#include <Keypad.h>
#include <WiFi.h>
 
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

const uint8_t ROWS = 4;
const uint8_t COLS = 3;
char keys[ROWS][COLS] = {
  { '1', '2', '3' },
  { '4', '5', '6' },
  { '7', '8', '9' },
  { '*', '0', '#' }
};

uint8_t colPins[COLS] = { 15, 2, 4 }; // Pins connected to C1, C2, C3
uint8_t rowPins[ROWS] = { 27, 26, 25, 32 }; // Pins connected to R1, R2, R3, R4

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

Adafruit_SSD1306 oled = Adafruit_SSD1306(128, 64, &Wire);
char customKey;         //Variabel penampung input keypad
int number = 0;         //Variabel penampung nilai angka
int password = 1379;    //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);
  }
  oled.clearDisplay();
  
  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
  delay(2000);
  oled.display(); 
  oled.clearDisplay();// menampilkan display OLED
}

void loop() {
  oled.setTextSize(1);
  oled.setTextColor(WHITE); 
  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.setTextSize(1);
      oled.setTextColor(WHITE); 
      oled.setCursor(0,10);
      number = number * 10 + (customKey - '0');
      oled.print(number);
      oled.display();
      oled.clearDisplay(); 
    break;

    //------------Jika input '#' maka cek password------------//
    case '#':
      if(number == password){          //Jika password benar, maka
        oled.setTextSize(1);
        oled.setTextColor(WHITE); 
        oled.setCursor(0,10);
        oled.print("Access Accepted ");  //Tampilan LCD
        number = 0;
        oled.display();
        oled.clearDisplay(); 
      }
      else{                             //Jika salah, maka
        oled.setTextSize(1);
        oled.setTextColor(WHITE); 
        oled.setCursor(0,10);
        oled.print("Invalid Password");  //Tampilan LCD
        oled.display();
        delay(2000);
        number = 0;
        oled.clearDisplay();
      }
    break;

    //------------Jika input '*' maka hapus tampilan------------//
    case '*':
      number = 0;
      oled.clearDisplay();
      oled.setCursor(0,0);
      oled.print("Input Password");
      oled.display();
    break;
  }
}/* Program Kunci Pintu dengan password input Keypad 4x4 dibuat oleh Indobot */