#include <Wire.h>
#include <LiquidCrystal_I2C.h>

// Initialize the LCD with the I2C address 0x27 for a 16x2 LCD
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Define the pins for the ultrasonic sensor
const int trigPin = 7;
const int echoPin = 6;

// Define variables to store the duration and distance
long duration;
int distance;

void setup() {
  // Initialize the LCD and turn on the backlight
  lcd.begin(16, 2);
  lcd.backlight();
  
  // Set up the ultrasonic sensor pins
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);

  // Print initial message on LCD
  lcd.setCursor(0, 0);
  lcd.print("Distance: ");
}

void loop() {
  // Clear the trigPin
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);

  // Send a 10 microsecond pulse to the trigPin
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Read the echoPin and calculate the duration
  duration = pulseIn(echoPin, HIGH);

  // Calculate the distance in centimeters
  distance = duration * 0.034 / 2;

  // Display the distance on the LCD
  lcd.setCursor(10, 0); // Move the cursor to the right part of the screen
  lcd.print("    ");    // Clear previous value
  lcd.setCursor(10, 0); // Set cursor again
  lcd.print(distance);  // Display the distance
  lcd.print(" cm");

  // Wait for a short period before taking another measurement
  delay(500);
}