Automatic Trebuchet

**This is a course project for VM250 - Design and Manufacturing** (It's a sophomore course in Shanghai Jiao Tong University - University of Michigan Joint Institute) This ia an Arduino based trebuchet which contains a shooting device using spring and a reloading device using step motor. The reloading system is designed for common Ping Pong balls, baseballs and tennis balls. Some components in my cars are from others' work on GrabCad websites, including the step motor and the coupler. Special thanks for your sharing and great Solidwork work! Without which I could not be able to sketch this project. This model is not perfect, I have some issues in assembling the springs. It seems like the length of the spring is always fixed in Solidwork. If you have any question or suggestion, please contact me through my E-mail: [email protected]