An in-situ and real-time spin detection and training system for tennis serve and hit

The present invention relates to an in-situ and real-time spin detection and training system for tennis serve and hit. The system is installed in a racket and includes an operation module, a vibration detection module, a electronic gyro module and a speaker. The operation module is connected to the vibration detection module, the electronic gyro module, and the speaker. The vibration detection module generates a vibration signal when sensing vibrations after the racket was hit by a ball. The electronic gyro module is provided for generating an angular momentum. The operation module calculates rotation value of tennis (in RPM, revolutions per minute) according to the vibration signal and the change of angular momentum, and compares the rotation value with a default value. If the rotation value did not match the default value, the speaker generates sounds to mention the player. The system can resolve the shortcomings of the conventional training system that fails to provide in-situ and real time feedback to the