#include <Keypad.h>

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

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

byte rowPins[ROWS] = {10, 9, 8, 7};
byte colPins[COLS] = {6, 5, 4, 3};

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

String customKey;
char keyPressed;

void setup() {
  Serial.begin(9600);
  Serial.println("\n\n\nCodeschloss is ready.");
  pinMode(2, INPUT);//Draht am Safe
  pinMode(11, OUTPUT);
  while(digitalRead(2) == 0){
    delay(1);
  }
  Serial.println("Pin:");
}

void loop() {
  if(digitalRead(2)==LOW){
    customKey="";
    Serial.println("Alarm! Pin reset.");
    digitalWrite(11, HIGH);
    delay(1000);
    digitalWrite(11, LOW);
    delay(1000);
  }
  keyPressed = customKeypad.getKey();
  //Serial.println( keyPressed);
  if(keyPressed){
    Serial.println("keypressed:"+ String(keyPressed));
    if(String(keyPressed) == "C"){
      customKey = "";
      Serial.println("Clear");
    }else{
      customKey = customKey + keyPressed;
      Serial.println("Pin:"+customKey);
    }
    
    if(customKey=="2554"){
      Serial.println("Unlocked! Hurry up to open, one second left.");
      delay(1000);
      Serial.println("Unlocked untill reconect");
      customKey = "";
      while(digitalRead(2) == LOW){
        delay(10);
    }
    Serial.println("Locked!");
    //Serial.println(customKey + keyPressed);
  }
  }
  delay(10);
}