#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.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);

#include <Keypad.h>

#define ledBenar 26
#define ledSalah 27

const byte baris = 4;
const byte kolom = 4;
char keys[baris][kolom] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};
byte pinBaris[baris] = {14, 12, 19, 18};
byte pinKolom[kolom] = {5, 4, 2, 15};
char key;
String keyAkhir;
String password = "4321";
Keypad keypad = Keypad( makeKeymap(keys), pinBaris, pinKolom, baris, kolom );

int display=0;
void setup() {
  Serial.begin(115200);
  if (!oled.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("failed to start SSD1306 OLED"));
    while (1);
  }

  pinMode(ledBenar,OUTPUT);
  pinMode(ledSalah,OUTPUT);
  oled.clearDisplay();
  oled.setTextSize(1);
  oled.setTextColor(WHITE);
  oled.display(); 
}

void loop() {
  key = keypad.getKey();
  if (key) {
      if(key=='*'){
          oled.clearDisplay();
          keyAkhir="";
          display=0;
          }
  }
  
  if(display==0){
    digitalWrite(ledBenar,LOW);
    digitalWrite(ledSalah,LOW);
    oled.setTextSize(1);
    oled.setTextColor(WHITE);
    oled.setCursor(0, 0);
    oled.println("Masukkan Password!");
    oled.display(); 
    oled.setTextSize(1);
    oled.setTextColor(WHITE);
    oled.setCursor(0, 10);
    oled.println(keyAkhir);
    oled.display(); 
    
    key = keypad.getKey();
    if (key) {
      if(key=='#'){
        oled.clearDisplay();
        display=1;
        }else if(key=='*'){
          oled.clearDisplay();
          keyAkhir="";
          display=0;
          }else{
            keyAkhir = keyAkhir + key;
            }
      }

  if(display==1){
    if (keyAkhir == password) {
      digitalWrite(ledBenar,HIGH);
      oled.clearDisplay();
      oled.setTextSize(1);
      oled.setTextColor(WHITE);
      oled.setCursor(0,0);
      oled.println("Password Benar");
      oled.setCursor(0,10);
      oled.println("Led: Hijau");
      oled.display(); 
    
    } else {
      digitalWrite(ledSalah,HIGH);
      oled.clearDisplay();
      oled.setTextSize(1);
      oled.setTextColor(WHITE);
      oled.setCursor(0,0);
      oled.println("Password Salah");
      oled.setCursor(0,10);
      oled.println("Led: Merah");
      oled.display(); 
      key = keypad.getKey();
    }
  }
}
}