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

Aim:

To implement code for “Measuring distance of an object using ultrasonic distance sensor (HC-SR04).

Objective:

• Measuring the distance of an object using Ultrasonic Distance Sensor (HC-SR04)
• Usage of Input Capture Mode

Highlights:

• Measuring the distance travelled by the wave to the object and gets bounced back from the object to sensor.
• Measuring Pulse width using Input Capture Mode

Deliverables:

• The distance travelled by a wave to the object for which we want to measure the distance using Ultrasonic Distance Sensor (HC-SR04).
• Measuring Pulse width using Input Capture Mode of Timer 1

Code:

#include 
#define F_CPU 16000000ul
#include 
#include 
#include 
#include 


#define lcd_data_dir DDRD         
#define lcd_command_dir DDRC      
#define lcd_data_port PORTD       
#define lcd_command_port PORTC      
#define EN PC2                      
#define RW PC3                       
#define RS PC4                      

void lcd_command(char);                     
void lcd_char(char);                        
void lcd_init(void);                         
void lcd_string(char*);                   
void lcd_string_xy (char,char,char*);          

void lcd_command (char cmd)                    
{
	lcd_data_port = cmd;                          
	lcd_command_port&=~((1<




Circuit:


The program is loaded in the Atmega 32 chip.
LCD pins are connected to the Atmega32 as shown above.
Osillocope and ultrasonic sensors are connected to view the output.

Output:


60.38 cm is the distance of an object obtained.

Result:
Thus the implementation of code for “Measuring distance of an object using ultrasonic distance sensor (HC-SR04) is done.