PDF] Design And Fabrication Of Portable Shuttlecock And Tennis Ball Shooting (Training) Machine | Semantic Scholar
Pingo, the motion-detecting ping pong ball launcher | Arduino Blog
Arduino Ping Pong Ball Cannon - Hackster.io
Tennis ball machine - Make:
Future Internet | Free Full-Text | Development of a Vision-Based Unmanned Ground Vehicle for Mapping and Tennis Ball Collection: A Fuzzy Logic Approach