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

LiquidCrystal_I2C lcd(0x27,16,2);

#define TRIGGER_PIN  A0   
#define ECHO_PIN     A1
#define MAX_DISTANCE 400
NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE);

const int buzz = 13;
int jarak;

void setup() {
  pinMode(buzz, OUTPUT);
  lcd.init();
  lcd.clear();
  lcd.backlight();

  lcd.setCursor(2,0);
  lcd.print("Ukur Jarak");

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

void loop() {
  lcd.setCursor(0,0);
  lcd.print("Jarak: ");
  lcd.setCursor(7,0);
  lcd.print(sonar.ping_cm());
  lcd.setCursor(10,0);
  lcd.print("cm");
  lcd.setCursor(3,1);
  lcd.print("20.240.147");

  jarak = sonar.ping_cm();

  if(jarak <= 40){
    digitalWrite(buzz, HIGH);
    delay(500);
    digitalWrite(buzz, LOW);
    delay(500);
  }
  
}