Thesis Abstract

Abstract
The construction of an automatic quiz buzzer system is essential for enhancing the efficiency and accuracy of quiz competitions. This project aims to develop a user-friendly and reliable system that can be used in various educational and entertainment settings. The automatic quiz buzzer system will consist of multiple buzzer units connected to a central control unit, facilitating quick responses from participants and ensuring fair play. The system will be designed to allow multiple teams or individuals to compete simultaneously in a quiz competition. Each team or individual will have a buzzer unit with a distinct identifier to enable the central control unit to track responses accurately. The buzzer units will be equipped with responsive buttons that, when pressed, trigger a signal to the central control unit, indicating the first respondent. The central control unit will be responsible for processing the signals received from the buzzer units and determining the order of responses. It will display the team or individual identifier of the first respondent on a digital display, indicating who has the right to answer the question. The system will also have provisions for locking out other buzzer units once a response has been registered, preventing multiple responses from the same team or individual. In addition to facilitating quiz competitions, the automatic quiz buzzer system will also feature customization options for quiz moderators. The system will allow moderators to set timers for questions, track scores, and adjust settings according to the requirements of the quiz format. Furthermore, the system will be designed to be portable and easy to set up, making it suitable for a wide range of quiz events. The construction of the automatic quiz buzzer system will involve programming microcontrollers, designing circuit boards, and integrating wireless communication modules for seamless connectivity between the buzzer units and the central control unit. Testing and calibration will be conducted to ensure the system's accuracy and reliability in detecting and displaying responses in real-time. Overall, the automatic quiz buzzer system will serve as a valuable tool for quiz organizers, educators, and entertainment event managers, offering a convenient and efficient solution for conducting quiz competitions. Its user-friendly interface, robust design, and customizable features make it a versatile and practical choice for enhancing the quiz experience in various settings.

Thesis Overview

1.0 INTRODUCTION

1.1 BACKGROUND OF THE STUDY

Quiz buzzers are used often at places like educational institutions where it is required for game shows and also in live quiz competitions broadcast via television. A quiz buzzer allows any user to press the switch quickly in response to a question posed during competitions that are conducted in schools and colleges. The pressed switch gives a buzzing sound or alarm for some duration of time and the reaction time is very small. Buzzer can also be used in different applications such as annunciator panels; electronic metronome microwave oven and other house hold application.

Conventional systems require human intervention to decide which team has pressed the button and this system can be erroneous and even biased. Another problem arises when two members pressed the button at a negligible interval and it is difficult to guess who has pressed the buzzer first. Here we designed an automatic quiz buzzer system such that when more than one team presses the buzzer, the delay is accurately taken into account and number is displayed. We build the circuit using a microcontroller which scans the input from push buttons and displays the corresponding number on a display device. It is a simple circuit with minimum number of components and

sans any complexities. The microcontroller takes into account the time delay between two buttons and the accurate number is displayed. Even though this system is only for 8 teams, more teams can be added by using another set of 8 push buttons.

1.2 AIM AND OBJECTIVE

The aim of this project is to designed and construction of automatic quiz buzzer system such that when more than one team presses the buzzer, the delay is accurately taken into account and number is displayed.

1.3 JUSTIFICATION OF THE STUDY

The circuit is a simple embedded system with a set of 8 push buttons being the input devices, a micro-controller as the controller and the output devices being a buzzer and a display. The whole operation is carried out by a micro-controller through a program written in C language and dumped inside the micro-controller. When one of the buttons is pressed, the buzzer starts ringing and the corresponding number is displayed on the liquId crystal display.

A quiz buzzer circuit can be implemented in several ways with the use of various controllers. These controllers include 555 timer and microcontrollers. The 555 timer based buzzer circuit is a simple and low-cost device wherein the time duration is determined by the resistor

and capacitor value (RC constant). A microcontroller based buzzer circuit is a programmable timer wherein the time duration can be varied by changing the program code of the microcontroller.

1.4 SCOPE OF THE STUDY

The whole design process involves six steps. First step requires designing the circuit; the second step is drawing the circuit on any software like Proteus. The third step involves writing the code using high level language or assembly language and then compiling it on a software platform like Kielu Vision. The fourth step is dumping the code in micro-controller and fifth step is simulating the circuit.

The circuit involves using five major components – a Microcontroller, 8 SPST push buttons, a buzzer and liquid crystal display. The microcontroller used in this case is AT89C51, an 8 bit microcontroller manufactured by Atmel.

Reset Circuit Design

The reset resistor is selected such that the voltage at the reset pin, across this resistor is at minimum of 1.2V and the width of the pulse applied to this pin is greater than 100ms. Here we select a resistor of 100K ohms and a capacitor of 10uF.