[ROS] Rear Ultrasonic Sensor using Arduino for Turtlebot Robot with ROS

[Learn ROS on Udemy https://www.udemy.com/ros-essentials/?couponCode=ROS1YT2018] This is a demo prepared by my student Bassel Said in the course CS460, Introduction to Mobile Robots, where he developed an ultrasonic sensor with Arduino and integrated it to Turtlebot robot as a rear obstacle detection sensor, which emulated rear sensors of vehicles. While the robot moves back, it will make a sound proportional to the distance to the obstacle, and finally force to stop if the distance becomes lower than a certain threshold. Great work Bassel! To learn how to build this application, learn ROS on Udemy https://www.udemy.com/ros-essentials/?couponCode=ROS1YT2018

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