IR Sensor based visitor counter:

Description:
In this project we are used simple IR Sensors, IR transmitter led and IR Receiver Led using LM358 circuit.IR Led supply voltage is +5v the output of the IR in this particular circuit is normally LOW 0 volt, the obstacle will cross the IR LED output is High > 4 volt.In this project the output of the IR LED pin is connected to the 8051 micro controller port pin P1.0. In this project 2*16 LCD is use to display the counting numbers. The LCD circuit RS pin P3.6 and E/N pin is P3.7 and DATA Pin is connected to PORT 0. In this project port 2 LED is connected to display the counting numbers in the LED also..In this project is used for bottle counting in the bottling plant like coca-cola, Pepsi, in this project slightly modification to display in the 7segment display also..

C Code:

/*program for IR Sensor based VISITOR COUNTER */

#include<reg51.h>
#include<string.h>
#define LCD_clear() LCD_command(0x01) /* Clear LCD Display
#define LCD_orgin()LCD_command(0x02) /* set to orgin LCD 
#define LCD_row1() LCD_command(0x80) /* Begin at 1st line
#define LCD_row2()LCD_command(0xc0) /* Begin at 2nd line


sbit port10=P1^0;       //IR Sensor Input
sbit rs=P3^6;             //Lcd Register Select Pin
sbit en=P3^7;           //Lcd Enable Pin


static unsigned char counter;

void lcd_en()      //Funtion for LCD Enable
 {
   en=1;
   en=0;
}

void LCD_delay(unsigned char ms) //Function for create Time Delay
{
 unsigned int n,i;
for(n=0;n<ms;n++)
  {
   for(i=0;i<1536;i++);
  }
}

void LCD_command(unsinged char command) //LCD Command Pass Funtion
 {
  rs=0;
  P0=command;
  lcd_en();
  LCD_delay(1);
}
void LCD_init() //LCD intialization funtion
{
 LCD_command(0x38);
 LCD_command(0x06);
 LCD_command(0x0c);
 LCD_command(0x01);
}
void LCD_putc(unasigned char ascii)
 {
  rs=1;
  P0=ascii;
  lcd_en();
  LCD_delay(2);
}
void LCD_puts(unsigned char *lcd_string)
 {
  while(*lcd_string)
    {
     LCD_putc(*lcd_string++);
   }
}
void disp(unsinged char name1)
  {
    rs=1;
    P0=name1;
    lcd_en();
    lcd_delay(300);
 }
void main()
 {
   port10=0;   //make P1.0 as init=0, initially all port pins are high
   P2=0;         //make low for P2
  LCD_init(); //call LCD initialization function 
while(1)                  //Run forever always true
  {
    if(port10)    //check condition P2.0 is high P2.0==1
     {
       LCD_command(0x80); //LCD command for display first line
       LCD_puts("visit count="); //String display in the LCD
        {
           disp(((counter%10000)/1000)+48);
           disp(((counter%1000)/100)+48);
           disp(((counter%100)/10)+48);
           disp(((counter%10)/1)+48);
        }
   }
  P2=counter;    // 8 LED's conneted in PORT 2
 LCD_comman(0xc0) //LCD command for display 2nd line
 LCD_puts("www.embed4u.com");
}
}