#include <LiquidCrystal_I2C.h>

// Define LCD parameters
int lcdColumns = 16;
int lcdRows = 2;
LiquidCrystal_I2C lcd(0x27, lcdColumns, lcdRows);

// Define ultrasonic sensor pins
const int trigPin = 0;
const int echoPin = 4;
long duration;
int distance;

void setup(){
  // Initialize LCD
  lcd.init();
  lcd.backlight();

  // Initialize ultrasonic sensor pins
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);

  // Set initial message on the LCD
  lcd.setCursor(3, 0);
  lcd.print("Ultrasonic");
  lcd.setCursor(2, 1);
  lcd.print("Distance Sensor");
  delay(2000);
  lcd.clear();
}

void loop(){
  // Clear previous display
  lcd.clear();
  
  // Send a 10us HIGH pulse to trigger pin
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Measure the echo pulse duration
  duration = pulseIn(echoPin, HIGH);
  
  // Calculate the distance in centimeters
  distance = duration * 0.034 / 2;
  
  // Display distance on the LCD
  lcd.setCursor(0, 0);
  lcd.print("Distance:");
  lcd.setCursor(10, 0);
  lcd.print(distance);
  lcd.print(" cm");

  delay(1000);  // Wait for a second before the next measurement
}