application of fastest finger first to mention in the report and for knowledge

applications of fastest finger first indicator

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.

This is a good ECE project report on Fastest Finger First (FFF)Indicator and was submitted in partial fulfillment for the award of degree B.Tech in Electronics and Communication Engineering. The project covers the circuit diagram of Fastest Finger First Indicator, Component used list, IC's Used in FFF- Indicator, its application, advantage etc. Fastest finger first indicators (FFFIs) are used to test the player's reaction time. You can also Subscribe to FINAL YEAR PROJECT'S by Email for more such Projects and Seminar.

The above image shows the circuit diagram of Fastest Finger First Indicator which is used to make the project and has been taken from EFY. This project is an electronic quiz buzzer that is affordable by the colleges and even individuals. This project is useful for a 4-team quiz contest, although it can be modified for more number of teams. Use this report for your reference and study only and thanks to all authors.

Components Used:

1) Integrated circuits:

IC 7805 ….voltage regulator

IC 74LS75 …. 4 bit bistable latch

IC 74LS20 …. Dual 4 input NAND gate

IC 74LS147 …. 9 lines to 4 lines priority encoder

IC 74LS04 …. HEX inverter

IC 74LS47 …. BCD to seven segment decoder

IC NE555 …. Timer

2) Resistors: 1KΩ, 330Ω, 100KΩ, 10Ω, 10KΩ

3) Ceramic Capacitors: 0.033uF, 0.01uF, 0.047uF

Electrolytic Capacitors: 47uF (35V)

4) Miscellaneous: Common anode seven segment LED display

S1-S5: Push button (Switches), Speaker (8Ω, 1W)

Working:

When a contestant presses his switch, the corresponding output of latch IC2 (7475) changes its logic state from 1 to 0. The combinational circuitry comprising dual 4-input NAND gates of IC3 (7420) locks out subsequent entries by producing
the appropriate latch-disable signal. Priority encoder IC4 (74147) encodes the active-low input condition into the
corresponding binary coded decimal (BCD) number output. The outputs of IC4 after inversion by inverter gates inside hex inverter 74LS04 (IC5) are coupled to BCDto-7-segment decoder/display driver IC6 (7447). The output of IC6 drives common anode 7-segment LED display (DIS.1, FND507 or LT542). The audio alarm generator comprises clock oscillator IC7 (555), whose output drives a loudspeaker.

The oscillator frequency can be varied with the help of preset VR1. Logic 0 state at one of the outputs of IC2 produces logic 1 input condition at pin 4 of IC7, thereby enabling the audio
oscillator. IC7 needs +12V DC supply for sufficient alarm level. The remaining circuit operates on regulated +5V DC supply,
which is obtained using IC1 (7805). Once the organizer identifies the contestant who pressed the switch first, he disables the audio alarm and at the same time forces the digital display to ‘0’ by pressing reset push button S5. With a slight modification, this circuit can accommodate more than four contestants.

Conclusion:

This project is an electronic quiz buzzer. Fastest finger first indicators are used to test the player’s reaction time. The player’s designated number is displayed with an audio alarm when the player presses his entry button. In the buzzer round of quiz contest, the question is thrown to all the teams. The person who knows the answer hits the buzzer first and then answers the question. Some times two or more players hit the buzzer almost simultaneously and it is very difficult to detect which of the team has pressed the buzzer first. In television shows, where the whole event is recorded, the actions are replayed in slow motion to detect the first hit. Such slow motions are possible only where huge funds are available to conduct the show. For this reason buzzer rounds are avoided for quiz contests held in colleges.But this indicator reduces the probability of any error in detecting who pressed the buzzer first. Thus, in this project we have concluded all the components for the set up of this indicator.

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