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

const int trigPin = 3;
const int echoPin = 2;

LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address 0x27, 16 column and 2 rows

void setup() {
  Serial.begin(9600);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);

  lcd.begin(16, 2);  // initialize the lcd
  lcd.backlight();
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Distance: ");
}

void loop() {
  long duration, distance;
  
  // Clear the previous distance value
  lcd.setCursor(10, 0);
  lcd.print("      ");

  // Trigger the ultrasonic sensor
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Measure the duration of the echo
  duration = pulseIn(echoPin, HIGH);

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

  // Display the distance on the LCD
  lcd.setCursor(10, 0);
  lcd.print(distance);
  lcd.print(" cm");

  delay(1000);  // Add a delay for better readability
}