[sai]

why we will use sbit is that mandatory?

[sai]

can any one explin me about this code to measure distance  in mm using 3 pin ultrasonic sensor…plz…

 

 

#include<reg51.h>

#include<intrins.h>   

#include<lcd_busy.h>

#define lcd_port P1

 

 

 

bit rec_flag=0;

bit data_flag=0;

void lcd_dispaly();

void int_char_con(void);

void serial_init();

unsigned char array[5],count=0,dis_count=0;

unsigned char rec=0;

unsigned int dis=0,rot_count=0,ror_flag=0,step=0;

unsigned int dis_array[10],direction_count=0,loop_count=0;

unsigned int THOUSANDS,HUNDREDS, TENS, UNITS, DISTANCE, TEMP_VAL;

////////////////////////////////

 

 

void main()

{

// buzzer=0;

lcd_init();

lcd_init();

serial_init();

serial_init();

message(0x80,”Ultrasonic target”);

delay(500);

init(0x01);

while(1)

{

 

if(data_flag==1)

{

ES=0;

rec_flag=0;

data_flag=0;

DISTANCE=array[1]*256+array[2];

 

lcd_dispaly();

 

 

 

 

 

 

 

delay(5);

count=0;

ES=1;

}

}

}

//////////////////////////

void serial_init()

{

SCON=0X50;         //SM2 SM1 SM0 REN TB8 RB8 TI RI   G C/T M1 M0 G C/T M1 M0

TMOD=0X20; //0010 0000 // 0   0   1   1   0   0   0  0    0  0  1 0 0  0  0 0

TH1=0XFD; //9600

TR1=1;

EA=1;

ES=1;

}

////////////////////////////

void serial(void) interrupt 4

{

if(RI==1)

{

RI=0;

rec=SBUF;

if(rec==0xff)

{

rec_flag=1;

}

 

if(rec_flag==1)

{

array[count++]=SBUF;

if(count=)

data_flag=1;

}

}

}

/////////////////////////////////////////////

void lcd_dispaly()

{

 

 

int_char_con();

dis_count=0;

}

 

void int_char_con(void)

{

init(0x80);

THOUSANDS = DISTANCE/1000;//to get thousands num

TEMP_VAL = DISTANCE%1000;

HUNDREDS = TEMP_VAL/100; //to get hundreds num

TEMP_VAL %= 100;

TENS = TEMP_VAL/10; //to get tens num

UNITS = TEMP_VAL%10;

 

write_lcd(THOUSANDS+0x30);

write_lcd(HUNDREDS+0x30);

write_lcd(TENS+0x30);

write_lcd(UNITS+0x30);

}

 

 

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