Project 2 - Measuring distance of an object using ultrasonic sensor (HC-SR04)

 1)

/*

 * AVR PROJECT 2(FINAL).c

 *

 * Created: 9/11/2023 11:50:23 AM

 * Author : adaik

 */ 

#include

#define F_CPU 16000000L

#include

#include "avr/interrupt.h"

#define trigger_pin PB1

//#include

unsigned int a,b,c;

ISR(TIMER1_CAPT_vect)

{

if((TCCR1B &(1<

{                                   //Check if capture for is active for rising mode

    a = ICR1; //store the capture value into variable a

TCCR1B &= ~(1<

}

else if((TCCR1B&(0x00)) == 0){ //Check if capture for is active for falling mode

b = ICR1; //store the capture value into variable b

TCCR1B |= (1<

c = b-a;                             // Subtract the a register from b

   // Serial.println(c);

} 

}

   void Capture_Init(void){

   //Enable the required timer function

   TCCR1A  = 0x00; //Normal mode operation

   //Set the mode of the timer1 Input capture

   TIMSK1 |= (1<

   //Set the prescaler for the timer

   TCCR1B |= (1<

   //Set the edge detection bit

   TCCR1B |= (1<

   //Set Timer initial value

   ICR1 = 0; // ICR1 register is 0;

   }

int main()

{

    DDRB|=(1<<1>

DDRB&=~(1<<0>

//Serial.begin(9600);

while(1)

{

PORTB|=(1<<1>

_delay_us(15);

PORTB&=~(1<<1>

}

Capture_Init();

}