Oct 11, 8 CANDIDATE QUIZ BUZZER USING MICROCONTROLLER The AT89C51 microcontroller is a 40 pin package in which 32 pins can be. Apr 15, Here is the simple circuit diagram of 8 player quiz buzzer using at89c51 microcontroller. It is a simple circuit with minimum number of. Apr 3, Here is a simple 8 channel quiz buzzer circuit using microcontroller designed using AT89C51 Microcontroller. It can be used in schools.

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The microcontroller works a clock frequency of 12 Mhz. Additionally, the seventh segment bisects the rectangle horizontally.

We use 8 switches and they are connected individually to port1 pins and we make a serial line for all the 8 switches so that they can be connected to a buzzer microdontroller when any switch is presses a buzzer is blown. A bridge rectifier providesfull-wave rectificationfrom a two-wire AC input, resulting in lower cost and weight as compared to a rectifier with a 3-wire input from atransformerwith acenter-tappedsecondary winding.

Candidae is accomplished by the following Documents. What is Web Browser. In such cases the decision can be biased due to human intervention. As ay89c51, Port 2 pins that are externally being pulled low will source current IIL because of the internal pull-ups.

The 78xx family is commonly used in electronic circuits requiring a regulated power supply due to their ease-of-use and low cost. In this paper we will see how the circuit design is made and how the buzzer works and displays the information on the screen.

8 Candidate Quiz Buzzer Using At89c51 Microcontroller

Interface GPS with Arduino. When the system starts, the seven segment does not displays any output. Door knock vibration alarm works based on the principle of the piezo vibration sensor. A small current at the base terminal that is, flowing between the base and the emitter can control or switch a much larger current between the collector and emitter terminals.

This article gives a list of EEE projects for electrical engineering students, which includes solar, core electrical, home automation, irrigation, etc.


The main advantage of this bridge circuit is that it does not require a special centre tapped transformer, thereby reducing its size and cost. At times it becomes very difficult to identify which team has pressed the button when two teams press the buzzer within a very small time gap.

The most commonly used types of usint in real time applications like temperature sensors, IR buxzer and UV sensors etc with circuit diagrams. Oscillator CharacteristicsXTAL1 and XTAL2 are the input and output, respectively, of an inverting amplifier which can be configured for use as an on-chip oscillator, as shown in Figure 1. This article gives an overview of PN junction diode, Pn junction diode in zero bias, forward and reverse bias and VI characteristics of PN junction diodes.

Difference between Sensor and Transducer with Applications. When the values corresponding to the digits 0 to 9 are given on the output port, the digit gets displayed on the seven segment. We use a seven segment display to display the information of the switch which is presses.

Canridate to check whether the program you have written microcntroller errorless or not, click on the icon exactly below the Open file icon which is nothing but Build Target Icon.

Now even if any other input pin is pressed, there will be no effect on the system till the time the stop pin is pressed to reset the system.

8 Candidate Quiz Buzzer Using At89c51 Microcontroller

Just drag this icon onto the desktop so that it becomes easy whenever you try to write programs in keil. Piezo buzzer is based on the inverse principle of piezo electricity discovered in by Jacques and Pierre Curie.

SPI Module of Arduino. A buzzer is also sounded for a small duration to give an acoustic alarm. Usijg covert ac electricity from one voltage level to another with buzxer loss of power. Sign up to comment.


The quiz buzzer presented here takes care of the aforesaid problem. You can decide to make it visible only to you or to a restricted audience. Eight pins of port P1 of the microcontroller are corresponding to eight inputs and one stop pin for resetting the buzzer system.


As soon as any one of the inputs is pressed, the buzzer sounds for a small duration. There is a related line of79xxdevices which are complementary negative voltage regulators. PWM generation using microcontroller Documents.

Microcontroller based quiz buzzer project with circuit and C code.

Learn how to connect your accounts. The various electronic circuit symbols involve wires, power supplies, resistors, capacitors, diodes, transistors, meters, switches, sensors, logic gates. Leave a Reply Cancel reply Your email address will not be published. Atmel Microcontroller Programmer Circuit Microcontroller Lab Manual Vtu using Microcontroller.

Your email address will not be published. A transistor can control its output in proportion to the input signal; that is, it can act as anamplifier. A buzzer is also sounded for a small duration to give an acoustic alarm. In such cases the decision can be biased due to human intervention. A transformer most commonly consists of two windings of wire that are wound around a common core to provide tight electromagneticcoupling between the windings.

This quiz buzzer disables the other inputs as soon as the first buzzer is pressed. Any one component of the system held by an individual player is often referred to as a “buzzer” as well. Port 1 also receives the low-order address bytes during Flash programming and program verification.

University during the year Prof. Jonathan Muncie ‘s curator insight, December 4, 5: This quiz buzzer can be used for a maximum of eight teams. As inputs, Port 3 pins that are externally being pulled low caneidate source current IIL because of the pull-ups. Anonymous 24 September at How to curate as a team?

Since the seven segment display works on negative logic, we will have to provide logic 0 to the corresponding to make a LED glow.