Hello Everyone,
Read Track 1 & Track 2 cards on MAgStripe (Refer Magstrip.png) simultaneously on Arduino Mega 2560.
I found a library where a person had already programmed this sort of project on Arduino, but only for Single Track Reading - Google Code Archive - Long-term storage for Google Code Project Hosting. , So i wanted to take it further by reading TRACK 1 and TRACK2 ...
I altered the library to read an additional track with 2 more interrupts
/---- Library Code------/
Please attached file - Magstripe_final.cpp
/----Library Header----/
#ifndef MAGSTRIPE_H
#define MAGSTRIPE_H
#if ARDUINO < 100
# include <WProgram.h>
#else
# include <Arduino.h>
#endif
//#include "../PinChangeInt/PinChangeInt.h"
// The data and clock pins depend on the board model...
#if defined(__AVR_ATmega32U4__)
// Arduino Leonardo and Arduino Micro:
# define MAGSTRIPE_RDT 3 /* data pin (blue) */
# define MAGSTRIPE_RCL 2 /* clock pin (green) */
#else
// Arduino Uno and Arduino Mega:
# define MAGSTRIPE_RDT1 2 /* data pin (White) */
# define MAGSTRIPE_RCL1 3 /* clock pin (Yellow) */
# define MAGSTRIPE_RDT2 21 /* data pin (Orange) */
# define MAGSTRIPE_RCL2 20 /* clock pin (Brown) */
#endif
#define MAGSTRIPE_CLS 4 /* card present pin (Green) */
// Cards can be read in one of these possible ways...
enum ReadDirection { READ_UNKNOWN, READ_FORWARD, READ_BACKWARD };
class MagStripe {
public:
// The CLS pin can be changed from the default...
MagStripe(unsigned char cls=MAGSTRIPE_CLS);
// Initialize the library (attach interrupts)...
void begin1(unsigned char track1);
void begin2(unsigned char track2);
// Deinitialize the library (detach interrupts)...
void stop();
// Check if there is a card present for reading...
bool available();
// Read the data from the card as ASCII...
short read1(char *data, unsigned char size);
short read2(char *data, unsigned char size);
// The direction of the last card read...
enum ReadDirection read_direction();
private:
unsigned char pin_cls;
unsigned char track1;
unsigned char track2;
enum ReadDirection direction;
void reverse_bits1();
void reverse_bits2();
bool verify_parity(unsigned char c);
bool verify_lrc1(short start, short length);
bool verify_lrc2(short start, short length);
short find_sentinel1(unsigned char pattern);
short find_sentinel2(unsigned char pattern);
short decode_bits1(char *data, unsigned char size);
short decode_bits2(char *data, unsigned char size);
};
#endif /* MAGSTRIPE_H */
/------ INO TRACK READER-----/
#include <MagStripe_final.h>
// Visual feedback when the card is being read...
static const byte READ_LED = 13;
static const byte ERROR_LED = 12;
MagStripe card;
static const byte DATA_BUFFER_LEN = 108;
char data1[DATA_BUFFER_LEN];
char data2[DATA_BUFFER_LEN];
void setup()
{
pinMode(READ_LED, OUTPUT);
pinMode(ERROR_LED, OUTPUT);
// The card data will be sent over serial...
Serial.begin(9600);
// Initialize the library for reading track 2...
card.begin1(1);
card.begin2(2);
// Start with the feedback LEDs off...
digitalWrite(READ_LED, LOW);
digitalWrite(ERROR_LED, LOW);
}
void loop()
{
// Don't do anything if there isn't a card present...
if (!card.available()) {
return;
}
// Show that a card is being read...
// digitalWrite(READ_LED, HIGH);
{
char data1[DATA_BUFFER_LEN];
char data2[DATA_BUFFER_LEN]; short aux=0;
while(aux < DATA_BUFFER_LEN)
{
data1[aux]=data2[aux]=0x00;
aux++;
}
// Read the card into the buffer "data" (as a null-terminated string)...
short chars1 = card.read1(data1, DATA_BUFFER_LEN);
short chars2 = card.read2(data2, DATA_BUFFER_LEN);
// Show that the card has finished reading...
// digitalWrite(READ_LED, LOW);
// Send the data to the computer...
Serial.println(data1);
Serial.println(chars1, DEC);
Serial.println();
Serial.println(data2);
Serial.println(chars2, DEC);
}
}
**Current Problems **
1. There is only one PIN present which can say CARD PRESENT (5 - gREEN), But cannot identify which Card was it? TRack 1 Or Track 2? If I use card.available() it will read the same value as it belongs to same pin....
2. When only Reading Track 1 Or Track 2 cards (Individually) on Pin 2 (data) & Pin 3 (clock) Or Pin 21 & Pin 20 (As interrupts are attached on these pins as per -- attachInterrupt() - Arduino Reference ) works fine...
But when if all the pins are connected
White - Pin 2 - DAta - Track 1
Yellow - pin 3 - Clock - Track 1
Orange - Pin 21 - Data - Track 2
Brown - Pin 20 - Clock - Track 2
Green - Pin 4 - CARD PRESENT
Ground + 5V
The Following Test case was tested, but results where not in the right way
--- Swipe a Track 1 card --- Displays data (chars1 = 60) , while displays chars2= -1 for Track2 card
--- Swipe a Track 2 card --- Displays NULL data with -1 (chars 1 and chars 2)
--- Swipe a DUAL Track card -- Displays data in Track 1 (chars = 78) , while displays chars2 = -1 for track2 data --- The card contains both the track data
Or I have set the interrupt in a wrong way for TRAck 2 or TRack 1?
Basic Problem is the interrupt routine or something not sending the right stuff...
MagStripe_final.cpp (11.7 KB)