Introduction

Today our robots are going to have a volleyball lesson. 

Do you know how to play volleyball? Have you ever tried?
Volleyball is a popular Olympic sport in which two teams of six players are separated by a net. Each team tries to score points by grounding a ball on the other team's court or the team touch the ball more than 3 times.

How are we going to play volleyball with LEGO robots?
Today our robots will play volleyball. Each robot will be equipped with a basket with which they will “catch” the ball and a cannon with which they will shoot the ball. Anyone who has played volleyball will tell you that players should first warm up by passing the ball. That is what we are going to do. Our robots will start from the opposite corners of the field and will move in parallel towards each other along the edges. Once they detect each other thanks to the ultrasonic sensors, they will shoot a ball and, hopefully, catch the ball shot by the other robot :)