// RFID reader for Arduino 
// Wiring version by BARRAGAN <http://people.interaction-ivrea.it/h.barragan> 
// Modified for Arudino by djmatic
//    Arduino RX to RFID TX
//    Arduino GND to RFID GND
//    Arduino Digital pin 2 to RFID enable
//    Arduino +5V to RFID Vcc pin. 

int flag = 0;
int  val = 0; 
char code[10]; 
int bytesread = 0; 

int rfidPin = 2;

void setup() { 

Serial.begin(9600); // RFID reader SOUT pin connected to Serial RX pin at 2400bps 

}  

void rfidInit(){
 pinMode(rfidPin,OUTPUT); // Set digital pin 2 as OUTPUT to connect it to the RFID /ENABLE pin 
 digitalWrite(rfidPin,LOW); // Activate the RFID reader 
}

void readRfid(){
  if(Serial.available() > 0) {          // if data available from reader 
    if((val = Serial.read()) == 10) {   // check for header 
      bytesread = 0; 
      while(bytesread<10) {              // read 10 digit code 
        if( Serial.available() > 0) { 
          val = Serial.read(); 
          if((val == 10)||(val == 13)) { // if header or stop bytes before the 10 digit reading 
            break;                       // stop reading 
          } 
          code[bytesread] = val;         // add the digit           
          bytesread++;                   // ready to read next digit  
        } 
      } 
      if(bytesread == 10) {              // if 10 digit read is complete 
        Serial.print("TAG code is: ");   // possibly a good TAG 
        Serial.println(code);            // print the TAG code 
      } 
      bytesread = 0; 
      digitalWrite(2, HIGH);                  // deactivate the RFID reader for a moment so it will not flood
           delay(1500);                       // wait for a bit 
           digitalWrite(2, LOW);                  // Activate the RFID reader
    } 
  }   
}

 void loop() {
  if(flag==0){
    rfidInit();
    flag = 1;
  }
  else{
    readRfid();
  }
  
} 

// extra stuff
// digitalWrite(2, HIGH);             // deactivate RFID reader