Autonomous obstacle avoidance arduino robot is designed in Solidworks. All STL files are available on Thingiverse and can be printed on any 3D printer. Inexpensive parts can be found on eBay and total cost is less than $25. There are three lessons that can be found on YouTube.
Great project that I teach in my high school Robotics class.
Post any questions on YouTube or directly to firstname.lastname@example.org