Digital dice using 8051 microcontroller (AT89C51)

All of us have played the game of gambling and are well aware of the working of the dice. Here we are presenting a circuit to make a electronic digital dice with the help of a seven segment controlled by an 8051 microcontroller. We have already gone through the seven segment circuit interfacing (refer ‘interfacing seven segment’ section). The circuit can be divided into two units: the microcontroller unit and the seven segment unit. The microcontroller unit contains a microcontroller circuit (for microcontroller circuit details, refer ‘led blinking’ section) and the seven segment unit contains a seven segment circuit which is interfaced to the controller (for more details of seven segment circuit, refer ‘seven segment interfacing’ section). This circuit displays the numbers from 1 to 6 continuously and it halts at the position user wants and starts again from the same position with the next instruction of the user.

We are going to implement the same circuit (of seven segment interfacing) with the exception that we are going to use four extra pins of the microcontroller as input pins for stopping a dice at one position (pause), starting it again from the same position (start) and starting it from the beginning (reset) enabling the seven segment(enable). The three pins i.e. P3^3 , P1^1and P3^2 of the microcontrollers are made the input pins and assigned to variable reset, start and pause respectively. The pin P1^0 is made output and assigned to variable ‘enable’. Whenever, there is a high given from the Vcc on the pause pin, the seven segment displays the number and keep showing that number. As soon as you give high on the reset pin, the seven segment starts displaying the numbers from the beginning i.e. it starts again from displaying numbers from one (1). As soon as you give high on the start pin, the seven segment begins displaying the numbers starting from the next number at it was paused. The seven segment displays the data assigned to only and only when there is a high on its enable pin

Project Source Code

 
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// Program to make a digital dice

#include<reg51.h>

sbit reset=P3^3;
sbit start=P1^1;
sbit pause=P3^2;
sbit enable=P1^0;
int current=0;
char num[]={0xF9,0x24,0x30,0x19,0x12,0x02};        // Hex values corresponding to1to6

void delay(int time)        // Function to generate time delay
{
    int i,j;
    for(i=0;i<time;i++)
    for(j=0;j<1275;j++);
}

void pausefn()interrupt 0        //Pause function using external interrupt 0
{
    IE=0x84;
    P2=num[current];
    while(1)
    {
        if( start==0 )
        break;

        if(reset==0)
        {
            enable=1;
            current=0;
            P2=num[current];
            while(start==1);
            return;
        }

    enable=1;
    delay(25);

        if( start==0)
        break;

        if(reset==0)
        {
            enable=1;
            current=0;
            P2=num[current];
            while(start==1);
            return;
        }

    enable=0;
    delay(25);
    }
    enable=1;
}

void resetfn()interrupt 2        // Reset function using timer interrupt 2
{
    current=0;
    P2=num[current];
    while(start==1);
      enable=1;
}

void main()
{
    enable=1;
    while(1)
    {
        IE=0x85;
        if(current >5)
        {
            current=0;
        }
    P2=num[current];
    delay(15);
    current++;
    }

}
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