#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 byte BARIS = 4; //Jumlah Baris Keypad
const byte KOLOM = 4; //Jumlah Kolom Keypad

char hexaKeys[BARIS][KOLOM] = {

  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}

};
byte rowPins[BARIS] = { 14, 12, 19, 18 };

byte colPins[KOLOM] = { 5, 4, 2, 15 };

Keypad customKeypad = Keypad(makeKeymap(hexaKeys), rowPins, colPins, BARIS, KOLOM);
char customKey;         //Variabel penampung input keypad
int number = 0;         //Variabel penampung nilai angka
int password = 1111;    //Password


void setup() {
  Serial.begin(9600);

  // initialize OLED display with I2C address 0x3C
  if (!oled.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("failed to start SSD1306 OLED"));
    while (1);
  }

  delay(2000);         
  oled.clearDisplay(); // clear display

  oled.setTextSize(1);         // Atur ukuran text
  oled.setTextColor(WHITE);    // Atur warna text
  oled.setCursor(0, 10);       // Atur posisi text pada display
  oled.println("Keypad ESP32"); // Text yang dicetak
  delay(2000);
  oled.display(); 
  oled.clearDisplay();// menampilkan display OLED
}

void loop() {
oled.display(); 
 

   oled.setCursor(0,0);
  oled.print("Input Password");      //Tampilan pada layar LCD
  
  customKey = customKeypad.getKey();    //Baca input keypad

  //------------Prosedur jika input berupa angka------------//
  switch(customKey){
    case '0' ... '9':
      oled.setCursor(0,10);
      number = number * 10 + (customKey - '0');
    oled.print(number);
    break;

    //------------Jika input '#' maka cek password------------//
    case '#':
      if(number == password){           //Jika password benar, maka
        oled.setCursor(0,20);
 oled.print("Access Accepted ");  //Tampilan LCD
        number = 0;
        oled.display(); 
        delay(2000);
         oled.clearDisplay();
       
      }
      else{                             //Jika salah, maka
        oled.setCursor(0,20);
        oled.print("Invalid Password");  //Tampilan LCD
        delay(2000);
        number = 0;
        oled.display();
        delay(2000); 
         oled.clearDisplay();
      
      }
    break;

    //------------Jika input '*' mak hapus tampilan------------//
    case '*':
      number = 0;
       oled.clearDisplay();
    break;
  }
}