Automated tennis ball ejection machine

An automatic machine has been developed to serve as an aid for tennis training. The machine can independently eject balls, and also enables automatic horizontal oscillation using a worm gear and mechanical adjustment of the vertical angle of ejection. It is controlled via a mobile application connected via Bluetooth, which offers different operating modes for the most realistic simulation of a tennis opponent. The system consists of four motors controlled via an Arduino microcontroller: two motors eject the ball using rollers, the third motor rotates the entire horizontal guidance mechanism, while the fourth motor rotates the disk that feeds the balls from the tank to the rollers. The implemented device significantly improves the quality of independent tennis training. The advantages of this innovation are better training efficiency, greater availability of training at any time, and adaptability to different levels and needs of players.