first using · Fastest Finger First Mini Project using Microcontoller ( pdf,doc,ppt) fastest, fastest finger first using 89c51 project, project on fastest. I have designed the circuit using microcontroller, which scans the First step is designing the circuit. The microcontroller used in this case is AT89C51, an 8 bit microcontroller manufactured by Atmel (now Microchip). Quiz buzzer circuit operation using microcontroller (AT89C51) and timer for The team that presses the buzzer first is given the first preference for answering a question. buzzer.

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Fastest Finger First Indicator

Polling method is used instead of fasgest-finger-first the microcontroller, by using IC — as monostable multivibrator Timer. With a slight modification, this circuit can accommodate more than four contestants.

Quiz-type game shows are increasingly becoming popular on television these days. For this reason buzzer rounds are avoided for quiz contest held in colleges. In TV shows, where the whole event is recorded, the actions are replayed in slow motion to detect the first hit. Virgin Galactic — Commercial Space Fastest-fingef-first.

IC is used in monostable mode. Computer engineering is a discipline that integrates several fields of electrical engineering and computer science required to It is build around microcontroller AT89C It works on 5V supply.


This project uses a regulated 5V, mA power supply. AT89C51 is an 8-bit microcontroller and belongs to Atmel’s family.

8 candidate quiz buzzer using 8051 microcontroller (AT89C51)

The quiz buzzer presented here takes care of the aforesaid problem. Bridge type rectifier is used. Logic 0 state at one of the outputs of IC2 produces logic 1 input condition at pin 4 of IC7, there by enabling the audio oscillator.

While every effort is made to ensure the accuracy of the information on this site, no liability is accepted for any consequences of using it. Eight pins of port P2 of the microcontroller are corresponding to eight inputs and one stop pin for resetting the buzzer system. Choosing Motor For Robots.

Priority encoder IC4 encodes usiing active-low input condition into the corresponding binary coded decimal BCD number output. The quiz buzzer systems are widely used in school, colleges and TV programs. The output is displayed on a 16×2 liquid crystal display LCD. The quiz buzzer presented here takes care of the aforesaid problem.

The person who knows the answer hits the buzzer first and then answers the question.

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As soon 89c5 any one of the inputs is pressed, the buzzer sounds for a small duration. Diodes 1N form the bridge rectifier. R and C are the timing components which decide the duration of the low going pulse. The audio alarm generator comprises clock oscillator IC7whose output drives a loudspeaker. We make no effort to place the Data bus into reverse direction.


There is also a provision for sounding a buzzer for a small duration. A buzzer is also sounded for a small duration to give an acoustic alarm.

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Thursday, August 22, The output is displayed on a seven segment display interfaced with microcontrollerwhich shows the number corresponding to the team which has pressed the button first. You have entered an incorrect email address!

Millions of engineers and scientists worldwide use MATLAB to analyze and design the systems and products transforming Once the trigger is applied, it is not effective for the time period TON, thus not having any control on the output and the output remains high 5V for T ON seconds.

Career advice and jobs related to electronics and IOT. This high to low output is an indication to the microcontroller, implying that the time period of accepting inputs is over.