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System Architecture
Filters Map generation Computer vision Localization Path planning Steering Drive
System Architecture Steering Filters Localization Map generation - - PowerPoint PPT Presentation
System Architecture Steering Filters Localization Map generation - - PowerPoint PPT Presentation
System Architecture Steering Filters Localization Map generation Path planning Computer vision Drive Perception Planning Control ROS: Robot Operating System ROS distributions This course 2012 2013 2014 2015 ROS Capabilities
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ROS distributions
2014 2015 2013 2012
This course
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Perception Control Planning
ROS Capabilities
urg_node hokuyo_node zed_camera stereo_image_proc ros_zed_cuda_driver razor_imu_9dof camera1394 move_base hector_slam vanishing_point rosserial_python PID_control
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ROS Tools
Visualization, debugging and diagnostics, logging, and simulation
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ROS: Nodes
Node: Program with a specific functionality, that runs as a single process. Nodes communicate with other nodes using topics and messages
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ROS: Topics
Topics are channels over which nodes exchange messages. They are for streaming data
hokuyo_node
Scan [Topic]
Publishes on topic: Scan
Mapping Node
Subscribes to topic: Scan Publisher Node Subscriber Node
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ROS: Messages
Messages are the strongly-typed data structure for a topic.
hokuyo_node
Scan [Topic] Mapping Node
Publisher Node Subscriber Node
LaserScan [Message]
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ROS: Packages
Software in ROS is organized into packages. A package contains one or more nodes. Executable processes Data types Interfaces
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ROS: Packages
Packages contain several required files: Ø package.xml Ø CMakeLists.txt
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package.xml
Name, description, author, license...
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package.xml
Dependencies: Ø <build_depend> : Needed to compile the package. Ø <run_depend> : Needed to run the package
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CMakeLists.txt
Rules for compiling and building the software.
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Basic ROS commands: roscore
roscore is the first thing that you should run when starting ROS. Collection of nodes and programs that are pre-requisites of a ROS-based system. It starts up:
- The ROS Master
- A rosout logging node.
$ roscore
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Basic ROS commands: rosrun
rosrun executes a ROS node. Example $ rosrun <package_name> <node_name> $ rosrun hokuyo_node hokuyo_node
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Basic ROS commands: rosnode
Command Description
rosnode list
List all active nodes
rosnode info node_name
Display information about a node
rosnode kill node_name
Kill running node
Rosnode ping node_name
Test connectivity to an active node
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Basic ROS commands: rostopic
Command Description
rostopic list List all topics currently subscribed to and/or publishing rostopic info <topic> Show topic message type, subscribers, publishers etc. rostopic echo <topic> Echo messages published to the topic on the terminal window rostopic find <message_type> Find topics of the given message type
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3D visualization tool: rviz
$ rosrun rviz rviz
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rqt_graph
Perception Planning Control
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