#include <SPI.h>
#include <MFRC522.h>

 /** -----------------------------------------------------------------------------------------
 *             MFRC522      Arduino       Arduino   Arduino    Arduino          Arduino
 *             Reader/PCD   Uno/101       Mega      Nano v3    Leonardo/Micro   Pro Micro
 * Signal      Pin          Pin           Pin       Pin        Pin              Pin
 * -----------------------------------------------------------------------------------------
 * RST/Reset   RST          9             5         D9         RESET/ICSP-5     RST
 * SPI SS      SDA(SS)      10            53        D10        10               10
 * SPI MOSI    MOSI         11 / ICSP-4   51        D11        ICSP-4           16
 * SPI MISO    MISO         12 / ICSP-1   50        D12        ICSP-1           14
 * SPI SCK     SCK          13 / ICSP-3   52        D13        ICSP-3           15*/


#define RST_PIN         9          
#define SDA_PIN          10        

#define GREEN   6
#define RED    5
#define BLUE    7

MFRC522 rf(SDA_PIN, RST_PIN); 

byte dovolene[] = {0x93, 0x99, 0xAF, 0xAA}; 

void setup() {
  Serial.begin(9600);		
  SPI.begin();			
  rf.PCD_Init();		
  delay(4);				
  rf.PCD_DumpVersionToSerial();	
  Serial.println(F("Naskenuj kartu"));
  
  for (int i = 5; i < 8; i++) {
    pinMode(i, OUTPUT);
    digitalWrite(i, LOW);
  }
}

void loop() {
  if (!rf.PICC_IsNewCardPresent()) { 
    return;
  }

  if (!rf.PICC_ReadCardSerial()) {
    return;
  }

  byte* cislo_skenu = rf.uid.uidByte;

  if (Porovnaj(cislo_skenu, dovolene, sizeof(dovolene))) {
    Serial.println("Vstup povoleny");
    digitalWrite(GREEN, HIGH);  
    digitalWrite(RED, LOW);    
  } else {
    Serial.println("Vstup Nepovoleny");
    digitalWrite(RED, HIGH);    
    digitalWrite(GREEN, LOW);   
  }
  delay(500);


}

// Funkcia na porovnanie UID
bool Porovnaj(byte* cislo_skenu, byte* dovolene, byte dlzka_pola) {
  for (byte i = 0; i < dlzka_pola; i++) {
    if (cislo_skenu[i] != dovolene[i]) {  
      return false;  
    }
  }
  return true;  
}