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

#define TINGGI_LAYAR 64
#define LEBAR_LAYAR 128

const byte ROWS = 4;
const byte COLS = 4;

Adafruit_SSD1306 oled(LEBAR_LAYAR, TINGGI_LAYAR, &Wire, -1);

char Keys[ROWS][COLS] = {
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};

byte rowPins[ROWS] = { 14, 12, 19, 18 }; 
byte colPins[COLS] = { 5, 4, 2, 15 };

Keypad customKeypad = Keypad( makeKeymap(Keys), rowPins, colPins, ROWS, COLS);

char customKey;
int number = 0;
int password = 13579;

void setup() {
  pinMode(26, OUTPUT);
  pinMode(27, OUTPUT);
  pinMode(35, OUTPUT);

  Serial.begin(9600);


  if (!oled.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("failed to start SSD1306 OLED"));
    while (1);
  }
  oled.clearDisplay();
  
  oled.setTextSize(1);
  oled.setTextColor(WHITE);
  oled.setCursor(20, 20);
  oled.println("WELCOME GAES");
  delay(2000);
  oled.display(); 
  oled.clearDisplay();
}

void loop() {
  oled.setTextSize(1);
  oled.setTextColor(WHITE); 
  oled.setCursor(0,0);
  oled.print("Input Password");
  
  customKey = customKeypad.getKey();

  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;

    case '#':
      if(number == password){
        oled.setTextSize(1);
        oled.setTextColor(WHITE); 
        oled.setCursor(0,10);
        oled.print("Access Accepted ");
        number = 0;
        oled.display();
        digitalWrite(27, HIGH);
        digitalWrite(26, LOW);
        tone(35, 150);
        delay(1000);
        oled.clearDisplay(); 
      }
      else{
        oled.setTextSize(1);
        oled.setTextColor(WHITE); 
        oled.setCursor(0,10);
        oled.print("Invalid Password");
        oled.display();
        digitalWrite(27, LOW);
        digitalWrite(26, HIGH);
        tone(35, 100);
        delay(2000);
        number = 0;
        oled.clearDisplay();
      }
    break;

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