ULTRASONIC RANGE FINDER USING ARDUINO

Ultrasonic distance measurement 

using HC-SR04 sensor

The project using to measure distance from 

the HC-SR04 Ultrasonic sensor 

PARTS NEEDED 

Arduino uno

LCD 16x2

HC-SR04 Ultrasonic sensor 

Bread board 

jumper wires

and a computer only for programming 

CONNECTING OF LCD TO THE ARDUINO 

* LCD RS pin to digital pin 12

 * LCD Enable pin to digital pin 11

 * LCD D4 pin to digital pin 5

 * LCD D5 pin to digital pin 4

 * LCD D6 pin to digital pin 3

 * LCD D7 pin to digital pin 2

 * LCD R/W pin to ground

 * ends to +5V and ground(A,K) for the lcd backlight 

 * wiper to LCD VO pin (pin 3) or connect the lcd 3rd pin to ground through 1K 

resistor 

CONNECTING OF HC-SR04 TO ARDUINO 

*VCC to +5v

*GND to ground 

*trigpin to digital pin 9

*echopin to digial pin 10

THE PROGRAM CODE

/*Ultrasonic Sensor HC-SR04 and Arduino project

*/

#include <LiquidCrystal.h> // includes the LiquidCrystal Library

LiquidCrystal lcd(12, 11, 5, 4, 3, 2); // Creates an LCD object. Parameters: (RS, enable, D4,D5,D6,D7)

const int trigPin = 9;

const int echoPin = 10;

long duration;

int distanceCm, distanceInch;

void setup()

 {

lcd.begin(16,2); // Initializes the interface to the LCD screen, and specifies the dimensions (width and height) of the display

pinMode(trigPin, OUTPUT);

pinMode(echoPin, INPUT);}

void loop()

 {

digitalWrite(trigPin, LOW);

delayMicroseconds(2);

digitalWrite(trigPin, HIGH);

delayMicroseconds(10);

        digitalWrite(trigPin, LOW);

duration = pulseIn(echoPin, HIGH);

distanceCm= duration*0.034/2;

distanceInch = duration*0.0133/2;

lcd.setCursor(0,0); // Sets the location at which subsequent text written to the LCD will be displayed

        lcd.print("Distance: "); // Prints string "Distance" on the LCD

        lcd.print(distanceCm); // Prints the distance value from the sensor

lcd.print(" cm");

delay(10);

lcd.setCursor(0,1);

lcd.print("Distance: ");

lcd.print(distanceInch);

lcd.print(" inch");

delay(10);

}

//and just upload the code and see the magic of arduino  !