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

LiquidCrystal_I2C lcd(0x27, 16, 2);

#define TRIG_PIN 10
#define ECHO_PIN 9

void setup() {
  Serial.begin(9600);

  lcd.init();
  lcd.backlight();

  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
}

void loop() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  long duration = pulseIn(ECHO_PIN, HIGH);

  float distanceCm = duration * 0.034 / 2;

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

  lcd.setCursor(0, 0);
  lcd.print("Distance: ");

  lcd.setCursor(0, 1);
  lcd.print(distanceCm);
  lcd.print(" cm");

  delay(500);
}