#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
int buzzerPin = 13;
int ledPin = 5;

void setup() {
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0,0);
  lcd.print("Alat Pendeteksi");
  lcd.setCursor(0,1);
  lcd.print("Kebocoran Gas");
  delay(2000);
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("By:");
  lcd.setCursor(0,1);
  lcd.print("Kelompok 8");
  delay(2000);

  Serial.begin(9600);
  pinMode(A1, INPUT);
  pinMode(2, INPUT);
  pinMode(buzzerPin, OUTPUT);
  pinMode(ledPin, OUTPUT);
}

void loop() {
  int ketebalanGas = analogRead(A1);
  Serial.print("Sinyal Analog: ");
  Serial.println(ketebalanGas);
  Serial.print("Sinyal Digital: ");
  Serial.println(digitalRead(2));
  delay(300);
  lcd.setCursor(0,0);
  
  if (ketebalanGas >= 0 && ketebalanGas < 200) {
    lcd.print("Gas Aman         ");
    noTone(buzzerPin);
    digitalWrite(ledPin, LOW);
  }
  else if (ketebalanGas >= 200 && ketebalanGas < 400) {
    lcd.print("Butuh Pengawasan   ");
    digitalWrite(ledPin, millis() % 3000 < 1000);
    if (millis() % 500 < 50)
      tone(buzzerPin, 500);
    else
      noTone(buzzerPin);
  }
  else {
    lcd.print("Gas Bocor!        ");
    digitalWrite(ledPin, HIGH);
    tone(buzzerPin, 1000);
  }
  lcd.setCursor(0,1);
  lcd.print("Ketebalan= ");
  lcd.print(ketebalanGas);
  
  delay(300);
}