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

#define pinTrig 3
#define pinEcho 2
#define pinBuz 13

long waktu, jarak;

LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  Serial.begin(9600);
  pinMode(pinBuz, OUTPUT);
  pinMode(pinTrig, OUTPUT);
  pinMode(pinEcho, INPUT);
  
  lcd.begin(16, 2);
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Jarak: ");
}

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

  waktu = pulseIn(pinEcho, HIGH);
  jarak = waktu / 58.2;

  lcd.setCursor(10, 0);
  lcd.print("     ");
  lcd.setCursor(10, 0);
  lcd.print(jarak);
  lcd.print(" cm");

  if (jarak < 250 && jarak >= 200) {
    tone(pinBuz, 100);
    delay(50);
    noTone(pinBuz);
    delay(200);
  } else if (jarak < 200 && jarak >= 150) {
    tone(pinBuz, 200);
    delay(50);
    noTone(pinBuz);
    delay(150);
  } else if (jarak < 150 && jarak >= 100) {
    tone(pinBuz, 400);
    delay(50);
    noTone(pinBuz);
    delay(50);
  } else if (jarak < 100 && jarak >= 2) {
    tone(pinBuz, 500);
    delay(50);
    noTone(pinBuz);
  } else {
    noTone(pinBuz);
  }

  delay(100);
}