Questions tagged [ros]

ROS (Robot Operating System) is a free, open-source robot software framework developed by Willow Garage.

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4answers
165 views

Building a stationary robot. ROS the right tool for me?

I'm wondering if ROS is the right system for me. I'm currently involved in a project which consists of building a device that has the purpose to take spectroscopic measurements using a laser and a ...
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1answer
43 views

Does anyone have documentation for a CoroWare Explorer?

I have inherited a CoroWare Explorer from someone who used it for their PhD research years ago. They have no documentation on the robot, and I cannot find any online. Does anyone have a user's manual ...
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1answer
328 views

How to convert PointCloud2 message to a grid?

I'm using a Velodyne sensor which publishes on /velodyne_points topic, and its class type is PointCloud2. Now I want to convert ...
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1answer
169 views

How can i connect to AWS Robomaker simulation job using ros_bridge?

We have a web app which we are using to show details of robot on including video, position and feeds like lidar feed. We are using http://wiki.ros.org/rosbridge_suite Rosbridge for this successfully ...
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0answers
29 views

Robot rolls and rotates with different parameters

I am currently trying to build a robot with ackermann steering. As an example I found https://github.com/trainman419/ackermann_vehicle-1 for this robot. It works pretty well with the set parameters ...
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2answers
493 views

Calculating the distance of a point from point cloud data

I'm getting the x,y,z values for three points as follows: x : -0.357200 y: -0.205010 z: 0.940000 ...
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5answers
2k views

Why my robot is lying down in gazebo simulator?

this is my first post about ROS and Gazebo also I am new in ROS. I spawn KUKA robot in Gazebo using urdf file from KUKA github repository following answer from this question I spawned my urdf file in ...
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1answer
986 views

ROS how to use published data in a python script (darknet_ros)

I'm writing a python script to run with darknet_ros and bebop_autonomy package in order to take the bounding boxes of the detected objects and depending on the position of the detected objects send ...
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0answers
70 views

Real-time python reinforcement learning library

I'm looking for a reinforcement learning library that can be used for real-time robot control. What I first had in mind was ROS to describe the robot, Mujoco to simulate physics, and OpenAI gym to ...
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0answers
291 views

Gazebo crashes and burns launching empty world in new package [closed]

I'm launching empty_world copied into my package with the command roslaunch my_package empty_world.launch. Here is ...
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0answers
379 views

Looking for a model in a gazebo

I have a small world file, say ...
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2answers
2k views

rostopic list not showing topic

When I use the rostopic list commands, the output is only returning /rosout & /rosout_agg...
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1answer
139 views

Technologies needed for indoor and outdoor navigating robot

Before I begin, I should add that I am a complete beginner in robotics and hope that I can figure out where I should start by asking this question. I am trying to make a robot that is able to ...
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2answers
171 views

ROS Theoretical Question - How does work properly a node

I'm new at ROS and I'm trying to figure out how does the node works with a pyton/C++ code. I have two codes for the same situation: Use a Xbox Controller to move the turtle in turtlesim FIRST - ...
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1answer
20 views

If you move the RGBD camera to other places on a Turtlebot, same orientation, create a map, does ROS navigation stack with AMCL still works?

I got a Turtlebot, and I’m thinking of putting the RGBd camera to other places. If you move RGBD camera to other places on a robot, same orientation, create a map, does ROS AMCL still works? I am ...
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0answers
496 views

Have you done take-home robotics(ROS) coding test in interviews?

Have you done take-home robotics(ROS) coding test in interviews? Do you want to share the coding test instructions with me? or point me in the right direction where I can find some to practice? I'm ...
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0answers
79 views

How to use MoveIt and ros_control (from setup assistant) to control Gazebo robot?

I've noticed that in the MoveIt setup assistant, there is a "ROS Control" that auto-generates 2 files: - ros_controllers.yaml - ros_controllers.launch I wanted to ask if it was possible to use these ...
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1answer
488 views

How can I preserve a high framerate while using at least 1280x720 resolution on 2 USB cameras on the same computer?

To expand on this, I have a down-facing camera using the whycon ROS node on Ubuntu 16.04 Kinetic on a quad-core computer with 640x480@60fps MJPG video. I'm also using the ...
3
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1answer
3k views

Is rospython subscriber thread safe?

I'm trying to write a python node, which has one class and two member functions as callback functions. so a TimeSynchronizer and Subscriber in a node. I saw in this link and tested that python ...
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2answers
327 views

Libraries to simulate path planning in a dynamic environment for a 2D space

I need to simulate a path planning approach for a 2D space where the obstacles are moving. Initially, I need to implement probabilistic road map, D* lite, A* and Bug2 algorithm. The robot needs to be ...
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2answers
1k views

Inverse kinematics for differential robot knowing linear and angular velocities

I have a differential robot and I am using ROS to run it. When I need to move the robot, I can send commands to it, specifically linear X and angular Z velocities. Linear X is in m/s whereas angular Z ...
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1answer
96 views

Running ROS on Digital Ocean?

Has anyone done this? Create a "droplet" or whatever they call it and set up ROS, and be able to actually run roscore, gazebo, rviz, etc. from there? I can imagine various complications, like having ...
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1answer
110 views

Subscriber to array type overwriting data from different publishers!

I have been witnessing some bizarre behaviour with my very simple node. I have a custom message that contains uint8[] type (it's 8 elements long). I have a ...
0
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1answer
857 views

Why no cmd_vel topic when running Turtlebot simulation on ROS + Gazebo?

I have been having a very difficult time trying to understand why my system does not have the cmd_vel topic. I am trying to get a ROS system running with Gazebo so that I can work through tutorials ...
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0answers
132 views

Convert sonar scans to Lidar scan file

Has anyone tried to map environments using Sonars or 1D ToF sensors? Since it's very difficult to implement such an algorithm from the scratch, I'm planning to use an existing ROS packages such as ...
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0answers
58 views

Writing IMU accelerometer data into as twist messages into cmd_vel

I am reading accelerometer data from the wiimote /wiimote/state topic. A sample of the data I'm working with is as follows: ...
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2answers
381 views

setting custom variables on catkin workspace environment

I am developing a package for the ROS, in fact, it is a package of resources/models for the Gazebo, and I need with the presence of this package in the Workspace of Catkin to automatically set the ...
2
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1answer
59 views

ROS CMakeLists.txt confusion

I am using Ubuntu 16.04 LTS with ROS Kinetic distro. I have a custom package called gps_msgs in my catkin_ws directory. I have other two packages that utilize the message by including it into source. ...
2
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1answer
565 views

Spherical (Ball) Joint in Robot Model not Working in Gazebo

I'm having trouble including a spherical/ball joint in my robot model. I have tried using the 'ball' joint type defined by sdf (http://sdformat.org/spec?ver=1.6&elem=joint#joint_type) but the urdf ...
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1answer
507 views

Simulating the robot using moveit with ROS

I'm an absolute beginner in this field so I request you to help me although the question seems very silly. I want to send the robot (in simulation) pose goal from ROS node. I want to use to moveit ...
12
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2answers
11k views

ROS: catkin_make vs. catkin build

When using ROS: Why should I use catkin build from catkin_tools instead of catkin_make? I've been told that ...
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2answers
384 views

Control a DIY Robot Arm Kit Educational Robotic Claw Set with ROS

I've just started robotics and ROS and I wondering if I can control a DIY Robot Arm Kit Educational Robotic Claw Set (I think its motherboard is arduino). You can find the kit here. Can I use ROS to ...
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0answers
26 views

Fiducials in conjuction with AMCL

I'm having some trouble getting fiducials (using aruco_detect) to work alongside amcl. The goal here is to use normal amcl localization when a fiducial is not present, and to switch to localization ...
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2answers
955 views

Mobile robot navigation without static map

I am working on an autonomous mobile robot based on ROS. All the tutorials and examples requires a static map which need to be generated in order to do the localization and mapping. Do i need to ...
2
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0answers
111 views

How rational is it to use Intel Realsense for my affordable indoor autonomous robot?

Right now, I am using ESP32 for the motors and planning to add either Raspberry Pi Zero or ARM Cortex-M4 (STM32) and use ROS with Intel RealSense RGBD camera. How sensible is it? I am not expert in ...
0
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1answer
586 views

Does SolidWorks CAD-to-URDF (ROS robot definition XML) exporter works from open source alternatives (e.g. FreeCAD, Blender) as well?

It is quite hard (or almost impossible for large robots) to hand code ROS robot definitions in URDF XML files, so that is why SolidWorks has model exporter http://wiki.ros.org/sw_urdf_exporter. ...
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1answer
1k views

ROS for Ubuntu 18.04 and x86

I am trying to put ROS on my Intel-based Ubuntu 18.04 laptop and it seems by the documentation that they only made if for Amd? Am I missing something. It never finds any of the packages. Unable to ...
2
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1answer
538 views

Is this SLAM performance typical or am I doing something wrong?

I'm experimenting with SLAM for the first time. I am using ROS on a Turtlebot3, which has a Raspberry Pi and a single Lidar sensor, Robotis LDS-01. I am running a configuration with three computers, ...
5
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1answer
526 views

Wait simulation time in a non realtime ROS simulation in Python

I want to control a quadrotor with a Python script and run the simulation as fast as my laptop can, not only in real time. I've modified my world and now the simulation runs with 7-10 real time factor....
0
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1answer
50 views

Adding encoders to Nomad 4WD

i have a nomad 4wd rover kit but i saw that motors doesn't have encoders. But to use odometry with ros i need it. I cannot found any suggestion on google search, so i ask here if someone could route ...
2
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1answer
792 views

Calibrating Logitic C920 HD 1080p using ros kinetic

I am trying to follow the ROS monocular camera calibration for a USB camera I have, but the calibration routine fails when I try to run it. I was expecting to see an image like the one below, but I ...
0
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2answers
1k views

rosservice via Python

I have a drone which has certain services, say random.srv. I want to use this service via Python. Now I know that there is a page in ROS wiki that tells you how to create a service client in Python. ...
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3answers
5k views

Alternative to ROS? [closed]

This might be a tricky question, but having dug in deep with ROS I am noticing the complexity that one has to deal with. Simple Arduino programming is much simpler but of course can’t do many useful ...
2
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2answers
347 views

ROS: Sensor data via USB

Im working on a project and i want to use a sensor. I can plug in the sensor via usb. I do not need any driver for the sensor. My task is to have an access to the sensor data. I have followed the ...
7
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1answer
434 views

Is it possible to list all runtime dependencies for ROS

I've read this link: http://wiki.ros.org/kinetic/Installation/Source and have known that the command ...
3
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1answer
164 views

ROS: Human to Robot Mapping (Baxter)

I'm having some difficulties understanding the concept of teleoperation in ROS so hoping someone can clear some things up. I am trying to control a Baxter robot (in simulation) using a HTC Vive ...
3
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1answer
461 views

Is ROS 2 due to replace ROS 1?

I have read ROS 2 document and they did not give many clues on the subject. Does anybody have more insight on the subject?
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1answer
297 views

CMakeLists.txt vs package.xml

I've read this link: https://answers.ros.org/question/217475/cmakeliststxt-vs-packagexml/ But still, I can't understand very clearly. When I try to compile ROS project with the command: ...
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0answers
585 views

ROS: joint_state_publisher dies when used in remote launch file

I've been trying to run robot_state_publisher and joint_state_publisher on a remote TX1 running Ubuntu 16.04 and ROS Kinetic. When running the node from a local launch file (manually ssh into the ...
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1answer
138 views

Why adding odometry data as control vectors to EKF-Monoslam algorithm fails?

I am working on EKF-MonoSlam (Davson) method for the mere input as a webcam, (it works "fine" if we calibrate and use reasonable sigmas) , and I am trying to add the odometry of some dataset (as ...

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