#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,16,2);

int trig = 2;
int echo = 3;
int led = 13;
int buzzer = 12;
long duretion, distance;

void setup() {
  pinMode(trig,OUTPUT);
  pinMode(echo,INPUT);
  pinMode(led,OUTPUT);
  pinMode(buzzer,OUTPUT);
    
  lcd.init();
  lcd.clear();
  lcd.backlight();

  lcd.setCursor(2,0);
  lcd.print("Oddalecenost");

  lcd.setCursor(1,1);
  lcd.print("Radar :");
  delay(2000);
  
  lcd.clear();
}

void loop() {
  digitalWrite(trig,HIGH);
  delayMicroseconds(2);
  digitalWrite(trig,LOW);
  delayMicroseconds(10);
  digitalWrite(trig,HIGH);
  digitalWrite(led,HIGH);
  delay(100);
  digitalWrite(led,LOW);
  digitalWrite(buzzer,HIGH);
  delay(100);
  digitalWrite(buzzer,LOW);

  duretion = pulseIn(echo,HIGH);
  distance = (duretion/2)*0.0346;

  lcd.setCursor(3,0);
  lcd.print(distance);

  lcd.setCursor(6,0);
  lcd.print("cm");
}