All Questions
45,431
questions
0
votes
1
answer
15
views
What does the .ros folder contain?
Hey guys,
I hope all of you are safe and doing well
I was looking at some files which occupy a lot of storage and noticed the .ros folder occupies the maximum space ...
electrophod
0
votes
1
answer
20
views
Pointcloud2 vs PointCloud2Ptr
Hi, the message i am subscribing to from a topic is PointCloud2, whereas my subscriber callback routine looks like this
...
gyrados10
0
votes
1
answer
16
views
catkin_make unable to find actionlib in its original install location
It seems as though it is looking for actionlib in one of our catkin workspaces. It was installed to /opt/ros/kinetic/share/actionlib.
Is there a way to correct how catkin finds it? Is there another ...
cwillia109
0
votes
1
answer
24
views
Setting orthographic view in Gazebo world file
Is it possible to define not only the camera position in the world file, but also if it the view of the camera should be orthographic or perspective? By default it seems to be perspective.
This ...
flood
2
votes
1
answer
66
views
What is the terminology used to describe control without measurement?
I am currently writing a paper on information theory. In the paper, I will be comparing feedback control ( with observations of the environment, of course) and control without observations.
My ...
- 131
1
vote
1
answer
889
views
Finding torque equation for my robotic arm
I am designing a 5 dof robotic arm, and for that I would like to find a torque equation. However, I am a little confused here:
According to me the torque equation for M1 should be l2m2+l3m3+l4m4+l5m5 (...
- 11
0
votes
1
answer
5
views
Confusion of the unbounded covariance growth of fused odometry with SLAM
Hello.
I'm currently trying to fuse IMU with wheel odometry as an input to rtabmap. IMU provides acceleration while wheel odometry technically provides a pose, but I'm setting it in differential mode ...
cactus
0
votes
1
answer
3
views
$ ROSDISTRO is rolling, although ROS2 Galactic is installed
I have recently installed ROS2 Galactic from source with instructions from the tutorials (https://docs.ros.org/en/galactic/Installation/Ubuntu-Development-Setup.html)
When I open a new terminal, and ...
- 198
0
votes
1
answer
19
views
Right value of magnetic_declination_radians
Hi, I am trying to configure a dual EKF plus navsat_transform setup for robot_localization and I am not sure of how to input the value of magnetic_declination_radians.
Magnetic declination for the ...
gmsanchez
1
vote
3
answers
100
views
Best way to control a robot from an application
I developed an application that places itself just before controlling the robot (CAD/CAM like application) and now I want to control my robot directly within the application.
Typically I have two ...
- 123
0
votes
1
answer
35
views
Blend Radius with MoveIt/ROS/UR5e
Dear all,
i controll my Universal Robot UR5e with Ros and MoveIt. It works all fine. Now I want to add the functionality "movep" that the UR5e has in the UR-Script Language. This command is ...
anonymous74883
0
votes
1
answer
14
views
How to create topics and synchronize them when recording a bagfile
Hello everyone,
thanks for taking the time to check my post. So let me describe what I want to do.
For starters I have a bag file containing a topic which carries a directory path at each message, ...
Ifx13
0
votes
2
answers
91
views
Reinforcement Learning in global and local path planning for mobile robots and self-driving car
Most RL courses start with grid world problem like this where robot has to navigate from start to end and RL helps in generating the optimum policy. (State-action pairing).
I am not able to relate ...
- 145
0
votes
1
answer
48
views
RegulatedPurePursuitController detected a collision ahead but robot doesn't stop
Hello,
We are trying to navigate with obstacle avoidance with ROS2 Foxy and we switch from DWB to the freshly released Pure Pursuit Controller in the Navigation2 stack.
We set a goal in Rviz several ...
- 39
0
votes
1
answer
23
views
run ROS2 in two vs code remote containers
Hello everyone,
I tried to run to ROS2 two nodes in different containers as described here: https://docs.ros.org/en/foxy/Guides/Run-2-nodes-in-single-or-separate-docker-containers.html?highlight=...
__Jeremy__
0
votes
1
answer
7
views
ImportError: cannot import name AddTWoIntsResponse
I am following a tutorial and where my srv file is AddTwoInts.srv
int64 a
int64 b
---
int64 sum
and i have created a server.py file under scripts
...
akash12124234
0
votes
1
answer
5
views
how to fix MAP reference?
hi everyone,
I have one question about the reference of the Map created by Rtabmap. The problem is that when I am in localization mode, and I want to specify a fixed goal for the vehicle, each time ...
Delbina
0
votes
1
answer
7
views
0
votes
1
answer
7
views
Adding dynamic markings on ground plane
I am working on a janitorial robot. I would like to simulate patches on the ground plane (plain black square patches), make the robot detect these via cameras and simulate the cleaning task. However ...
ashwin5059198
0
votes
1
answer
226
views
sensor_msgs/Image
This is my first time dealing with sensor_msgs/Image. I am using ros melodic in ubuntu 18.04. I tried to subscribe the content of sensor_msgs/Image and tried to visualize the data from the msg for ...
jenanaputra
0
votes
1
answer
51
views
Failed to transform the goal pose from map to map frame
Hi,
I tried to run the RRT exploration with the turtlebot3 using the following setting:
But while running the RRT exploration algorithm. I encountered such issue:
The transformation stops at a ...
hikashi
0
votes
1
answer
212
views
Unable to figure out the source for the bad_alloc error
I am getting a bad_alloc error when I try to use the costmap_2d::Costmap2DROS::getRobotPose function inside the ...
- 314
0
votes
0
answers
61
views
difference between particle filter in slam and normal particle filter
I would like to ask you about what is the difference between particle filter when we use it in Slam methods and when we use it normally to correct our sensor measurement.
I mean, is there any ...
- 123
0
votes
1
answer
7
views
Unable to figure out the source for the bad_alloc error
I am getting a bad_alloc error when I try to use the costmap_2d::Costmap2DROS::getRobotPose function inside the ...
- 314
0
votes
1
answer
2
views
custom global planner with multiple cpp and h files
Hi
I have created a custom planner following this tutorial:
http://wiki.ros.org/navigation/Tutorials/Writing%20A%20Global%20Path%20Planner%20As%20Plugin%20in%20ROS
I created the files:
...
Eman.m
0
votes
1
answer
15
views
wrong diff_drive_controller pose calculation?
Hallo,
I am using diff_drive_controller in my project.
I wrote the hw interface which calculates the distance based on the ticks coming from the left and right wheels. I am sending absolut ticks (...
balint.tahi
0
votes
1
answer
112
views
Using diagnostic_updater in a ros2_control resource (actuator etc)
Hi!
In ROS 1 I use an diagnostic_updater::Updater to publish hardware infos like status/error words, current device mode etc.
The usage is pretty straight forward ...
Webadone
0
votes
1
answer
7
views
Autoware car following issue using Open Planner
Hi all,
I am trying to do some field test using the Autoware 1.13 Release + Open Planner. I would like test the car following scenario. The leading vehicle is travelling at 3m/s. The ego-vehicle is ...
yougeyxt
0
votes
1
answer
4
views
Is oculus quest2 available for autoware
Hi
I am handling Oculus Quest2 to visualize the camera or Rviz scene to the device.
I found some oculus supporting UIs in the runtime manager and found relevant documents.
https://gitlab.com/...
Kim_3957
0
votes
2
answers
142
views
Best way to power Raspberry Pi 4 8GB + Arduino Uno Robot?
I am building a robot that uses an arduino to drive 4 mecanum wheels, which will be controlled by a Raspberry pi 4 8GB with the Lobe Machine Learning Hat via a serial connection.
I'm fine with having ...
- 125
0
votes
1
answer
1
view
Calling constructor of custom global planner
Hi
I have created a custom global planner based on Genetic Algorithm.
I followed this tutorial:
http://wiki.ros.org/navigation/Tutorials/Writing%20A%20Global%20Path%20Planner%20As%20Plugin%20in%20ROS
...
Eman.m
0
votes
2
answers
391
views
How can I input joint angles to transformation matrix to get position in matlab?
I am trying to get the forward kinematics for a robot model in matlab (rigid body tree).
I created a 4 x4 transformation matrix from the base to the end-effector using the gettransform() function. I ...
1
vote
0
answers
29
views
Data gathering and selling [closed]
a friend of mine is building various Robots with different structures, sensors, limbs executing different tasks. He gathers data from all sensors etc regarding technical and scientific range of ...
user28932
0
votes
1
answer
4
views
Unable to assign slot to rviz property with custom namespace
Hi all,
I am implementing a custom rviz tool for a certain task, the tool is already working properly and I came up with no errors during the plugin generation. However, when I try to assign a ...
Weasfas
0
votes
1
answer
51
views
Robot_Localization can't subtract times with different time sources
I am trying to use the Robot_Localization with an IMU and Odometry-Topic and face the following error:
...
KNTRL
0
votes
0
answers
184
views
Retrieving Denavit-Hartenberg-Parameters from homogenous transformation-matrix
i am trying to implement a matlab script where the user can enter quaternions and retrieve the corresponding denavit hartenberg parameters for this link. My approach is to create the homogenous ...
- 1
0
votes
1
answer
6
views
How can i spawn pr2 on gazebo?
Hello
I'm trying to do the pr2_simulator_tutorial and i'm blocked in the first tutorial (http://wiki.ros.org/pr2_simulator/Tutorials/StartingPR2Simulation).
I launched empty world as asked in the ...
samourai
0
votes
1
answer
88
views
Problem with Subscriber class from message_filter in Python
I am currently facing a problem, that the Subscriber() is expecting 3 arguments, while in the docs it is always being done with 2:
http://docs.ros.org/en/api/message_filters/html/python/
Therefore I ...
KNTRL
0
votes
1
answer
1
view
What is the stop condition of tracking
When the tracking process is over, what makes it stop? I use waypoint_ Loader, in pure_pursuit Using dialog
I appreciate it if you have any idea.
Originally posted by liuliuliu on ROS Answers with ...
liuliuliu
2
votes
5
answers
751
views
Recommended building materials for building a robot WITHOUT 3D printer?
I have a ton of ideas for building a robot using an arduino and raspberry pi. I have an assembled the wheels and chassis, and now I am left with an ugly raspberry pi and arduino + wires. It works, but ...
- 125
0
votes
0
answers
22
views
Is possible this robot arm cut well around this plastic plate?
Good Afternoon.
I am trying my best to put this Omron Viper 850 6-axis robot arm, to cut around some car plast plates.
The Viper 850 robot is this:
The car plastic plate that supposedly it to cut ...
- 125
0
votes
2
answers
136
views
Best way to add package's models path to GAZEBO_MODEL_PATH in ROS2?
In ROS1, you could add your package's models path to the GAZEBO_MODEL_PATH in package.xml (e....
- 771
0
votes
1
answer
34
views
Galactic/Fast-DDS middleware can't loan messages
I am using ROS 2 galactic and running with my environment set for FastRTPS middleware. I am using the loaned message buffer API and the XML configuration for shared memory described in the Fast-DDS ...
mschickler
0
votes
1
answer
40
views
Bloom an ament_python package with Pip Dependencies
I'm having trouble with blooming a rolling package, possibly because of its pip dependencies.
Failing buildfarm job
source repo
release repo
Key error:
...
- 4,294
0
votes
1
answer
47
views
Get ros params from parameter server
I have 2 ROS nodes running sequentially from a script. Node1 sets some params in the parameter server which are to be used by node2. But node2 starts after node1 is killed. Currently I have a yaml ...
dee-mikey
0
votes
1
answer
4
views
Autoware Auto - Record/Replay a Trajectory in LGSVL
Hi All,
I was trying to use "Record/Replay a Trajectory in LGSVL" from here.
And noticed that the below command does not seem to be working.
...
kk2105
0
votes
3
answers
324
views
Servos jittering problem
So I started building this 3D printed Bluetooth robotic arm that can be controlled via MIT app inventor from HowToMechatronics.com. After connecting all the servos and running the code, the servos ...
- 1
0
votes
1
answer
18
views
Robotic Tasks in relation with components
I will try to ask the best i can:
Our Human Body has parts like arms, legs, head etc. An arm can rotate 360 degrees. Arm has a hand with five fingers which can grip, poke, push etc.
How would we ...
user28932
0
votes
0
answers
111
views
Can a state lattice planner be used purely as a local planner?
I've been reading a bit about state lattice motion planning recently. The question I would like to ask is if a lattice-based motion planning system can be used purely as a local planner without a ...
- 1
0
votes
1
answer
2
views
Can ROS work with a Intel® Xeon Prozessor E5620?
Hi,
we use a HP Z600, which has two Intel® Xeon Prozessor E5620 using Ubuntu 18.04.
My question is:
Can we run ROS Melodic on this constellation ?
We appreciate your answers.
Thank you.
Originally ...
Tricia279