Digital Quiz Buzzer System Using Microcontroller

Abstract

A Digital Quiz Buzzer System with Microcontroller Control is designed to ensure fairness, speed, and accuracy in quiz competitions. Traditional systems often fail to detect the first responder correctly when multiple participants press buttons simultaneously. This system uses an Arduino Nano microcontroller to detect and lock the first input among multiple users. The system provides real-time response detection, activates a buzzer alert, and displays results on LCD screens. The developed system ensures accurate, reliable, and fast operation, improving fairness and reducing human error in quiz competitions.

Introduction

The paper presents a Digital Quiz Buzzer System based on an Arduino Nano microcontroller to ensure fair and accurate response detection during quiz competitions. Traditional buzzer systems often fail to identify the first responder when multiple participants press buttons simultaneously, leading to confusion and human error. The proposed system overcomes these limitations by detecting the first button press, locking all remaining inputs, and displaying the result on LCD screens while activating a buzzer.

The system consists of four players, each equipped with four push buttons representing answer options (A, B, C, and D). When powered on, the Arduino initializes all components and waits for the quiz master to press the reset button to begin a new round. As soon as a player presses an option, the microcontroller identifies the first response within milliseconds, disables all other inputs, records the player number and selected option, sounds the buzzer, and displays the information on both individual player LCDs and a master LCD.

The system combines hardware and software to achieve reliable operation. The Arduino Nano continuously monitors all input signals, processes them rapidly, and ensures only the earliest response is accepted. The use of I2C LCD displays reduces wiring complexity while providing clear visual feedback for both participants and the quiz master.

Testing with four players demonstrated that the system accurately detected the first response, successfully locked subsequent inputs, displayed the selected player and answer option, and reset correctly for the next question. The buzzer and LCD displays provided clear and immediate feedback throughout the quiz.

Conclusion

The Digital Quiz Buzzer System with Microcontroller Control was successfully designed and implemented to improve the efficiency and fairness of quiz competitions. The system uses the Arduino Nano as the main controller to manage inputs from multiple players and to control the display and buzzer outputs. The developed system is capable of detecting the first player who presses the buzzer and automatically blocking the other inputs. This ensures accurate and fair response selection during quiz competitions. The use of individual player displays and a master display helps both participants and the quiz master clearly view the responses and options.

References

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Copyright

Copyright © 2026 Prof. Konade S. B., Dudhabhate N. S., Dhale Y. C., Gaikwad A. B., Dulange C. C.. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.