The file that is currently on an Arduino Mega 2560 or Mega ADK with a serial number of CC2B6802ERDG6ML0

RFIDtest.ino

#include <avr/pgmspace.h>


#define TAG_LEN 12 // length of a single tag in bytes


int ledPin = 13; //feedback led
int ledPin2 = 6; //feedback led
int checkrfid = 0; // after a scan for tags, this will become:  0 if no tag was read, 1 if tag is recognized, 2 if tag is not recognized,
byte code[TAG_LEN]; // var that will hold the bytes-in read from the serialBuffer
int bytes_read = 0; // number of bytes read
PROGMEM prog_char target_tag[][TAG_LEN] = //dynamic multidimensional array with known tags. It's stored into flash memory to overcome the 70 tag limit.
{{0x00, 0x00, 0xdd, 0x8e, 0x96, 0x0e, 0x00, 0x01, 0x04, 0xe0, 0x10, 0xc8 },
{0x00,  0x00, 0x1b, 0x4e, 0xc1, 0x0d, 0x00, 0x01, 0x04, 0xe0, 0xd5, 0x7b}};

void setup()  {
  // define pin modes for tx, rx, led pins:
  pinMode(ledPin, OUTPUT); // setup for feedback led
  pinMode(ledPin2, OUTPUT); // setup for feedback led
  Serial.begin(19200);	// opens serial port, sets data rate to 19200 bps
  Serial3.begin(19200);

}

void loop ()
{
scan(); // do a scan for tags
if(checkrfid == 1) // if tag is recognized
{
  fade(); //do function "fade" (see below)
  delay(100);
}
if(checkrfid == 2) // if tag is not recognized
{
  blink(); //do function "blink" (see below)
}
delay(100); //wait before doing a new scan
}



void scan () {

  checkrfid = 0; //set "state of recogniton" back to zero
  Serial3.write(0xfa);
  //mySerial.print(0xfa, BYTE); //request Tag code

  if(Serial3.available()){ //if data is coming back from the reader
     while (Serial3.available() && bytes_read < TAG_LEN){ //while data is coming back from the reader and not all 12 bytes are read
     code[bytes_read] = Serial3.read(); //add byte
     bytes_read++;  // update number of bytes read
     }
  }

  Serial.println ("NO TAG "); //No data has come from the reader so "No Tag" is displayed


  if( bytes_read >= TAG_LEN) //if 12 bytes were read, print them out
  {

	Serial.print("{"); //adds syntax so you can just copy-paste the tag into your code
	for(int i=0; i<bytes_read; i++) //prints all 12 bytes one at a time
	{
	    Serial.print("0x"); //more syntax for copy-paste
		Serial.print(code[i], HEX);    //print out the byte in HEX
		Serial.print(", "); //more syntax for copy-paste
	}
	Serial.print("},"); //more syntax for copy-paste



	 for(int i = 0; i < ((sizeof(target_tag))/12); i++) //tag is compared to array of known tags, note that the size of the array is dynamic and calculated every time, more ease for copy-paste...
	{
	  if(memcmp_P(code, target_tag[i], TAG_LEN) == 0 ) //uses the PROGMEM variant of memcmp -> memcmp_P This function doesn't work with the standard Arduino 009 IDE, Needs avr-libc 1.4.6.
	  {
		checkrfid = 1; //if tag matches, set "checkrfid" to 1
	  }

	}
	if(checkrfid == 0) //if tag doesn't match, set "checkrfid" to 2
	{
	  checkrfid = 2;
	}
	Serial.flush(); //flush serial buffer
     }

    Serial.println(); //print linefeed
    bytes_read = 0; //set number of bytes read back to zero
  }

void blink ()
{
  digitalWrite(ledPin, HIGH); // if true blink led
  delay(1000);
  digitalWrite(ledPin, LOW);
  delay(500);
}

void fade ()
{

 int value = 0;
  for(value = 0 ; value <= 255; value+=5) // fade in (from min to max)
  {
    analogWrite(ledPin2, value);	     // sets the value (range from 0 to 255)
    delay(30);				    // waits for 30 milli seconds to see the dimming effect
  }
  delay(200);
  for(value = 255; value >=0; value-=5)   // fade out (from max to min)
  {
    analogWrite(ledPin2, value);
    delay(30);
  }
 delay(500);

 }