Book Image

ROS Robotics By Example, Second Edition - Second Edition

By : Carol Fairchild, Lentin Joseph, Dr. Thomas L. Harman
Book Image

ROS Robotics By Example, Second Edition - Second Edition

By: Carol Fairchild, Lentin Joseph, Dr. Thomas L. Harman

Overview of this book

ROS is a robust robotics framework that works regardless of hardware architecture or hardware origin. It standardizes most layers of robotics functionality from device drivers to process control and message passing to software package management. But apart from just plain functionality, ROS is a great platform to learn about robotics itself and to simulate, as well as actually build, your first robots. This does not mean that ROS is a platform for students and other beginners; on the contrary, ROS is used all over the robotics industry to implement flying, walking and diving robots, yet implementation is always straightforward, and never dependent on the hardware itself. ROS Robotics has been the standard introduction to ROS for potential professionals and hobbyists alike since the original edition came out; the second edition adds a gradual introduction to all the goodness available with the Kinetic Kame release. By providing you with step-by-step examples including manipulator arms and flying robots, the authors introduce you to the new features. The book is intensely practical, with space given to theory only when absolutely necessary. By the end of this book, you will have hands-on experience on controlling robots with the best possible framework.
Table of Contents (18 chapters)
ROS Robotics By Example Second Edition
Credits
About the Authors
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface
Index

Flying Crazyflie


Now we are finally ready to fly our mission. Making Crazyflie fly to a target requires that the quadrotor be controllable to hover in place. Once this task is successful, the next step is to fly to a stationary target. We will introduce the steps to accomplish these tasks in the next sections.

Hovering in place

The first step to control Crazyflie's flight is the ability to demonstrate control of the quadrotor hovering in one location. To start the process, use the launch command:

$ roslaunch crazyflie_autonomous hover_kinectv2.launch

Then, turn on Crazyflie and let it run through its startup routine. When it is complete, type the following in a second terminal window:

$ roslaunch crazyflie_autonomous control_crazyflie.launch

The hover mission can be started by pushing the Takeoff (blue) button on the Xbox 360 controller. After Crazyflie has achieved takeoff, the quadrotor will begin to receive cmd_vel (geometry_msgs/Twist) messages telling it to stay in its same location with...