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#include <SoftwareSerial.h> 
SoftwareSerial mySerial(8, 9); //pin2 Rx, pin3 Tx 

int CMD[64];
int comlen =0;
int out_flag =0;
String result = String('75 50 FD 2D'  ,DEC);
int resulting = '7550FD2D';
//byte C;



void setup() 
{ 
  Serial.begin(9600);
  mySerial.listen();
  Serial.println("Serial number will be displayed here if a card is detected by the module:\n"); 
  // set the data rate for the SoftwareSerial port 
  mySerial.begin(9600); 
  delay(10);
  mySerial.write(0x02); //Send the command to RFID, please refer to RFID manual 
} 
void loop() // run over and over 
{ 

  while (Serial.available()) 
  {
    int a = SerialReadHexDigit();
    //Serial.println(a);
    if(a>=0){
      CMD[comlen] = a;
      comlen++;
    }
    delay(10);
  }

  for(int i=0; i<comlen; i+=2){
    int c = mySerial.write( CMD[i]*16 + CMD[i+1]);
  }
  comlen =0;

  byte C;
  while (mySerial.available()) {
    C = mySerial.read();


    if (C<16) Serial.print("0");
    Serial.print(C ,HEX); //Display the Serial Number in HEX 
    //Serial.print(" ");



    out_flag =1;

/////////// MY ADDITION /////////////////////////////

    if(Serial.available())
    {
      Serial.print("GOT: ");
      Serial.println(C);
      C = Serial.read();
      if (C == resulting){

        Serial.println("IM IN");
      }
    }

//////////////////////////////////////////////////
  }

  if (out_flag >0) {
    Serial.println();
    out_flag = 0;
  }

}



int SerialReadHexDigit()
{
  byte c = (byte) Serial.read();
  if (c >= '0' && c <= '9') {
    return c - '0';
  } 
  else if (c >= 'a' && c <= 'f') {
    return c - 'a' + 10;
  } 
  else if (c >= 'A' && c <= 'F') {
    return c - 'A' + 10;
  } 
  else {
    return -1;   // getting here is bad: it means the character was invalid
  }
}