Book Image

Mastering ROS for Robotics Programming

By : Lentin Joseph
Book Image

Mastering ROS for Robotics Programming

By: Lentin Joseph

Overview of this book

The area of robotics is gaining huge momentum among corporate people, researchers, hobbyists, and students. The major challenge in robotics is its controlling software. The Robot Operating System (ROS) is a modular software platform to develop generic robotic applications. This book discusses the advanced concepts in robotics and how to program using ROS. It starts with deep overview of the ROS framework, which will give you a clear idea of how ROS really works. During the course of the book, you will learn how to build models of complex robots, and simulate and interface the robot using the ROS MoveIt motion planning library and ROS navigation stacks. After discussing robot manipulation and navigation in robots, you will get to grips with the interfacing I/O boards, sensors, and actuators of ROS. One of the essential ingredients of robots are vision sensors, and an entire chapter is dedicated to the vision sensor, its interfacing in ROS, and its programming. You will discuss the hardware interfacing and simulation of complex robot to ROS and ROS Industrial (Package used for interfacing industrial robots). Finally, you will get to know the best practices to follow when programming using ROS.
Table of Contents (19 chapters)
Mastering ROS for Robotics Programming
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Interfacing USB webcams in ROS


We can start interfacing with an ordinary webcam or a laptop cam in ROS. There are no exact specific packages for webcam - ROS interfaces. If the camera is working in Ubuntu/Linux, it may be supported by the ROS driver too. After plugging the camera, check whether a /dev/videoX device file has been created, or check with some application such as Cheese, VLC, and such others. The guide to check whether the web cam is supported on Ubuntu is available at https://help.ubuntu.com/community/Webcam.

We can find the video devices present on the system using the following command:

$ ls /dev/ | grep video

If you get an output of video0, you can confirm a USB cam is available for use.

After ensuring the webcam support in Ubuntu, we can install a ROS webcam driver called usb_cam using the following command:

  • In ROS Jade

    $ sudo apt-get install ros-jade-usb-cam
    
  • In ROS Indigo

    $ sudo apt-get install ros-indigo-usb-cam
    

We can install the latest package of usb_cam from the source...