#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <Keypad.h>
#define LEBAR_LAYAR 128 // Lebar layar OLED yang digunakan
#define TINGGI_LAYAR 64 // Tinggi layar OLED yang digunakan


Adafruit_SSD1306 oled(LEBAR_LAYAR, TINGGI_LAYAR, &Wire, -1);
const int BARIS = 4;
const int KOLOM = 4;
char keys[BARIS][KOLOM] = {
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};

byte rowPins[BARIS] = {19, 18, 5, 4};//connect to the row pinouts of the keypad
byte colPins[KOLOM] =  {2, 15, 13, 12};
Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, BARIS, KOLOM);  

char customKey;         //Variabel penampung input keypad
int number = 0;         //Variabel penampung nilai angka
int password = 1379;    //Password

void setup()
{
  Serial.begin(9600);
  if (!oled.begin(SSD1306_SWITCHCAPVCC, 0x3C)) 
  {
    Serial.println(F("failed to start SSD1306 OLED"));
    while (1);
  }
  pinMode(27, OUTPUT);
  pinMode(26, OUTPUT); 
  pinMode(25, OUTPUT);      
  oled.clearDisplay(); // clear display
  oled.setTextSize(1);         // Atur ukuran text
  oled.setTextColor(WHITE);    // Atur warna text
  oled.setCursor(20, 20);       // Atur posisi text pada display
  oled.println("SELAMAT DATANG"); // Text yang dicetak
  oled.display(); 
  delay(2000);
  oled.clearDisplay();
}

void loop()
{
  oled.setCursor(0,0);
  oled.print("Input Password");
  oled.display();  
  customKey = keypad.getKey(); 
  switch(customKey){
    case '0' ... '9':
      oled.setCursor(0,0);
      oled.print("Input Password");
      oled.display();  
      oled.setCursor(0,15);
      number = number * 10 + (customKey - '0');
      oled.print(number);
      oled.display();
    break;

    case '#':
      if(number == password){
        oled.clearDisplay();  
        oled.setCursor(0,0);
        oled.print("Input Password");
        oled.display();   
        oled.setCursor(0,15);
        digitalWrite(25,HIGH);
        oled.print("Access Accepted ");
        oled.display();
        delay(1000);
        digitalWrite(25,LOW);
        number = 0;
        oled.clearDisplay();
      }
      else{
        oled.clearDisplay();
        oled.setCursor(0,0);
        oled.print("Input Password");
        oled.display();                         
        oled.setCursor(0,15);
        oled.print("Invalid Password");  
        oled.display();
        number = 0;
        digitalWrite(27, HIGH);
        tone(26,50);
        delay(1000);
        digitalWrite(27, LOW);
        noTone(26);
        oled.clearDisplay();
      }
    break;

    case '*':
      number = 0;
      oled.clearDisplay();
  }
}