code.c

/* Main.c file generated by New Project wizard
 *
 * Created:   Wed Jul 6 2022
 * Processor: AT89C51
 * Compiler:  Keil for 8051
 */

#include <reg51.h>
#include <stdio.h>

//lcd initialization
sbit rs= P0^0;
sbit rw= P0^1;
sbit en= P0^2;

//led initialization
sbit led_1= P3^0;
sbit led_2= P3^1;
sbit led_3= P3^2;

//start button
sbit start=P1^0;

void lcddta(unsigned char [],unsigned char);//lcd data function
void delay(unsigned int);//delay of 1 sec
void lcdcmd(unsigned char);//lcd command function
void lcdinit(void);//lcd initialization commands


//lcd data function
void lcddta(unsigned char a[],unsigned char len){
   unsigned char x;
   for(x=0;a[x]!='\0';x++){
      P2=a[x];
      rs=1;
      rw=0;
      en=1;
      delay(1000);
      en=0;
   }
}

//lcd cmd function
void lcdcmd(unsigned char p){
   P2=p;
   rs=0;
   rw=0;
   en=1;
   delay(1000);
   en=0;
}

//delay command
void delay(unsigned int k){
   int i,j;
   for (i=0;i<10;i++){
      for (j=0;j<k;j++){
      }
   }
}

//lcd commands initialization
void lcdinit(void){
   lcdcmd(0x38);
   lcdcmd(0x0e);
   lcdcmd(0x01);
   lcdcmd(0x06);
   lcdcmd(0x80);
}

//main function
void main(void){
   led_1=0;
   led_2=0;
   led_3=0;
   while(start==1){
      lcdinit();
      lcddta("Stop",4);
      led_1=1;//giving high pin to the led
      delay(50000);//a delay of 50 sec
      led_1=0;
      lcdinit();
      lcddta("Standby",7);
      led_2=1;
      delay(50000);
      led_2=0;
      lcdinit();
      lcddta("Go",2);
      led_3=1;
      delay(50000);
      led_3=0;
   }
}