Common Projects
The possibilities for hardware projects using an Arduino are literally endless. Some great ones that have been done recently are shown below:
An omni-directional path finding robot:
https://www.youtube.com/watch?v=NRWIzq9EHKw
A robotics hand that mimics your motions:
https://www.youtube.com/watch?v=oZ7JqdwHHCc
A guitar hero player: