#include <Wire.h>  // Library for I2C communication
#include <LiquidCrystal_I2C.h>  // Library for I2C LCD
#define echoPin 8 // Echo Pin of Ultrasonic Sensor
#define trigPin 9 // Trigger Pin of Ultrasonic Sensor
LiquidCrystal_I2C lcd(0x27, 16, 2);  // Set the LCD address to 0x27 for a 16 chars and 2 line display

void setup() {
  Serial.begin(9600);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  lcd.init();                      // Initialize the LCD
  lcd.backlight();                 // Turn on the backlight
}

void loop() {
  long duration, distance;
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = (duration / 2) / 29.1;  // Calculate distance in cm
  lcd.clear();  // Clear the LCD screen
  lcd.setCursor(0, 0); // Set cursor to first column and first row
  lcd.print("Distance: "); // Print text
  lcd.print(distance); // Print distance
  lcd.print(" cm"); // Print units
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");
  delay(500); // Delay between measurements
}