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rviz2 does not display an urdf file

Hello everyone, I have a question related to rviz2. I am trying to display an urdf and rviz2 show this: I got the tf but I can't represent the 3D models. Thank you Originally posted by jarain78 on ...
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1 vote
2 answers
666 views

Some doubts regarding SLAM and its technical terms

I have some questions regarding SLAM and some general technical terms used in the context of it. Q1) **Online SLAM vs Offline SLAM**. Can "Online" SLAM be also called "real-time" SLAM? What is the ...
GlassAnimals's user avatar
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1 answer
21 views

Topic Advertise Conflict: md5sum and Datatype Mismatch

Hi everyone, I have been trying to set a GPS position by setting mavros/setpoint_position/global, but faced with this error message: ...
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2 answers
62 views

ROS2 prioritize Wifi over Ethernet by default? (Whitelist Interface)

Ubuntu 20.04, ROS2 Foxy Binary installation, FastRTPS (Default) I was setting up multiple machines using ROS2 Foxy. PC 1 and PC 2: Ethernet with static IP address Wifi with DHCP PC 1 and PC 2 are ...
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1 answer
253 views

Connect LiPo battery to Arduino Motor Driver Shield for RC Boat

Thanks for taking the time reading this question! It is greatly appreciated. What are we doing We (two complete noobs) are building a remote controlled boat from scratch using Arduino compatible ...
user2863494's user avatar
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1 answer
2 views

Ros Installation Win10 | rosout.exe not in directory

Hello Guys, i installed ROS Melodic on Win10. Now when i run "roscore" the following error is displayed to me: ...
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1 answer
252 views

libstatistics_collector: Unknown CMake command "rosidl_get_typesupport_target" (galactic)

Hello everyone, I am trying to build ROS2 from source following the galactic link. While building, I am getting the below error, ...
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0 votes
1 answer
166 views

Off the shelf way to power jetson nano and xavier from iRobot Create 2

I'm making an indoor companion bot, but requirement is that it easily traverse thick carpet, which is common all across the US in houses. Seems no better platform than 'Roomba' which was designed for ...
AwokeKnowing's user avatar
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1 answer
1 view

How do you edit the collison like this?

Here is the picture: I edited the code many time: ...
Garrett Fogerlie's user avatar
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1 answer
32 views

Generic question about the error "Waiting for service /gazebo/spawn_urdf_model"

Hello, I had a generic question about a specific error. It says Waiting for service /gazebo/spawn_urdf_model and the terminal freezes. This usually happens when I'...
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0 votes
1 answer
14 views

Action Server Compiler Error => error: no match for call to ‘(boost::_mfi

Hi all, I have a problem about creating an action_server on ROS1. I have created a few action server programs in the past. But never get this error which i will tell the details of. My action server ...
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2 answers
30 views

Is the translational vector (positon) in transformation matrices in cm or another unit (MATLAB)?

My transformation matrix gives me, for example, x = 0.06, y = 0.27 and z = -0.04 It does not make a lot of sense to me if this is in cm.
Veronique's user avatar
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1 answer
62 views

Count number of collisions while navigating to goal

I have the navigation stack working in ROS Kinetic on my computer. In Stage ROS simulations, I can specify the goal and the robot navigates to it. I need to count the number of collisions (if any) ...
rob_newbie's user avatar
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1 answer
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Getting direction from single universal laser

I have 360 degrees laser coverage around a robot with the data published into a single topic. But because of that I can not tell what laser data reflects right, left, front or back or the robot. Just ...
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1 answer
2 views

Why is the model "head" kept falling down through the another model "chassis"?

the code is here: ...
Garrett Fogerlie's user avatar
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1 answer
2 views

costmaps being updated with data from two sensors of different heights

Hi I have a robot with an RPLidar sensor on top and would like to add an ultrasonic sensor to identify and avoid obstacles that are below the LIDAR line. It is possible? My robot: Let's say the ...
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2 votes
1 answer
148 views

Proper implementation of `pure_pursuit` for ground robots using waypoints

I am trying to understand and implement pure-pursuit waypoint following in 2D map. My questions are: 1. What exactly do I need to record in my waypoint.csv file? To ...
zlg's user avatar
  • 21
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2 answers
17 views

[ros2_control] Combined hw_interface for arm and gripper

We have a robot that's a little unusual in that the manufacturer combined gripper control and arm joint control into a single, unified API. Thus, we can't really instantiate 2 objects to control ...
AndyZe's user avatar
  • 853
4 votes
1 answer
224 views

Why does a motor does not run when a resistor is connected in series between the supply?

I decided to remove the battery (1.6 V 1600 mAh) from my trimmer and to power it via an old mobile charging cable (6 V 800 mAh). So I built a voltage divider circuit, which gave me nearly 1.6 V but ...
mythili charan's user avatar
0 votes
1 answer
15 views

move base for omni?

Hello i am trying to control the omni or mechanum wheels with the move base for autonomous navigation. But as i saw that move base only suppports the diff drive wheels. Is it possible to use move base ...
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0 votes
1 answer
71 views

proper guide to adding a gripper to my robot in rviz2 and moveit2

im currently running ros2 on foxy and using this driver for the UR10e https://github.com/UniversalRobots/Universal_Robots_ROS2_Driver/ which works perfectly fine, but now im trying to add a gripper to ...
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2 answers
44 views

LaserScan rotates when moving

I'm new to ROS, and picked up a robot that used to be able to perform SLAM with gmapping. I'm working on getting it up and running after years of sitting in a lab, but I can't get the robot to map or ...
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1 vote
2 answers
114 views

Reflective surface

Have you encountered the problem of reflective surfaces for realsense camera (d435 or t265) and lidar (A1 or A2). I would like to know what are the ways to solve problems with reflective surfaces for ...
Splinter1984's user avatar
0 votes
1 answer
9 views

Get message published before subscriber start

Hello, I have a publisher node set to publish only once a message right after it started. I have a subscriber node that subscribes to this topic but that is sometimes started a little time after the ...
PatoInso's user avatar
0 votes
1 answer
142 views

Publish Float64MultiArray from command line - ROS2

I can't seem to figure this out: ros2 topic pub /gripper_controller/commands std_msgs/msg/Float64MultiArray lay [TAB COMPLETE] Now the message is auto-populated ...
AndyZe's user avatar
  • 853
0 votes
2 answers
3 views

What is first ? Publisher or Subscriber?

Which among the following nodes should be started first? Publisher or Subscriber. What happens if start subscriber first then publisher? Note: Subscriber is working as intended (printing the received ...
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0 votes
1 answer
3 views

Autoware: How to run ndt_gpu on the platform of Xavier NX

The newest version of master branch code which needs the cuda version is <=10.0. But Xavier NX's cuda version is 10.2. And I have tested the ndt_gpu on my PC(rtx 1050ti, ubuntu 18.04, eigen 3.3.9), ...
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3 votes
1 answer
281 views

Unstable principal point estimation in zoom camera calibration

I have a camera with a 1/2.9" image sensor from FLIR and a 12-50mm motorized zoom lens from Theia. Because the lens is a motorized zoom lens, I tried to calibrate the camera for different zoom ...
sixer's user avatar
  • 31
0 votes
1 answer
27 views

What is the naming conventions for tf_prefix vs ns?

I have not found a clear answer to this, and reading code on Github has merely confused things further. What is the standard naming convention for tf_trees that relate to a namespace for a robot? ...
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0 votes
1 answer
35 views

bt_navigator failing with error `Action server failed while executing action callback: "send_goal failed"`

I am using ROS2 Foxy Nav2 for navigation Slam-toolbox for mapping and localization create_robot for odom When I send a command to the ActionService ...
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0 votes
1 answer
214 views

Rospy: Why does the loop not get interrupted?

I am working on the software for an autonomous Raspberry-Pi based robot which should keep moving for 2 minutes unless an unintended key is fed to it as input. Upon receipt of the unintended key, the ...
a_sid's user avatar
  • 101
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1 answer
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Problem with assigning different colors to segments in PointCloud

Hello, I am trying a segment tracking algorithm. Right now I have 2 segments. I am coloring each segment with different RGB values, pushing the segments into output_cloud which is pcl::PointCloud2pcl::...
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1 vote
1 answer
42 views

Affordable pi like computer for robot

I have raspberry pi in a robot but it seems sdcard is not reliable at all. What are affordable options that could be considered reliable? Pi+USB Flash, Pi+USB SSD, Pi compute module with eMMC, ...
Artem's user avatar
  • 111
0 votes
1 answer
19 views

Do I have to source both ros2_galactic/install/setup.bash and /opt/ros/galactic/setup.bash?

TLDR: Even with a source based install of ROS2, running rosdep will install libraries into /opt/ros/galactic/. To have all packages available in every terminal I ...
ijnek's user avatar
  • 198
0 votes
1 answer
21 views

Can't build with roslaunch as a dependency

I've been given a repo with roslaunch as a dependency in the CMake files, and it fails to build like so: ...
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1 vote
1 answer
1k views

Forward/inverse kinematics and transformation matrices

I have found the homogeneous transformation matrix that can be used to determine the relation between the parent and child links of a robot. This matrix is shown below. $T_i = \left[\begin{array}{ c ...
user463102's user avatar
0 votes
1 answer
9 views

DWA Planner path deflects and prevents smooth movement

Hi, here's the video. Problem occurs at 0:09 and 0:17. When i give goal to the robot, DWA planner produces local path but, after the robot gains good velocity, it produces a local path which greatly ...
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0 votes
1 answer
116 views

Why need joint state and robot state publishers?

I’m learning ROS2 with Foxy and a GoPiGo3 robot. I have built a working ROS2 gopigo3_node on my Raspberry Pi based robot (Ubuntu 20.04) Server, and a basic URDF representation of the body, castor ...
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0 votes
1 answer
335 views

Epson RC+ line numbers

I am programming an EPSON SCARA robot using RC+ 7.4.8. Any error in compiling the program shows in red in the bottom status bar with the error message, program and line number. This would be wonderful ...
E.Aigle's user avatar
  • 113
0 votes
1 answer
6 views

simpleActionClient not connecting to simpleActionServer on seperate computers

This is on two machines both running ROS Noetic on Ubuntu20.04, done with rospy I have a remote machine, which is running roscore. It will run a node which starts an action server. Here is how I start ...
user avatar
4 votes
1 answer
266 views

How to perform decoupling between decision making and action execution in ROS2?

Hi I'm making a robot using: ros2 foxy OS Ubuntu Linux 20.04.2 LTS (Focal Fossa). Linux 5.8.0-59-generic I built an Action based on the tutorial Building an Action Server and Client. Then expanded ...
rasa911216's user avatar
0 votes
1 answer
40 views

No transition matching 3 found for current state

I'm looking at the ros2 lifecycles demo here: https://github.com/ros2/demos/blob/foxy/lifecycle/src/lifecycle_talker.cpp According to the Lifecycles page of ROS2 if an exception occurs in any of the ...
user avatar
0 votes
1 answer
2 views

no messages received in topic after transformation

Hello, we are driving a vehicle with GPS and automated path planning and I recorded the drives. The rosbag is playing great, but I wanted to visualize the driven path to check the accuracy. I tried ...
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0 votes
1 answer
578 views

Can someone explain this yaw angle calculation equation?

Nowdays, I am trying to understand PX4 Autopilot(Drone Flight Control Open Source) attitude control code. But I can’t understand formula below which is in attitude control code description. Can anyone ...
PX4Traveler's user avatar
0 votes
1 answer
4 views

CFG_EXTRAS equivalent for ros2/colcon

We have a ROS1 CMakeLists.txt that contains: ...
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0 votes
1 answer
118 views

How to use STM32 IDE with microROS + FreeRTOS?

As the title says. How do I incorporate the STM32 IDE into my development workflow? Alternatively, is there a suggested development workflow that is better? Originally posted by Bhavesh on ROS ...
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0 votes
1 answer
18 views

SyntaxError: invalid syntax for roscore

I tried to install relaunch roscore on Ubuntu 18.04 but got the following error. Any advice is greatly appreciated. ...
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2 votes
2 answers
625 views

GPS+IMU sensor fusion not based on Kalman Filters

Do you know any papers on or implementations of GPS + IMU sensor fusion for localization that are not based on an EKF (Extended Kalman Filter) or UKF (Unscented Kalman Filter)? I'm asking is because ...
Mark Ucka's user avatar
0 votes
1 answer
8 views

how to inflate STVL's obstacles

Now I'm using Spatio Temporal Voxel Layer in my ROS Navigation.I find that the obstacles STVL detected do not have inflation. I notice that obstacle layer's obstacle have inflation. I don't know where ...
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0 votes
1 answer
55 views

ROS2 Publish and subscribe in same node

I am trying below code where I have a ROS2 foxy node that first publishes camera frames to a topic camera_frame and then is supposed to be listening to another topic drive_topic. I have created a ...
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