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

#define trigPin 9
#define echoPin 8

LiquidCrystal_I2C lcd(0x27, 16, 2); // Address 0x27 may need adjustment

void setup() {
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  lcd.begin(16, 2);  
  lcd.backlight();
  Serial.begin(9600); // For debugging in Serial Monitor
}

void loop() {
  long duration;
  int distance;

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

  // Send out an ultrasonic pulse
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Read the echo time in microseconds
  duration = pulseIn(echoPin, HIGH);

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

  // Display distance on LCD
  lcd.clear();
  delay(10); // Give LCD time to clear
  lcd.setCursor(0, 0);
  lcd.print("Distance: ");
  lcd.print(distance);
  lcd.print(" cm");

  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");

  delay(500); // Update every half second
}