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

LiquidCrystal_I2C lcd(0x27, 16, 2);

const int trig = 9;
const int echo = 10;
long duration;
int distance;

void setup() {

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


  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
  

  lcd.setCursor(0, 0);
  lcd.print("Trena Ultrassom");
  delay(2000);
}

void loop() {

  digitalWrite(trig, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig, LOW);
  

  duration = pulseIn(echo, HIGH);
  

  distance = duration * 0.034 / 2;

  lcd.setCursor(0, 1);
  lcd.print("Distan.: ");
  lcd.print(distance);
  lcd.print("cm");
  

  delay(500);
}

lcd.clear();