#include <Arduino.h>

const int ledPin = 13;
const int buzzerPin = 12;
const int buttonPin = 2;

const int correctPIN = 1234;

void setup() {
  pinMode(ledPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);
  pinMode(buttonPin, INPUT_PULLUP);
}

void loop() {
  int enteredPIN = 0;
  int buttonState;

buttonState = digitalRead(buttonPin);


if (buttonState == LOW) {
  delay(100);
while (buttonState == LOW);
buttonState = digitalRead(buttonPin);
}

for (int i = 0; i < 4; i++) {
  enteredPIN = enteredPIN * 10 + (digitalRead(buttonPin));
  delay(300);
}


if (enteredPIN == correctPIN) {
  digitalWrite(ledPin, HIGH);
  digitalWrite(buzzerPin, LOW);
  delay(1000);
  digitalWrite(ledPin, LOW);
} else {
  for (int i = 0; i < 3; i++) {
   digitalWrite(ledPin, HIGH);
   digitalWrite(buzzerPin, HIGH);
   delay(300);
   digitalWrite(ledPin, LOW);
   digitalWrite(buzzerPin, LOW);
   delay(300);
  }
}
}