuration/packages/configuring-smac-planner.html Link shows " See the Smac Planner package to generate custom control sets for your vehicle ". But was not able ...
user avatar
0 votes
1 answer
33 views

How can I adjust the thickness of the lines in rviz/path

I have tried parameters in .rviz file, but unfortunately failed. Can anyone give me some suggestions? Thanks a lot! Originally posted by Zhou on ROS Answers with karma: 1 on 2021-12-26 Post score: 0 ...
user avatar
0 votes
1 answer
14 views

why do we need the (pid) controllers in ros_control?

For example, I have a robot with a motor controlled by a embeded board and I want to use ros applications to control the robot. Usually, there is a pid , let's say, speed controller implemented in the ...
user avatar
0 votes
1 answer
138 views

Why does ROS2 custom message colcon build give include file errors?

I am new to ROS2, but very familiar with ROS1. I am doing a very minor tweak of the ROS2 tutorial Creating custom ROS 2 msg and srv files and it fails to build. The base tutorial code works fine. I ...
user avatar
1 vote
2 answers
93 views

Minimize Waypoints Why Still Maintaining Distance From Objects for Motion Planning?

I'm working on a project where I want to give instruction to blindfolded participants on how to walk around an obstacle course. I'll map out my room and convert it to a grid map. However, given that I ...
itisyeetimetoday's user avatar
0 votes
1 answer
37 views

How to make a robot arm move in gazebo with ROS 1?

Hi, For a school project I want to move this robot arm in gazebo with ros. I already can load in the robotarm model with roslaunch and start gazebo and move the joints in gazebo, but I don't know ...
user avatar
0 votes
2 answers
41 views

What thread to use for a load-bearing telescoping lift [closed]

I'm trying to find a thread that has good fatigue resistance and strength for a telescoping lift. The lift will lift a weight of around 2-3 kg. I do not intend to spool it as I read that thread with ...
Mushroom1's user avatar
0 votes
1 answer
25 views

Recommended simulator for drone project

I am new to ROS and I would appreciate some help. I am currently working on a drone that does not need someone to pilot it and that is able to pick up objects. I would also would appreciate advice in ...
user avatar
0 votes
1 answer
51 views

How to send arrays with std_msgs/UInt8MultiArray and std_msgs/Float64MultiArray?

Hi! I woul like to send arrays to a node, I've tried with this code, but I think there is something wrong when I try to copy the array values in the data structure... ...
user avatar
0 votes
1 answer
37 views

Robot model falls down in Gazebo when setting <transmission> as EffortJointInterface

Robot model collapses in Gazebo when setting <transmission> as EffortJointInterface. How to fix this? Any advice will be ...
user avatar
0 votes
1 answer
95 views

Park and Lynch $F = ma$ derivation for a single rigid body

I'm having some conceptual difficulties with a derivation presented in the Modern Robotics text by Park and Lynch. Here are the relevant parts: At the beginning of the book, they insist that ${\it ...
HelpMe's user avatar
  • 13
0 votes
1 answer
38 views

serial vs ros-noetic-rosserial

What is the different between these two serial packages? official ros: https://github.com/ros-drivers/rosserial wjwwood: https://github.com/wjwwood/serial Why is the one from wjwwood so popular? ...
user avatar
0 votes
1 answer
31 views

ros publisher not publishing in debug

Hi I'm running my node in debug (vscode) and getting weird results. I have a loop which is publishing to a motor ...
user avatar
1 vote
1 answer
934 views

Simulate Wind in Gazebo - physics_msgs

I am trying to simulate a drone inside an environment with constant wind. I have found a good plugin (link below) and I have done the following to integrate this plugin in my system: include the ...
robo1996's user avatar
0 votes
1 answer
24 views

lifecycle_msgs/msg/state.hpp is missing by build ROS2 UR_Robot_DRIVER

Good evening to all participants. when i'm compiling the last state of the UR driver for ROS2, so i get a fatal error ...
user avatar
0 votes
1 answer
7 views

Get node name within DDS network

I'm currently extracting some information from the ROS network by the use of the FastDDS Statistic module ( https://fast-dds.docs.eprosima.com/en/latest/fastdds/statistics/statistics.html ). However I'...
user avatar
1 vote
1 answer
336 views

Differential Drive Control Techniques

I have a mobile robot that has a differential drive technique. I try to control the robot with PID controller. Is the best way for controlling differential drive robots? If I want to compare different ...
bb0667's user avatar
  • 21
0 votes
1 answer
726 views

How to connect cmd_vel to motor_command in ROS

I have a motor driver for a BLDC wheel. I have successfully made the motor driver and ROS connections and when I send motor_command as in the "user manual" of the motor drivers, my wheels ...
rosrobotics's user avatar
0 votes
1 answer
2 views

[Autoware.Auto] GNSS conversion node not starting

I am trying to run the GNSS conversion node that converts the GNSS data from WGS_84 to ECEF co-ordinates. When I try to run the node for experimentation using ...
user avatar
0 votes
1 answer
1k views

Invalid <param> tag: Cannot load command parameter [robot_description]:

I am using the waypoint_nav package. When I launched the file named outdoor_waypoint_nav_sim.launch, I got the following error: ...
Hammad's user avatar
  • 1
0 votes
0 answers
179 views

Trouble establishing Ethernet connection between UR3 and PC

First of all sorry if this forum is not the most adequate space for this type of question. I am having a hard time establishing an Ethernet/IP connection between my UR3 and my computer, I am just ...
Filipe Almeida's user avatar
0 votes
1 answer
11 views

Run navigation stack on pointcloud only

Hi all, from the SLAM algorithm I use, I can get a mesh or a Pointcloud representation of the map. Can I somehow run the standard navigation stack? My idea is to use a empty static map and use the ...
user avatar
0 votes
1 answer
236 views

How to fix 'no module named actionlib_tutorials.msg error when going through the actionlib ros tutorials

I'm going through the actionlib tutorials and I'm getting this error with the example python script: ...
Leonard's user avatar
0 votes
1 answer
617 views

Using Qt Designer and ROS2 together for a GUI

Hello, I want to create a GUI for my project using ROS2. I do not have any experience in developing graphical applications, so I decided to use Qt Designer for a more "Drag and Drop" ...
ssarkar's user avatar
  • 564
0 votes
1 answer
589 views

DH Parameters of a 2 DOF RP Robot

How can I determine the DH parameters of the robot shown in the figure ? As i know, the z axis should show the rotation axis for rotary joints and direction of extension for prismatic joints, so the ...
Berkay Taskin's user avatar
0 votes
1 answer
2k views

How to control a servo using ROS2 and MICRO-ROS

I am currently using a raspberry pi pico and a raspberry pi 4, So far I have established a connection between the two using micro-ros-agent I have also successfully built and ran the example provided ...
Aniket Wagh's user avatar
0 votes
1 answer
15 views

Configuring ros2_control/urdf with several robots

Hello guys, im hoping, as usual, to get some help. I'm trying to configure an urdf file with ros2_control. What i want to achieve: Start the same hardware interface, but for a subset of the available ...
user avatar
0 votes
1 answer
36 views

Connect to multiple namespaced movegroups from single C++ node

I am working on a two robot set up that uses SMACC state machines in C++, with MoveIt!. In order to control multiple robots from a state machine, I need to run the state machine in a node that is ...
sniegs's user avatar
  • 35
0 votes
1 answer
9 views

MoveIt!2 UR Driver: Parameter has invalid type

I have built ROS2 Galactic, Moveit2 and Main Branch of UR Driver https://github.com/UniversalRobots/Universal_Robots_ROS2_Driver on Ubuntu. By starting like the tutorial from driver with MoveIt I got ...
user avatar
0 votes
1 answer
12 views

Why do I need a sleep before publishing first message to a topic?

I am trying to get an explanation for some code that works. To simplify the general issue, I created a bag file with exactly 2 messages with exact same header time stamp down to nano seconds. First ...
user avatar
0 votes
1 answer
15 views

is URDF usefull in real robot?

I am building a robot and want to ask if urdf file is important when comes to navigation and mapping in real world. Originally posted by offgrid8 on ROS Answers with karma: 13 on 2021-12-19 Post ...
offgrid8's user avatar
0 votes
1 answer
38 views

micro-ros agent only starts for the second time after uC manual reset

Hello, I am building a launcher for a Micro-ROS application running Zephyr RTOS on STM32. I stumbled upon a situation that happens when the agent is started by the second time after being interrupted ...
user avatar
0 votes
2 answers
6 views

Is there a Node for general data frame transforms?

I am looking for a package which uses tf2 to perform semi-generalized data transforms. Based on its configuration it would subscribe to an input topic and transform the message on that topic to a ...
user avatar
0 votes
1 answer
11 views

BT-Navigator transition error

Hello, I am currently working on a multi-robot simulation, you can find the package here: https://github.com/HarunTeper/AuNa When I try to launch multiple robots with the navigation stack (only ...
user avatar
0 votes
1 answer
111 views

gazebo world with roof

Does anybody know of any readily accessible gazebo worlds with a roof? I have several environments without a roof, and one with a roof (that is too high up for the required purpose), i could do with ...
Ben Bird's user avatar
  • 101
0 votes
1 answer
31 views

URDF link not properly fixed to world

Hi, I hope someone can help me out with the following problem. I am using a 'dummy' link to fix the first link of my robot to the world frame. I am spawning my robot using the spawn_entity script. ...
user avatar

15 30 50 per page
1
90 91
92
93 94
906