I have connected two RFID readers with UNO board. Values that I am getting are like "255255223223223223255223223223-1-1-1-1". I want it to convert to card serial no. Any Help??
I have modifed the code below to show the serial number see if it is what you need.
*
* HID RFID Reader Wiegand Interface for Arduino Uno
* Written by Daniel Smith, 2012.01.30
* www.pagemac.com
*
* This program will decode the wiegand data from a HID RFID Reader (or, theoretically,
* any other device that outputs weigand data).
* The Wiegand interface has two data lines, DATA0 and DATA1. These lines are normall held
* high at 5V. When a 0 is sent, DATA0 drops to 0V for a few us. When a 1 is sent, DATA1 drops
* to 0V for a few us. There is usually a few ms between the pulses.
*
* Your reader should have at least 4 connections (some readers have more). Connect the Red wire
* to 5V. Connect the black to ground. Connect the green wire (DATA0) to Digital Pin 2 (INT0).
* Connect the white wire (DATA1) to Digital Pin 3 (INT1). That's it!
*
* Operation is simple - each of the data lines are connected to hardware interrupt lines. When
* one drops low, an interrupt routine is called and some bits are flipped. After some time of
* of not receiving any bits, the Arduino will decode the data. I've only added the 26 bit and
* 35 bit formats, but you can easily add more.
*/
#include <SPI.h>
#include <Ethernet.h>
#include <LiquidCrystal.h>
#include <bitset.h>
#define MAX_BITS 100 // max number of bits
#define WEIGAND_WAIT_TIME 3000 // time to wait for another weigand pulse.
#define PIN_RFID_LED 13
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
unsigned long cardnum=0;
// interrupt that happens when INTO goes low (0 bit)
void ISR_INT0()
{
//Serial.print("0");
bitCount++;
flagDone = 0;
weigand_counter = WEIGAND_WAIT_TIME;
}
// interrupt that happens when INT1 goes low (1 bit)
void ISR_INT1()
{
//Serial.print("1");
databits[bitCount] = 1;
bitCount++;
flagDone = 0;
weigand_counter = WEIGAND_WAIT_TIME;
}
void setup()
{
pinMode(PIN_RFID_LED, OUTPUT);
digitalWrite(PIN_RFID_LED, HIGH);
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)
{
Serial.print("35 bit:"); // 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];
}
char binchar[24];
String bitstring;
for(i=1; i<25;i++){bitstring = bitstring + databits[i];}
//String binstring = "010111111001101111010111";
//Serial.println(bitstring);
bitstring.toCharArray(binchar, 25);
long b, k, m, n;
long len, sum = 0;
len = strlen(binchar) - 1;
for(k = 0; k <= len; k++)
{
n = (binchar[k] - '0'); // char to numeric value
//Serial.print(n);
if ((n > 1) || (n < 0))
{
puts("\n\n ERROR! BINARY has only 1 and 0!\n");
}
for(b = 1, m = len; m > k; m--)
{
// 1 2 4 8 16 32 64 ... place-values, reversed here
b *= 2;
}
// sum it up
//Serial.println(sum);
sum = sum + n * b;
//Serial.println(sum); // uncomment to show the way this works
}
cardnum=sum;
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.print(cardCode);
Serial.print(", CardNum = ");
Serial.println(cardnum);
int i=0;
// for(i=0;i<40;i++)
//{
digitalWrite(PIN_RFID_LED, LOW);
delay(200);
digitalWrite(PIN_RFID_LED, HIGH);
delay(20);
//}
}
Dear Sir
I am looking for bitset.h, would you like to tell me where I can get them
Best regards
Tony