Problem Statement

In tennis, consistently hitting the sweet spot of the racket is essential for power, control, and reducing the risk of injury. However, beginners and amateur players often lack real-time feedback to know whether they’ve hit the optimal zone.
Current feedback methods rely on visual observation or coach input, which are delayed, subjective, and not always accurate.
Missed hits generate excessive vibrations and noise, increasing the chances of wrist strain and reducing shot efficiency.
There is a lack of an affordable, real-time, and easy-to-use solution that helps players improve their technique by providing instant feedback on hit quality.

Idea

Develop a sensor-based attachment for a tennis racket that detects whether the player hits the sweet spot or not—using piezoelectric sensors to measure vibration patterns.
The system uses predefined vibration intensity thresholds to determine shot accuracy and provides immediate feedback via serial monitor or external display, along with optional gamified features to make training more interactive and engaging.

Objectives

• To detect sweet spot hits using piezoelectric vibration sensors in real time.

• To provide instant feedback to players on shot quality without the need for video or coaching.

• To minimize unnecessary vibrations and noise, reducing the risk of wrist strain and injury.

• To integrate gamification elements that make practice sessions more interactive and goal-driven.

• To build a low-cost, plug-and-play device that is lightweight, durable, and easy to attach.

• To encourage data-driven training for consistency, accuracy, and confidence.

 Final Solution

VIBE-SPOT is a compact, attachable device for tennis rackets that:

• Uses piezo sensors to detect vibration generated upon ball impact.

• Classifies hits as sweet spot or off-center based on vibration thresholds calibrated during testing.

• Sends instant feedback through a serial monitor, with future scope for LED indicators or mobile notifications.

• Introduces a gamified scoring element to track performance and encourage improvement.

• Is made from lightweight materials, ensuring minimal impact on racket balance.

• Is built using open-source hardware and code, enabling further customization and adaptation by players, coaches, or developers.

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