countdown_alarm

#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,20,4);  // Kalau gagal ganti 0x3F ke 0x27 for a 16 chars and 2 line display

// digital pin 2 has a pushbutton attached to it. Give it a name:
int pushButton = 3;
int alarm = 8;
int S = 60; // count seconds
boolean Start = false;

// the setup routine runs once when you press reset:
void setup() {
  lcd.init(); // initialize the lcd
  // initialize serial communication at 9600 bits per second:
  Serial.begin(9600);
  // make the pushbutton's pin an input:
  pinMode(pushButton, INPUT_PULLUP);
  pinMode(alarm, OUTPUT);
}

// the loop routine runs over and over again forever:
void loop(void) {

  // read the input pin:
  int buttonState = digitalRead(pushButton);
  if(int buttonState = digitalRead(pushButton) == 1)
  {
    S--;
    delay(1000);

    if(S>9)
    {
      lcd.backlight();
      lcd.clear();
      lcd.setCursor(0,3);
      lcd.print("Awas Pintu Terbuka.!");
      lcd.setCursor(0,2);
      lcd.print(S);
      alarmBip();
    }
    else
    {
      lcd.backlight();
      lcd.clear();
      lcd.setCursor(0,3);
      lcd.print("Awas Pintu Terbuka.!");
      lcd.setCursor(0,2);
      lcd.print("0");
      lcd.setCursor(1,2);
      lcd.print(S);
      lcd.setCursor(2,2);
      lcd.print(" ");
      alarmBip();
    }

    if(S == 0 && S<9)
    {
      lcd.backlight();
      lcd.clear();
//      lcd.setCursor(0,3);
//      lcd.print("Segera Tutup Pintu.!");
      lcd.setCursor(0,2);
      lcd.print("0");
      alarmConstant();
    }
  }

  if(int buttonState = digitalRead(pushButton) == 0)
  {
    lcd.backlight();
    lcd.clear();
    lcd.setCursor(0,3);
    lcd.print("Pintu Tertutup");
    delay(1000);
    S = 60;
    alarmOff();

  }
}

void alarmBip()
{
  digitalWrite(alarm, HIGH);
  delay(100);
  digitalWrite(alarm, LOW);
  delay(100);
}

void alarmConstant()
{
  digitalWrite(alarm, HIGH);
}

void alarmOff()
{
  digitalWrite(alarm, LOW);
}