This is a tiny introduction to ROS. There are three parts to the content:
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Installing ROS on your Raspberry Pi - go here.
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A simple messaging demo with no hardware required - go here.
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Viewing the robot usdf file - go here.
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Adding movement control and a motion sensor to a robot using ROS here.
If you are having problems with this (or any other ROS installation) you can find answers to frequently asked questions here.
Have fun!
Rob Miles