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Questions tagged [ros]

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

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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
98 views

Wait simulation time in a non realtime ROS simulation en 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....
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1answer
57 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 ...
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1answer
331 views

How to implement RANSAC and kalman filter or particle filter algorithms with ROS packages?

I'd like to implement those algorithms by using ROS packages to solve one way the SLAM problem. I know that gmapping, Rviz, slam_gmapping and robot_pose_ekf (for extended kalman filter) could be ...
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1answer
157 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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1answer
169 views

rospack Error: package 'script' not found

I am trying to run rosrun script forward.py but it gives me an error saying [rospack] Error: package 'script' not found In my ...
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1answer
274 views

Transform timestamped messages recorded in a bag file using tf messages

Note: this question was also asked in the ROS official Q&A website, but even after one week nobody has given me an answer. I have a .bag which contains ...
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1answer
35 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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1answer
20 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 ...
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1answer
24 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 Catking, to be automatically set ...
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1answer
92 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 ...
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1answer
74 views

Add image onto box in URDF file

I'm trying to display an image on top of a box in a .urdf file. How could I achieve this?
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608 views

ROS MoveIt!, virtual joints, planar joints, prismatic joints

I do have a robotic application, where a 7Dof robot arm is mounted on a omnidirectional mobile platform. My overall goal is to get MoveIt! to calculate a sequence of joint movements, such that the ...
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14 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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0answers
46 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 ...
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605 views

ROS Gazebo Odometry Issue

I am setting up a Gazebo model for use with the navigation stack. I have been reading the Navigation Tuning Guide and am confused about the lidar data in the odom frame. I would think that the tuning ...
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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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32 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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34 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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129 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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56 views

Orientation problem between Gripper and Object ??

I am working on a pick and place project using ROS & MoveIt!, I wrote my own pick and place functions which generate grasp poses according to the pose of the object and then automatically picks. (...
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0answers
21 views

DSO_ROS is not giving right coordinates after taking turn (left/right)

Hi all , i got stuck in a problem and really need your help. Goal: I want to move little Toy vehicle autonomously (localization and mapping) and want to get distance covered by vehicle using DSO in ...
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0answers
47 views

ROS: TurtleBot3 motors runs 60 seconds after message is seen in topic /cmd_vel

I am running ROS Kinetic, on a Turtlebot3 Burger with a Raspberry Pi3. The goal here is to remotely control the Turtlebot from another Raspberry Pi. The remote controller Pi sends movement ...
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108 views

Which Kinect to use for robotic arm pick and place application with object detection?

I am building a robotic arm for pick and place application. The robot is going to recognize several objects using the RGB feed from Kinect (will use a model such as YOLOv2 for object detection, ...
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105 views

Kalman filter for slow ground vehicle with RTK

I have been using dual RTK receivers for my tractor projects. This gives me reliable position, heading, and tilt at low rates (10 Hz). I recently began working with an INS (an Advanced Navigation ...
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0answers
76 views

PixHawk I/II not working in 'Rover' mode (firmware issue?)… HELP!

We are working in a new agricultural rover, and we opted for PixHaw-II+ROS+MavLink platform as a good control alternative. However, our project is stuck as the PixHawk seems to work only when it is ...
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68 views

rtt-exercise building error-orocos-toolchain

I am using ros kinetic in ubuntu 16.04. My first error is: ...
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138 views

Getting started with motion planning

I have recently finished the coursera Motion Planning course and I am looking for a project to do, using ROS, OpenRave, Gazebo and similar tools. My project would be in the area of motion planning for ...
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124 views

Controls Project, Inverted Pendulum. Design issues

I am developing an inverted pendulum that uses a differential drive robot as base. The goal is to create a benchmark to practice my control using ROS, so I can implement what I learn on the Modern ...
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536 views

Controlling Pepper using ROS

I am trying to implement FastSLAM 1.0 and I am using sensory and control data acquired from Pepper via ROS to evaluate my implementation. However I am having major issues when I try and control Pepper'...
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0answers
1k views

Advise on ROS move_base costmap footprint not connected error

I'm using ROS indigo in my project and all the nodes and visualisation (Rviz) seems to be functional when I launch the program using roslaunch. Here are the sensors used in the scooter: Hokuyo Lidar ...
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0answers
766 views

ROS/Gazebo: URDF Error: No valid hardware interface element found in joint

I am fairly new to ROS and Gazebo. I have posted this question on the ROS/Gazebo forums, but they appear to be dead. I am using ros-kinetic and gazebo7.3 on Ubuntu 16.04. I have been following this ...
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0answers
128 views

Waiting for the r_gripper_sensor_controller/gripper_action action server to come up

I started to use ROS hydro (Robot Operating System) and roscpp. I tested some examples to move the gripper of pr2 in Gazebo (especially the code in : http://wiki.ros.org/pr2_gripper_sensor_action/...
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580 views

Gazebo laser plug-in fails to publish scan results

I have added hokuyo laser plug-in to mu urdf file. I successfully launched the robot in gazebo and done required changes to visualize it in rviz. I didn't get any error but the laser scan results are ...
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0answers
570 views

Acceleration formula for a differential steering robot

I have the formulas to derive the RPM's of each wheel from the robot's linear velocity. Now, I am trying to do the same thing for the acceleration (mainly angular acceleration). For linear ...
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0answers
228 views

running UWSim commands in ROS

Where can I find a good documentation about the UWSim in ROS. Actually having the source files is not enough and it is actually hard to follow all the functions. for example, how can I use these ...
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19 views

Robot control project

So currently I have an unused robot car, my plan here is to be able to control the robot car with a joystick using ros_control. I am really new to ROS and is hoping you guys can guide me along. I ...
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0answers
11 views

Roboclaw node on ROS error: “Encoders None None”. Encoders can't be read properly. What might the cause be?

My two wheels robot was working properly with ROS Roboclaw node before changing a burnt Motor. After changing this motor with a similar motor, I reconfigured it as usual without touching the node or ...
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0answers
11 views

Robot fails to move in Webots environment

I am trying to teleoperate a robot which is a forklift. The details of the robot are as follows: Weight 700KG 1 actively steered caster wheel and 2 passively steered rear wheels 2 passive standard ...
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33 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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33 views

Looking for a model in a gazebo

I have a small world file, say ...
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0answers
37 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
8 views

How to translate individual rotor trust to Wrench object in ROS (force&torque)

I am learning about ros and dronesim Basically following this. There is a wrench object where I can create with force and torque vectors. My question is how can I translate individual rotor trust to ...
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17 views

Sending RTCM corrections from u-center NTRIP Server (Windows) to ROS NTRIP client (Linux)

I'm trying to set up an RTK GPS (NEO-M8P) but I need to send corrections using NTRIP. For my initial tests, I installed the u-center application on a Windows computer as my base station and then I ...
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0answers
20 views

message_filters doesn't call the callback function

I'm trying to use the message_filters in order to subscribe to two topics. Here's my code ...
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0answers
20 views

accessing serial and ethercat devices

I want to, ask is accessing all the serial devices/sensors eg. RS-422, RS-232 done in same way? And also is accessing all the devices in market with ethercat connection can be done in same way? For ...
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0answers
11 views

list of robotics framework running over xenomai

Can anyone tell me the list of robotics framework or softwares which can run on xenomai patched kernal like orocos? I was learning orocos this days in normal gnulinux kernal, but after i patch xenomai ...
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0answers
102 views

Required library XENOMAI NOT FOUND

I am following this tutorial to install orocos in my system with ubuntu 16.06, xenomai 3.0.5. But i'm getting error: ...
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0answers
733 views

Ros, iai_kinect2 issues

here is what I did on Ubuntu 14.04 LTS running on a Toshiba Satellite, intel i7, nvidia with usb 3.0 and 2.0 ports. 1, 2, 3 refer to scripts found here Setup ros by running this install-ros.sh ...
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0answers
301 views

Defining a trajectory for a quadrotor

I' m looking for a trajectory generator (the algorithm doesn't matter, since I m going to write it using C++ ) that generates a trajectory (a parametric curve in space) defined point by point which is ...