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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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Using py_trees for real robot

is anybody using py_trees for a real robot or with gazebo simulation ? I'm interested in some real ROS project experience. Does py_trees perform or is it to slow for robot control.
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Best practice for robot control in gazebo-ros project

I would like to design some control algorithm for a mobile robot in ROS and simulate it with Gazebo. The goal is to develop such structure of the project to be able to switch the control mechanism ...
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ROS - Use Ubuntu Xenial Packages on Raspbian

I've got a Turtlebot3 and installed Raspbian Stretch on the Raspbery Pi, which is on the robot. For that I used the preconfigured image and the tutorial from Robotis. I followed the tutorial and got ...
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Unable to sample any valid states for goal tree

My Robotic arm is not moving when I give the x and y and z values to form a pose goal, What to do? I get the following errors. [Error] Unable to sample any valid states for goal tree I use python ...
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Moveit motion planning tutorial failing for Baxter robot

I am trying to use Moveit to perform motion planning on Baxter left arm. I ran the motion planning pipeline tutorial code for left Baxter arm(7 DOF) after making some appropriate changes. This is the ...
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2answers
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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 ...
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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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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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51 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 ...
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rosbag record -a - not collecting bag file

I am trying to capture the bag files for all the ROS topics using rosbag record -a. And when I terminate the record using Ctrl+C, the bag file captured is showing ...
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1answer
55 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, ...
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1answer
48 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
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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 ...
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1answer
88 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 ...
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2answers
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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
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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 ...
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2answers
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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 ...
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1answer
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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 ...
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1answer
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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 ...
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Invoking “make cmake_check_build_system” failed

I am getting an error while building ROS workspace using catkin_make. I am not sure but it seems to be related with anaconda. Here are the details:- ...
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Is ROS 2 due to replace ROS 1?

I have read ROS 2 docs and they did not give much clue on the subject. Anybody has more insight on the subject?
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1answer
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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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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
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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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1answer
28 views

publishing on rostopics

I want to publish via terminal a particular message format - sensor_msgs/Joy. However, every format I use seems to be wrong and I cannot understand how it is meant to be written on the terminal. On ...
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1answer
61 views

Are both of C++ and Python necessary in ROS

I'm a newbie on ROS and I'm trying to figure out how ROS works so I'm installing ROS from source. I've found that most of ROS packages contains two kinds of codes: C++ and Python. For example, here ...
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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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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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Reliable IMUs for ROS

I'm having problems in finding reliable IMU's in ROS. So far, I have tried the UM7 and the myAHRS+ with no luck. The first one, keeps resetting its magnetic reference and the second one works well but ...
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1answer
31 views

Turtlebot3 Burger - XBOX360 Controller

I am using ROS on the Turtlebot3 and try to teleop the robot with an XBOX 360 controller without success. I'm already able to teleop the robot via keyboard. Setup: Ubuntu 16.04 ROS Kinetic What I'...
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1answer
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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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remote 3d slam with limited sensing and bandwidth

I'm trying to implement a 3d visualization for a remotely operated robot, which will be equipped with either stereo grayscale cameras or one grayscale camera and a line striping system that can ...
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2answers
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Ackermann Motion Model Does not Drive in an Arc, but Turns on the Spot

Im trying to implement an ackermann motion model which estimates the x,y and theta for a robot I have. I have a gazebo simulation running which publishes a steering angle for the virtual tricycle ...
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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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Ontology/marketplace of robotics components and integration environment (BPEL or CAD for robotics)?

It should be possible to take the formal description of robotics components (in form of ontology, formal API descriptions or other kind of formal specification of the capabilities and requirements of ...
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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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1answer
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Better way to use info. received from ROS subscriber nodes

I want to use information together received from the different ROS subscriber nodes. One way I think of is to make separate callback functions for each subscriber node and then receive messages from ...
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1answer
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How can I access the cliff sensors on an iRobot Create 2 via ROS/ Python?

I have an iRobot Create 2 and am currently using the create_autonomy package. Currently, they have cliff sensors as a "planned" feature. I see in the documentation that there are 4 cliff sensors (...
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2answers
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RViz: How to Visualize a Voxblox Mesh as a MarkerArray?

I am currently trying to run the test cow and lady dataset with Voxblox. The process appears to execute properly in the terminal, but I cannot view the mesh in RViz. When I try to add the topic <...
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1answer
55 views

Turtlebot 2 dimensions

I am trying to drive the differential drive kinematics of Turtlebot 2. However, I couldn't find the distance between 2 wheels on the datasheet. I'd appreciate if anyone could provide me this dimension....
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1answer
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how to write a uav teleop code?

I'm currently working on a teleoperation code for crazyflie. I'm not using a joystick, but I'm using leapmotion and I'm trying to understand how they code for a joystick in order to implement the same ...
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1answer
41 views

SE3 composition operator gives unexpected results

Given Data and Algorithm I have a stream of SE3 poses supplied by a basic wheel encoder odometry through ROS message passing system. Odometry publishes data in traditional to ROS ENU coordinate frame ...
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1answer
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Main not defined package python issue

My apologies but I've run out of ideas. I'm very new to python and stuck trying to execute the following code from this tutorial: ...
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0answers
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MATLAB ROS Communication Issue: The following nodes should be connected but aren't

I have both MATLAB and ROS installed on a SINGLE Linux machine. I am trying to publish data from MATLAB over a rostopic and echoing it in the terminal to view it. No matter, however, I play with URIs ...
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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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warning: target request linking to directory

Im trying to build rtt package of orocos-toolvhain by using cmake .. command inside build folder. when i do so i'm getting below warning. ...
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0answers
33 views

install orocos-toolchain in xenomai pathced linux?

Can anyone tell me the proper way or give me link to install orocos-toolchain on xenomai patche linux? I have patched xenmai with linux kernel in my system and anslo when i enter "xeno lateny" i an ...
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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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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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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 ...