31-01-2013, 07:01 PM
kindly send me circuit diagram of fastest finger first project to make a project on microcontrollero
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fastest finger first using 89c51 with its ckt diagram
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kindly send me circuit diagram of fastest finger first project to make a project on microcontrollero
22-03-2014, 01:27 AM
how to get program for fastest finger first using microcontroller
07-10-2015, 06:54 PM
09-10-2015, 02:36 PM
fastest finger first using 89c51 with its ckt diagram
The quiz buzzer systems are widely used in school, colleges and TV programs. The team which presses the buzzer earliest is entitled to give the answer. 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. In such cases the decision can be biased due to human intervention. The quiz buzzer presented here takes care of the aforesaid problem. This quiz buzzer disables the other inputs as soon as the first buzzer is pressed. This quiz buzzer can be used for a maximum of eight teams. It is build around 8051 microcontroller (AT89C51).
Introduction:
Now a days quiz-type game shows are increasingly becoming popular on television. In such quiz games , fastest finger first indicators (FFFIs) are used to test the contestants reaction time. The player’s designated number is displayed with an audio alarm when the player presses his entry button.
Objective:
The fastest finger first circuit presented here determines as to which of the four contestants first pressed the button and locks out the remaining three entries of other three members. Simultaneously, an audio alarm (buzzer) and the correct decimal number display of the corresponding contestant are activated.
INTRODUCTION
Useful for quiz games,dumb charades etc.This fastest-finger-first circuit displays the player number along with beep sound when a specific player presses the button before others.It is designed for seven players and can be constructed easily using minimal hardware and software. When a microcontroller receives an input from any of seven tactile switches (S1 through S7),it disables the inputs from the rest of the switches assigned to other players.A master reset control (switch 0) has to be pressed to enable all the inputs for the next round of the quiz.
Details
CIRCUIT DESCRIPTION
A 9V DC supply from either a dry cell or a battery eliminator circuit is regulated by IC 7805.The regulated 5V DC obtained is used to power the circuit.The glowing of LED1 indicates the presence of power in the circuit.The circuit for the Fastest-Finger-First using microcontroller AT89C51.
MICROCONTROLLER AT89C51
At the heart of the circuit is flash-based microcontroller IC AT89C51.It is a low-power ,high performance CMOS 8-bit microcomputer with 4KB of flash programmable and erasable read-only memory(PEROM).It is manufactured using Atmel's high-density,non-volatile memory technology and is compatible with the industry-standard MCS-51 instruction set.The on-chip flash allows the program memory to be reprogrammed in-system or by a conventional non-volatile memory programmer. Combining a versatile 8-bit CPU with flash on a monolithic chip,the Atmel AT89C51 is a powerful microcontrollerthat provides a highly flexible and cost-effective solution to many embedded control applications. The AT89C51 provides the following standard features:
4KB flash
2. 128 bytes of RAM 3. 32 I/O lines 4. Two 16-bit timers/counters 5. A 5-vector,two-level interrupt architecture 6. A full duplex serial port 7. On-chip oscillator and clock circuitry.
Here port0 and port1 are used as input and output ports respectively.
Port-0
ort-0 is an 8-bit open-drain bidirectional I/O PORT.AS an output port,each pin can sink eight TTL inputs.When 1's are written to port-0 pins,the pins can be used as high-impedence inputs.Port-0 may also be configured to be the multiplexed low order address/data bus during access to the external program and data memory.Port-0 receives the code bytes during flash programming and outputs them during program verification.External pull-ups are required during program verification.In this application,each pin of port-0(P0.0 through p0.7)is pulled low through the 1 Killo-ohm resistor network. Port-1ort-1 is an 8-bidirectional I/O port with internal pull-ups.The port-1 output buffers can sink/source four TTL inputs.When 1's are written to port-1 pins,they are pulled high by the internal pull-ups and can be used as inputs.As inputs,port-1 pinsthat are externally being pulled low will source current because of the internal pull-ups.In this application,port pins p1.0 through p1.6 are directly connected to 7-segment common-anode display LT542.The microcontroller increases the accuracy of the results,controls the input actions and directly drives the display.Achieving similar perfomance in the same space is not feasible by employing ordinary ICs.
The quiz buzzer systems are widely used in school, colleges and TV programs. The team which presses the buzzer earliest is entitled to give the answer. 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. In such cases the decision can be biased due to human intervention. The quiz buzzer presented here takes care of the aforesaid problem. This quiz buzzer disables the other inputs as soon as the first buzzer is pressed. This quiz buzzer can be used for a maximum of eight teams. It is build around 8051 microcontroller (AT89C51).
Introduction:
Now a days quiz-type game shows are increasingly becoming popular on television. In such quiz games , fastest finger first indicators (FFFIs) are used to test the contestants reaction time. The player’s designated number is displayed with an audio alarm when the player presses his entry button.
Objective:
The fastest finger first circuit presented here determines as to which of the four contestants first pressed the button and locks out the remaining three entries of other three members. Simultaneously, an audio alarm (buzzer) and the correct decimal number display of the corresponding contestant are activated.
INTRODUCTION
Useful for quiz games,dumb charades etc.This fastest-finger-first circuit displays the player number along with beep sound when a specific player presses the button before others.It is designed for seven players and can be constructed easily using minimal hardware and software. When a microcontroller receives an input from any of seven tactile switches (S1 through S7),it disables the inputs from the rest of the switches assigned to other players.A master reset control (switch 0) has to be pressed to enable all the inputs for the next round of the quiz.
Details
CIRCUIT DESCRIPTION
A 9V DC supply from either a dry cell or a battery eliminator circuit is regulated by IC 7805.The regulated 5V DC obtained is used to power the circuit.The glowing of LED1 indicates the presence of power in the circuit.The circuit for the Fastest-Finger-First using microcontroller AT89C51.
MICROCONTROLLER AT89C51
At the heart of the circuit is flash-based microcontroller IC AT89C51.It is a low-power ,high performance CMOS 8-bit microcomputer with 4KB of flash programmable and erasable read-only memory(PEROM).It is manufactured using Atmel's high-density,non-volatile memory technology and is compatible with the industry-standard MCS-51 instruction set.The on-chip flash allows the program memory to be reprogrammed in-system or by a conventional non-volatile memory programmer. Combining a versatile 8-bit CPU with flash on a monolithic chip,the Atmel AT89C51 is a powerful microcontrollerthat provides a highly flexible and cost-effective solution to many embedded control applications. The AT89C51 provides the following standard features:
4KB flash
2. 128 bytes of RAM 3. 32 I/O lines 4. Two 16-bit timers/counters 5. A 5-vector,two-level interrupt architecture 6. A full duplex serial port 7. On-chip oscillator and clock circuitry.
Here port0 and port1 are used as input and output ports respectively.
Port-0
ort-0 is an 8-bit open-drain bidirectional I/O PORT.AS an output port,each pin can sink eight TTL inputs.When 1's are written to port-0 pins,the pins can be used as high-impedence inputs.Port-0 may also be configured to be the multiplexed low order address/data bus during access to the external program and data memory.Port-0 receives the code bytes during flash programming and outputs them during program verification.External pull-ups are required during program verification.In this application,each pin of port-0(P0.0 through p0.7)is pulled low through the 1 Killo-ohm resistor network. Port-1ort-1 is an 8-bidirectional I/O port with internal pull-ups.The port-1 output buffers can sink/source four TTL inputs.When 1's are written to port-1 pins,they are pulled high by the internal pull-ups and can be used as inputs.As inputs,port-1 pinsthat are externally being pulled low will source current because of the internal pull-ups.In this application,port pins p1.0 through p1.6 are directly connected to 7-segment common-anode display LT542.The microcontroller increases the accuracy of the results,controls the input actions and directly drives the display.Achieving similar perfomance in the same space is not feasible by employing ordinary ICs.
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