8 Channel Quiz Buzzer Circuit using Microcontroller

In this project, the design and working of an 8 Channel Quiz Buzzer Circuit using Microcontroller (8051), which tells  which team has pressed the button first in a quiz or game show.  Quiz buzzers are used often at places like educational institutions and game shows, where it i

Project Title

8 Channel Quiz Buzzer Circuit using Microcontroller

Project Area of Specialization

Robotics

Project Summary

In this project, the design and working of an 8 Channel Quiz Buzzer Circuit using Microcontroller (8051), which tells  which team has pressed the button first in a quiz or game show. 

Quiz buzzers are used often at places like educational institutions and game shows, where it is required for the organizers to know who pressed the button first. 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 in this project, an Automatic Quiz Buzzer System will be designed in which, when more than one team presses the buzzer, the delay between the two button presses is accurately taken into account and the corresponding number is displayed.

Project Objectives

This is accomplished by the following steps:

1. Create a new project on Keil window and select the target (microcontroller).
2. Create a new file under the project and write the code.
3. Save the code with .c extension and add the file to the source group folder under the target folder.
4. Compile the code and create the hex file.

Project Implementation Method

The circuit using 8051 microcontroller, which scans the input from push buttons and displays the corresponding number on a display device (7-Segment Display). It is a simple circuit with minimum number of components and sans any complexities. Even though this system is designed for only for 8 teams, more teams can be added by using another set of 8 push buttons.

Benefits of the Project

1. This circuit can be used at quiz competitions organized at schools, colleges and other institutions.
2. It can be also used for other games shows.
3. It can be used as at public places like banks, restaurants as a digital token display system.

Technical Details of Final Deliverable

The circuit involves using five major components – 8051 Microcontroller, SPST Push Buttons, a buzzer and a common anode 7 segment display.  The microcontroller used in this case is AT89C51, an 8 bit microcontroller manufactured by Atmel (now Microchip).

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 100 ms.  Here we select a resistor of 10K? and a capacitor of 10?F.

Oscillator Circuit Design: The oscillator circuit is designed using a crystal oscillator of 11.0592 Mhz and two ceramic capacitors each 33pF. The crystal is connected between pins 18 and 19 of the microcontroller

Microcontroller Interfacing Design: The set of 8 push buttons are interfaced to port P1 of the microcontroller and a buzzer is interfaced to the port pin P3.3. The 7 segment display is interfaced to the microcontroller such that all the input pins are connected to port P2. 

Final Deliverable of the Project

Hardware System

Core Industry

IT

Other Industries

Media

Core Technology

Others

Other Technologies

Robotics

Sustainable Development Goals

Quality Education, Peace and Justice Strong Institutions

Required Resources

If you need this project, please contact me on contact@adikhanofficial.com