Question

A PIC C code for Interfacing Ultrasonic sensor using PIC C 18F8722 microcontroller

 

Answer 1

#define trig RB0
#define echo RB1
#include <xc.h>

// Control Pin Declarations
#pragma config FOSC = HS      
#pragma config WDTE = OFF     
#pragma config PWRTE = ON     
#pragma config BOREN = ON     
#pragma config LVP = OFF      
#pragma config CPD = OFF      
#pragma config WRT = OFF      
#pragma config CP = OFF       

int t,S;

int main()
{
    TRISB0 = 0; //make trigger pin as output pin
    TRISB1 = 1; //make echo pin as input pin     
      
    T1CON=0x20;

      
    while(1)
    {
        TMR1H =0; TMR1L =0; //clear the timer bits
      
        trig= 1;
        __delay_us(10);         
        trig = 0;
      
        while (echo==0);
            TMR1ON = 1;
        while (echo==1);
            TMR1ON = 0;
      
        t = (TMR1L | (TMR1H<<8));        // time take for receiving echo
        S = (0.0272*t)/2;   // Distance measured  
          
      
    }
    return 0;
}