int RFIDResetPin = 13;
#define led 12
#define przekaznik 7

char tag1[13] = "00782AF08220";
char tag2[13] = "0B0068956D9B";
char tag3[13] = "TU WPISZCIE TRZECIEGO TAGA";
char tagString[13];
boolean first = false, second = false, third = false;


void setup()
{
  pinMode(przekaznik, OUTPUT);
  digitalWrite(przekaznik, HIGH);
  pinMode(RFIDResetPin, OUTPUT);
  digitalWrite(RFIDResetPin, HIGH);
  pinMode(led, OUTPUT);
  digitalWrite(led,LOW);
  Serial.begin (9600);
}

void loop() {
  int index = 0;
  boolean reading = false;

  while(Serial.available())
  {
    int readByte = Serial.read(); //read next available byte

    if(readByte == 2) reading = true; //begining of tag
    if(readByte == 3) reading = false; //end of tag

    if(reading && readByte != 2 && readByte != 10 && readByte != 13)
    {
      tagString[index] = readByte;
      index ++;
    }
  }

  checkTag(tagString);
  clearTag(); //Clear the char of all value

  if(first == true && second == true && third == true)
  {
    digitalWrite(led, LOW);
    delay(500);
    digitalWrite(led, HIGH);
    wlacz_przekaznik();
    first = false;
    second = false;
    third = false;
  }
  resetReader();
}

void checkTag(char tag[])
{
  if(strlen(tag) == 0) return; //empty, no need to contunue
  if(compareTag(tag, tag1) first = true;
  if(first == true) if(compareTag(tag, tag2) second = true;
  if(second == true) if(compareTag(tag, tag3) third = true;
}

void lightLED(int pin)
{
///////////////////////////////////
//Turn on LED on pin "pin" for 250ms
///////////////////////////////////
  Serial.println(pin);

  digitalWrite(led, HIGH);
  delay(250);
  digitalWrite(led, LOW);
}

void resetReader()
{
///////////////////////////////////
//Reset the RFID reader to read again.
///////////////////////////////////
  digitalWrite(RFIDResetPin, LOW);
  digitalWrite(RFIDResetPin, HIGH);
  delay(1500);
}

void clearTag()
{
  for(int i = 0; i < strlen(tagString); i++)
  {
    tagString[i] = 0;
  }
}

boolean compareTag(char one[], char two[])
{
  if(strlen(one) == 0) return false; //empty

  for(int i = 0; i < 12; i++){
    if(one[i] != two[i]) return false;
  }

  return true; //no mismatches
}

void wlacz_przekaznik()
{
 digitalWrite(przekaznik,LOW);
 delay(15000);
 digitalWrite(przekaznik,HIGH);
}