Arduino and Ultrasonic sensor Interfacing

Interfacing Ultrasonic Sensor (HC-SR04) with Arduino

Pin Configuration of Ultrasonic Sensor

See Also: Arduino Development Platform

Code in Action: 

Code:

#include <Wire.h> 

#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,16,2);

// defines pins numbers

const int trigPin = 2;

const int echoPin = 3;

// defines variables

long duration;

int distance;

void setup() {

  lcd.init();    // initialize the lcd 

  lcd.backlight();  // lcd backlight ON

  lcd.setCursor(0,0);  // 0 row, 0 column

  

  pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output

  pinMode(echoPin, INPUT); // Sets the echoPin as an Input

//  Serial.begin(9600); // Starts the serial communication

}

void loop() {

  lcd.clear();

  // Clears the trigPin

  digitalWrite(trigPin, LOW);

  delayMicroseconds(2);

  // Sets the trigPin on HIGH state for 10 micro seconds

  digitalWrite(trigPin, HIGH);

  delayMicroseconds(10);

  digitalWrite(trigPin, LOW);

  // Reads the echoPin, returns the sound wave travel time in microseconds

  duration = pulseIn(echoPin, HIGH);

  // Calculating the distance

  distance = duration * 0.034 / 2;

  // Prints the distance on the Serial Monitor

//  Serial.print("Distance: ");

//  Serial.println(distance);

  lcd.print("Distance:");

  lcd.print(distance);

  lcd.print(" cm");

  delay(200);

}

See Also: Arduino Development Platform