David Lukas Wenzler
What is ROS
ROS = Robot Operating System
• First stable release 2009/02/10 (ROS 0.4)
History / Development of ROS
2007 2009 Community all over the
World
• Stanford University • Willow Garage • Hobbyist
• Stanford-AI-Robot- • Silicon Valley • Researcher
Projektes (STAIR)
• Menlo Park, • Industry
California
http://www.ros.org/wp-content/uploads/2018/05/melodic_with_bg.png
Why ROS?
• Unified communication framework for sensors,
actuators and computers
• Software can be reused
• Easy simulation of the robot
• Record and play back sensor data
• → Standardized framework for robot development
http://www.ros.org/wp-content/uploads/2017/05/lunar_with_bg.png
ROS-Video
How does ROS work?
PUB-SUB design pattern
• ROS uses a publish–subscribe design pattern
Topics
publishes a message to a topic (named logical channels)
Subscribes to a topic
Publishers Subscribers
(senders of messages) (receiver of messages)
→ Important: Subscriber will only receive messages of subscribed topics
→ Filtering of the messages
http://www.ros.org/wp-content/uploads/2016/05/kinetic.png
How does ROS work?
PUB-SUB design pattern
• Example of the PUP-SUB pattern
→ Important: Puplisher and Subscriber don´t know each other
http://www.code2succeed.com/pub-sub/
How does ROS work?
ROS basic architecture
• Nodes: Executables, the computation is done here
• Master: Registration and lookup service for al other nodes
• Parameter Server: Central data storage for the nodes during runtime
• Messages: Data send to other nodes
• Topic: Buses used by nodes to transmit data
• Services: Used to communicate with nodes and receive a reply
• Bags: All information of the communication is stored here
How does ROS work?
ROS basic architecture
ROS-Industrial
• Open source project
• Interfaces for common industrial devices
(manipulators, grippers, sensors, and device networks)
• Includes libraries for common industrial applications
(2D/3D sensor calibration, process path/motion planning, ...)
• Collaboration with the industries big players like Microsoft or BMW
https://rosindustrial.org/
ROS industrial - Video
Live ROS Example
A lsmall live example using a virtual machine and ROS to control a
turtle simulation of the “turtlesim” package
1. Starting of the Master node: roscore
2. Starting of the visualization tool: rqt_graph
3. Starting of the simulation node: turtlesim turtlesim_node
4. Starting of the keyboard input node to control the velocity of the
turtle: turtlesim turtle_teleop_key
Thank you for your attention
Any questions?
References
• Fernández, Enrique, et al. Learning ROS for Robotics Programming, Packt
Publishing Ltd, 2013. ProQuest Ebook Central,
https://ebookcentral.proquest.com/lib/erlangen/detail.action?docID=3564
787.
• http://wiki.ros.org/
• Quigley, Morgan, et al. "ROS: an open-source Robot Operating
System." ICRA workshop on open source software. Vol. 3. No. 3.2. 2009.
• Jason M. O'Kane. A Gentle Introduction to ROS. CreateSpace Independent
Publishing Platform, 1st edition, 2014. ISBN 978-14-92143-23-9
• http://www.willowgarage.com/pages/about-us/history
• https://rosindustrial.org/about/description
