PRE-REQUISITES:

• PROTEUS BASICS
• KEIL(or any other compiler)

C FILE  AND PROTEUS FILE DOWNLOAD LINK BELOW.

CIRCUIT DIAGRAM:

CONNECT THE CIRCUIT AS SHOWN IN FIGURE.

• MAKE SURE YOUR CONNECTIONS ARE PROPER AS SHOWN IN FIGURE.
• THE CODE IS WORKING AND TESTED BY ME.
• YOU CAN TRY THIS CODE ON PROTEUS SIMULATOR ALSO.
• THE ABOVE IMAGE IS FROM PROTEUS.

IMPORTANT CONNECTIONS:

• KEYPAD=PORT 3 (4 rows and 4 columns).
• LCD(D0 TO D7)= P2.0 TO P2.7
• RS=P0.0
• E=P1.1.
• R/W= GROUND.

In this project the Lcd will display “Welcome to rolling display”.

after that it will ask user to enter any 5 digits, user have to enter 5 digits one by one and after 5 digits  all the digits will roll towards right.

USE KEIL OR ANY OTHER SOFTWARE TO CREATE HEX FILE AND BURN INTO 89C51 USING PROGRAMMER.

How to use Keil Uvision 5: click here

CODE

#include

#define msec 50

sbit rs=P0^0;   //Register select (RS   //Read write (RW) pin

sbit en=P0^1;   //Enable (EN) pin

sbit R1 = P3^0;

sbit R2 = P3^1;

sbit R3 = P3^2;

sbit R4 = P3^3;

sbit C1 = P3^4;

sbit C2 = P3^5;

sbit C3 = P3^6;

sbit C4 = P3^7;

void delay(int);

char Read_Keypad()

{

 C1=1;

 C2=1;

 C3=1;

 C4=1;

 R1=0;

 R2=1;

 R3=1;

 R4=1;

 if(C1==0){delay(100);while(C1==0);return ‘0’;}

 if(C2==0){delay(100);while(C2==0);return ‘4’;}

 if(C3==0){delay(100);while(C3==0);return ‘8’;}

 if(C4==0){delay(100);while(C4==0);return ‘C’;}

 R1=1;

 R2=0;

 R3=1;

 R4=1;

 if(C1==0){delay(100);while(C1==0);return ‘1’;}

 if(C2==0){delay(100);while(C2==0);return ‘5’;}

 if(C3==0){delay(100);while(C3==0);return ‘9’;}

 if(C4==0){delay(100);while(C4==0);return ‘D’;}

 R1=1;

 R2=1;

 R3=0;

 R4=1;

 if(C1==0){delay(100);while(C1==0);return ‘2’;}

 if(C2==0){delay(100);while(C2==0);return ‘6’;}

 if(C3==0){delay(100);while(C3==0);return ‘A’;}

 if(C4==0){delay(100);while(C4==0);return ‘E’;}

 R1=1;

 R2=1;

 R3=1;

 R4=0;

 if(C1==0){delay(100);while(C1==0);return ‘3’;}

 if(C2==0){delay(100);while(C2==0);return ‘7’;}

 if(C3==0){delay(100);while(C3==0);return ‘B’;}

 if(C4==0){delay(100);while(C4==0);return ‘F’;}

 return 0 ;

}

void delay(int time)  //Time delay function

{

unsigned int i,j;

for(i=0;i<time;i++)

  for(j=0;j<1275;j++);

}

void lcdcmd(unsigned char value)  //Function for sending values to the command register of LCD

{

P2=value;

rs=0;

en=0;

delay(15);

en=1;

return;

}

void lcddata(unsigned char value1)  //Function for sending values to the data register of LCD

{

rs=1;

P2=value1;

en=0;

delay(15);

en=1;

return;

}

void lcdstring(char *a)

{

int i;

for(i=0;a[i]!=’\0′;i++)

lcddata(a[i]);

}

void lcdinit(void)

{

lcdcmd(0X30);

delay(25);

lcdcmd(0X30);

delay(25);

lcdcmd(0X30);

delay(25);

lcdcmd(0x38); //set LCD in  5×7 mode

delay(20);

lcdcmd(0x0c);  //Cursor blinking

delay(20);

lcdcmd(0x01);  // clear LCD

delay(20);

lcdcmd(0x06);  //set cursor on  first position of first line on LCD

delay(20);

}

void main()

{ 

int i=0;

char a;

char c[4];

lcdinit();

lcdstring(“Welcome to”);

delay(5);

lcdcmd(0xc0);

lcdstring(“rolling display”);

delay(50);

lcdcmd(0x01);

lcdstring(“enter 5 digits”);

delay(100);

while(1)

{

for(i=0;i<5;i++)

{

while(!(c[i] = Read_Keypad())); //wait function till the key pressed

 delay(50);

delay(50);

lcdcmd(0x01);

lcddata(c[i]);

}

lcdinit();

for(i=0;i<5;i++)

{

lcddata(c[i]);

}

for(i=0;i<1000000000;i++)

{

lcdcmd(0x1c);

delay(30);

}

}

}

CLICK HERE TO DOWNLOAD C FILE.

CLICK HERE TO DOWNLOAD PROTEUS FILE

ALL THE BEST!!