#include <Keypad.h>

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

byte rowPins[ROWS] = {2, 3, 4, 5}; 
byte colPins[COLS] = {6, 7, 8, 9}; 

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

String inputPassword = "";
String correctPassword = "1234";

const int ledGreen = 12;
const int ledRed = 11;
const int buzzerPin = 10;

void setup() {
  Serial.begin(9600);
  pinMode(ledGreen, OUTPUT);
  pinMode(ledRed, OUTPUT);
  pinMode(buzzerPin, OUTPUT);
  digitalWrite(ledGreen, LOW);
  digitalWrite(ledRed, LOW);
  digitalWrite(buzzerPin, LOW);
}

void loop() {
  char key = keypad.getKey();
  if (key) {
    Serial.print("Pressed: ");
    Serial.println(key);

    if (key == '#') { // Tombol ENTER
      if (inputPassword == correctPassword) {
        Serial.println("Access Granted");
        digitalWrite(ledGreen, HIGH);
        digitalWrite(ledRed, LOW);
        tone(buzzerPin, 1000, 500); // bunyi 500ms
      } else {
        Serial.println("Access Denied");
        digitalWrite(ledRed, HIGH);
        digitalWrite(ledGreen, LOW);
        tone(buzzerPin, 500, 1000); // bunyi 1000ms
      }
      delay(2000);
      digitalWrite(ledGreen, LOW);
      digitalWrite(ledRed, LOW);
      noTone(buzzerPin);
      inputPassword = ""; // reset password
    } else if (key == '*') { // RESET input password
      inputPassword = "";
      Serial.println("Input Cleared");
      noTone(buzzerPin); // stop buzzer (jika masih bunyi)
    } else {
      inputPassword += key;
    }
  }
}