code for automatic light control system, ece projects

/* This is the EMBEDDED C code for Automatic Light Control system */

#include<AT89X51.H>
#include<LCD_8_BIT.H>
//====================== ir pair init =========================
sbit ir1=P1^0;
sbit ir2=P1^1;
//====================== Lights init ==============================
sbit l1=P3^0;
sbit l2=P3^1;
sbit l3=P3^2;
sbit l4=P3^3;
//====================== delay function ========================
void Delay(unsigned int itime)
{
 unsigned int i,j;
 for(i=0;i<itime;i++)
  for(j=0;j<1257;j++);
}
//====================== main function ===========================
void main()
{
ir1=1;ir2=1;
l1=0;l2=0;l3=0;l4=0;
  lcd_init();
           lcd_clear();
           lcd_print("   Welcome To");
           lcd_cmd(0xC0);
           lcd_print("  Y.P.R College");
  Delay(400);
  lcd_clear();
           lcd_print(" Automatic Room");
           lcd_cmd(0xC0);
           lcd_print("  Light Control");
           Delay(200);
while(1)
{
//l1=1;l2=0;l3=0;l4=0;
if((ir1 == 1) && (ir2 == 1))
{
l1=1;l2=0;l3=0;l4=0;
Delay(200);
lcd_clear();
            lcd_print("Normal Light");
            lcd_cmd(0xC0);
            lcd_print(" Is  ON");
          Delay(200);
}
else if((ir1 == 0) && (ir2 == 1))
{
l1=1;l2=1;l3=0;l4=0;
Delay(200);
lcd_clear();
            lcd_print("  First Light");
            lcd_cmd(0xC0);
            lcd_print("With Normal Light");
            Delay(200);
}
else if((ir1 ==1) && (ir2 == 0))
{
l1=1;l2=0;l3=1;l4=0;
Delay(200);
lcd_clear();
            lcd_print("   Second Light");
            lcd_cmd(0xC0);
            lcd_print("With Normal Light");
            Delay(200);
}
else if((ir1 ==0) && (ir2 == 0))
{
l1=1;l2=1;l3=1;l4=1;
Delay(200);
lcd_clear();
            lcd_print("All Lights");
            lcd_cmd(0xC0);
            lcd_print(" Are   ON");
            Delay(200);
}
}
}







//LCD PROTOTYPES
void Delay();
void lcd_init(); //lcd initialisation
void lcd_clear(); //clear display
void lcd_cmd(unsigned char); //set the lcd address or command
void lcd_print(unsigned char *);   //write the string to LCD
//===============================================
sbit RS =P3^6; //RESET
sbit EN =P3^7; //ENABLE
#define LCD P2 //DATA0-DATA7 TO P2
//===============================================
unsigned char i;
//===============================================
void Delay1()
  {
unsigned char j;
for(i=0;i<15;i++)
for(j=0;j<100;j++);
  }
//===============================================
void lcd_init()
 {
lcd_cmd(0x38);
lcd_cmd(0x01);
lcd_cmd(0x0C);
lcd_cmd(0x06);
lcd_cmd(0x80);
 }
//===============================================
void lcd_clear(void)
 {
lcd_cmd(0x01);
lcd_cmd(0x80);
 }
 //===============================================
/* void lcd_char(unsigned char dat)
  {
LCD =dat;
RS =1;
EN =1;
for(i=0;i<100;i++);
EN =0;
for(i=0;i<100;i++);
  }
 */
//===============================================
void lcd_cmd(unsigned char cmd)
  {
Delay1();
LCD =cmd;
RS =0;
EN =1;
for(i=0;i<120;i++);
EN =0;
for(i=0;i<120;i++);
  }
//===============================================
void lcd_print(unsigned char *str)
{
while(*str)
 {
LCD =*str;
RS =1;
EN =1;
Delay1();
EN =0;
str++;
 }
}
//===============================================