"Hit the Target" Game

● Today video games are very popular among children. The circuit describe below is similar to shooting video game in this one has to hit the target given by another contestant. If he shoots the given target than 10 points will be given and in the end whose score is more will be declare as winner.

● Advantage of this circuit is it will not harm the eyes of children when they play for long duration. As instead of video screen this circuit uses LED for display.

● It can be easily assemble because of less and easily available components.

● This circuit also produces a sound when you hit the target like you get in video games. So children will get feel of real video game.

● You can easily power the circuit with the help of adapter available in market.

● There is no restriction on the number of contestant who can play the game.

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Fig. 1: Prortotype of "Hit the Traget" Circuit on Breadboard

How to play

Assemble the circuit and provide power supply. All the LED’s are randomly glowing and becoming off. You can vary the speed of LED’s for the period which it on and off with the help of variable resistor VR1. Now give the target that to the contestant playing with you like shoot LED number 5. Then he has to press the shoot button that is switch S2 in such a way that only LED5 will glow. If he presses the button and LED5 glows with a shooting sound than he has given 10 point else no point is given. Now to a start the game again press the start button S1 and again all LED’s start glowing. Repeat the same process and in the end who has the highest score will be declare as winner.

To make the game look interesting use sticker of airplane in front of LED so it will give you a look you are shooting the planes.

Working of circuit

In this circuit IC2 is wired in bistable mode means it is stable in any one state may be high or low until external pulse is applied. That’s why it is also known as flip flop and can be used to store one bit of data. When you on the circuit voltage at trigger pin 2 of IC2 is less than 2/3 of Vcc, because of this output remain high and remain in that state until voltage at threshold pin 6 of IC2 goes above 2/3 of Vcc. So when you press the switch S2 that is shoot switch this bring the output of IC2 to low and reset the IC3 and IC4.

In this circuit NE55 timer IC3 is wired as an astable oscillator. In this circuit NE555 astable generates a clock for the circuit, which provide a oscillating wave to the output pin 3 of IC4. You can vary the speed of oscillation with the help of R2. The frequency of oscillation of 555 timers can be calculated by-

f=1.44/(R1+2*(VR1)*C1)

Now this clock signals are given to pin 14 of IC4 to start its counter and when ever pin 14 goes high its counter is incremented with one like first we get output from pin 3 that is Q0 and LED1 will glow than from 2 that is Q1, LED2 will glow and so on in sequential manner. As you can see from circuit diagram pin 4 of IC3 is connected to pin 3 of IC2 so whenever shoot switch S2 is pressed it will hold that output and a single LED will glow. And when you again press the start switch S1 it will again start it is counter from 0 to 10.

Sound generation circuit is built around UM3561 IC which is connected to shoot switch S2 so whenever S2 is pressed IC1 gets power supply and provide you the gun sound. While providing the power supply to UM3561 be careful do not provide voltage more than 3.3V as excess voltage may destroy the IC. Or you can use zener diode as we used in our circuit.

You can also UM3561 to produce different sound like fire force, ambulance and police siren. Just make the changes with 1 and 6 as shown in table below to get different sounds.