DIY Game: Glow All the LEDs First!

This is a 2 player game, based on 8051 microcontroller AT89S52. This game features two push buttons (one for each player) and an array of 8 LEDs for each. It demands high reflexes, as you have to push button as fast as you can. Each press would help the successive LED to glow until all the 8 LEDs are on.

The competition is about how fast you can toggle (Press and then un-press) the buttons, greater your speed of pressing push button, greater will be your chance of winning. As soon as any of the two players reach the last LED, the push button of another player will get deactivated, which means it will not respond to the push. Also the LEDs of the winner will start toggling. This will ensure the accurate after results. To restart the game, press the reset button (button connected to pin 9 on microcontroller).

Fig. 1: Prototype of 8051 Microcontroller based Fastest LED Game

Fig. 2: Image showing gameplay of Fastest LED Game

LEDs corresponding to PLAYER 1 are connected to PORT 2 whereas for PLAYER 2, LEDs are connected to PORT 3. Push buttons are connected to pin P1.1 and P1.2 for PLAYER 1 and PLAYER 2 respectively. I have used integer variables “pressed[0] and pressed[1]”(in coding part) to ensure that microcontroller counts only those push which are done after the release of the button. This will ensure fair play.

I have also declared an array arr[], which comprises the hexadecimal values for the LEDs to glow successively. I have also created a delay function: delay_msec(), using TIMERS to provide delay (in milliseconds) wherever necessary.

Since 8051’s cannot multitask, thus to judge the 2 players individually I have written the code in such a manner that it seems to perform multitasking. This was needed to count each and every perfect push and hence result in a fair decision game.

Components & Applications

REQUIREMENTS:

AT89S52 (8051 microcontroller)
16 LEDs (8 for each player)
Two good quality push button (small)
1 Crystal:- 11.0592MHz
7805 voltage regulator
One 9V DC battery

APPLICATIONS:

· This can be used as a platform for two players to make a fare decision out of their contradicting views(it’s similar to tossing up a coin and making decisions, but with an electronic touch to it).

· This can also be used a usual game for children to enjoy and practice up on their reflexes.

Project Source Code

###

#include
sbit B1=P1^1;
sbit B2=P1^2;
int arr[]={0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff};
void delay_msec(int time)
{
int i=0;
while(iwhile(TF1==0);
TR1=0;
TF1=0;
i++;
}
}
void main()
{
int i=0,j=0,pressed[2]={0,0};
B1=B2=1;
P1=0x00; P2=0x00; P3=0x00;
while(1)
{
 if(B1==0 && pressed[0]==1)
{delay_msec(20);pressed[0]=0;}
if(B2==0 && pressed[1]==1)
{delay_msec(20);pressed[1]=0;}
if(B1==1 && pressed[0]==0)
{delay_msec(20);pressed[0]=1;
P2=arr[i];i++;
if(i==8)
{ P2=0x00;
while(1)
{P2=~P2;delay_msec(150);}
}
}
if(B2==1 && pressed[1]==0)
{delay_msec(20);  
pressed[1]=1;
P3=arr[j];j++;
if(j==8)
{ P3=0x00;
while(1)
{P3=~P3;delay_msec(150);}
}
}
}}
###