How to Program Your Robot Car into a Goalkeeper?

Programing a robot car can bring a lot of fun. In this post, we are going to discuss how to program a robot car into a goalkeeper: watching the ball, moving to the ball, kicking it, returning to the start point and waiting for the next ball, keeping itself in the field... What's more, we will walk through the system states and transition between states above these subtasks, and principles and methods below these subtasks.