Mengakses HID RFID Reader DT 5506 EM Output Wiegand 26 bit Menggunakan Arduino

Mengakses HID RFID Reader DT 5506 EM Output Wiegand 26 bit Menggunakan Arduino

         Pada kesempatan kali ini saya akan menjelaskan mengenai bagaimana cara mengakses sebuah RFID Reader HID tipe DT 5506 EM menggunakan mikrokontroller Arduino, alat ini digunakan untuk membaca tag card / kartu sehingga bisa teridentifikasi ID-nya di komputer, alat ini sangat cocok untuk pengaman pintu rumah atau kantor, buka-tutup palang pintu / pagar, mesin absensi dan lain-lain. yang perlu diperhatikan yaitu output dari RFID reader ini adalah wiegand 26 bit sehingga harus terlebih dahulu diolah datanya sehingga menjadi sebuah code atau ID unix. untuk program dan skema seperti penjelasan dibawah ini.

a. Arduino Uno

b. HID RFID Reader DT 5506 EM

c. Program Arduino IDE

//sumber: http://www.pagemac.com/projects/rfid/arduino_wiegand

#define MAX_BITS 100                 // max number of bits
#define WEIGAND_WAIT_TIME  3000      // time to wait for another weigand pulse. 

unsigned char databits[MAX_BITS];    // stores all of the data bits
unsigned char bitCount;              // number of bits currently captured
unsigned char flagDone;              // goes low when data is currently being captured
unsigned int weigand_counter;        // countdown until we assume there are no more bits

unsigned long facilityCode=0;        // decoded facility code
unsigned long cardCode=0;            // decoded card code

// interrupt that happens when INTO goes low (0 bit)
void ISR_INT0()
{
  //Serial.print("0");   // uncomment this line to display raw binary
  bitCount++;
  flagDone = 0;
  weigand_counter = WEIGAND_WAIT_TIME; 
 
}

// interrupt that happens when INT1 goes low (1 bit)
void ISR_INT1()
{
  //Serial.print("1");   // uncomment this line to display raw binary
  databits[bitCount] = 1;
  bitCount++;
  flagDone = 0;
  weigand_counter = WEIGAND_WAIT_TIME; 
}

void setup()
{
  pinMode(13, OUTPUT);  // LED
  pinMode(2, INPUT);     // DATA0 (INT0)
  pinMode(3, INPUT);     // DATA1 (INT1)
 
  Serial.begin(9600);
  Serial.println("RFID Readers");
 
  // binds the ISR functions to the falling edge of INTO and INT1
  attachInterrupt(0, ISR_INT0, FALLING); 
  attachInterrupt(1, ISR_INT1, FALLING);
 

  weigand_counter = WEIGAND_WAIT_TIME;
}

void loop()
{
  // This waits to make sure that there have been no more data pulses before processing data
  if (!flagDone) {
    if (--weigand_counter == 0)
      flagDone = 1;   
  }
 
  // if we have bits and we the weigand counter went out
  if (bitCount > 0 && flagDone) {
    unsigned char i;
   
    Serial.print("Read ");
    Serial.print(bitCount);
    Serial.print(" bits. ");
   
    // we will decode the bits differently depending on how many bits we have
    // see www.pagemac.com/azure/data_formats.php for mor info
    if (bitCount == 35)
    {
      // 35 bit HID Corporate 1000 format
      // facility code = bits 2 to 14
      for (i=2; i<14; i++)
      {
         facilityCode <<=1;
         facilityCode |= databits[i];
      }
     
      // card code = bits 15 to 34
      for (i=14; i<34; i++)
      {
         cardCode <<=1;
         cardCode |= databits[i];
      }
     
      printBits();
    }
    else if (bitCount == 26)
    {
      // standard 26 bit format
      // facility code = bits 2 to 9
      for (i=1; i<9; i++)
      {
         facilityCode <<=1;
         facilityCode |= databits[i];
      }
     
      // card code = bits 10 to 23
      for (i=9; i<25; i++)
      {
         cardCode <<=1;
         cardCode |= databits[i];
      }
     
      printBits(); 
    }
    else {
      // you can add other formats if you want!
     Serial.println("Unable to decode.");
    }

     // cleanup and get ready for the next card
     bitCount = 0;
     facilityCode = 0;
     cardCode = 0;
     for (i=0; i<MAX_BITS; i++)
     {
       databits[i] = 0;
     }
  }
}

void printBits()
{
      // I really hope you can figure out what this function does
      Serial.print("FC = ");
      Serial.print(facilityCode);
      Serial.print(", CC = ");
      Serial.println(cardCode);
}





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