#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

const int trigpin = 10;
const int echopin = 9;

long duration;
int distance;

void setup() {
  lcd.init();
  lcd.backlight();

  pinMode(trigpin, OUTPUT);
  pinMode(echopin, INPUT);

  lcd.print("Distance:");
}

void loop() {
  digitalWrite(trigpin, LOW);
  delayMicroseconds(2);

  digitalWrite(trigpin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigpin, LOW);
  
  duration = pulseIn(echopin, HIGH);

  distance = duration * 0.034 / 2;

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

  lcd.setCursor(0, 1);
  lcd.print(distance);
  lcd.print("cm");
  
  delay(1000);
}