am i wiring this up correctly. i assume im not as its not working how it is intended to work. the code is on the attiny and the led should light up when i press the button and transmit a signal over the coil. but when press the button nothing happens. please help me its for a college project (im demoing a magspoof)
This is my code that i was kindly helped with on here and i changed the pin outs to work with attiny (i think i did it right)
/*
MagSpoof - "wireless" magnetic stripe/credit card emulator
by Samy Kamkar
http://samy.pl/magspoof/
- Allows you to store all of your credit cards and magstripes in one device
- Works on traditional magstripe readers wirelessly (no NFC/RFID required)
- Can disable Chip-and-PIN (code not included)
- Correctly predicts Amex credit card numbers + expirations from previous card number (code not included)
- Supports all three magnetic stripe tracks, and even supports Track 1+2 simultaneously
- Easy to build using Arduino or ATtiny
*/
#include <avr/sleep.h>
const byte PIN_A = 0;
const byte PIN_B = 1;
const byte ENABLE_PIN = 3; // also green LED
const byte SWAP_PIN = 4; // unused
const byte BUTTON_PIN = 2;
const unsigned CLOCK_US = 200;
const int BETWEEN_ZERO = 53; // 53 zeros between track1 & 2
const int TRACKS = 2;
// consts get stored in flash as we don't adjust them
const char* tracks[] =
{
"%B123456781234567^LASTNAME/FIRST^YYMMSSSDDDDDDDDDDDDDDDDDDDDDDDDD?\0", // Track 1
";123456781234567=YYMMSSSDDDDDDDDDDDDDD?\0" // Track 2
};
char revTrack[41];
const int sublen[] =
{
32, 48, 48
};
const int bitlen[] =
{
7, 5, 5
};
unsigned int curTrack = 0;
int dir;
void setup()
{
pinMode(PIN_A, OUTPUT);
pinMode(PIN_B, OUTPUT);
pinMode(ENABLE_PIN, OUTPUT);
pinMode(BUTTON_PIN, INPUT_PULLUP);
// blink to show we started up
blink(ENABLE_PIN, 200, 3);
// store reverse track 2 to play later
storeRevTrack(2);
}
void blink(int pin, int msdelay, int times)
{
for (int i = 0; i < times; i++)
{
digitalWrite(pin, HIGH);
delay(msdelay);
digitalWrite(pin, LOW);
delay(msdelay);
}
}
// send a single bit out
void playBit(int sendBit)
{
dir ^= 1;
digitalWrite(PIN_A, dir);
digitalWrite(PIN_B, !dir);
delayMicroseconds(CLOCK_US);
if (sendBit)
{
dir ^= 1;
digitalWrite(PIN_A, dir);
digitalWrite(PIN_B, !dir);
}
delayMicroseconds(CLOCK_US);
}
// when reversing
void reverseTrack(int track)
{
int i = 0;
track--; // index 0
dir = 0;
while (revTrack[i++] != '\0');
i--;
while (i--)
for (int j = bitlen[track] - 1; j >= 0; j--)
playBit((revTrack[i] >> j) & 1);
}
// plays out a full track, calculating CRCs and LRC
void playTrack(int track)
{
int tmp, crc, lrc = 0;
track--; // index 0
dir = 0;
// enable H-bridge and LED
digitalWrite(ENABLE_PIN, HIGH);
// First put out a bunch of leading zeros.
for (int i = 0; i < 25; i++)
playBit(0);
//
for (int i = 0; tracks[track][i] != '\0'; i++)
{
crc = 1;
tmp = tracks[track][i] - sublen[track];
for (int j = 0; j < bitlen[track] - 1; j++)
{
crc ^= tmp & 1;
lrc ^= (tmp & 1) << j;
playBit(tmp & 1);
tmp >>= 1;
}
playBit(crc);
}
// finish calculating and send last "byte" (LRC)
tmp = lrc;
crc = 1;
for (int j = 0; j < bitlen[track] - 1; j++)
{
crc ^= tmp & 1;
playBit(tmp & 1);
tmp >>= 1;
}
playBit(crc);
// if track 1, play 2nd track in reverse (like swiping back?)
if (track == 0)
{
// if track 1, also play track 2 in reverse
// zeros in between
for (int i = 0; i < BETWEEN_ZERO; i++)
playBit(0);
// send second track in reverse
reverseTrack(2);
}
// finish with 0's
for (int i = 0; i < 5 * 5; i++)
playBit(0);
digitalWrite(PIN_A, LOW);
digitalWrite(PIN_B, LOW);
digitalWrite(ENABLE_PIN, LOW);
}
// stores track for reverse usage later
void storeRevTrack(int track)
{
int i, tmp, crc, lrc = 0;
track--; // index 0
dir = 0;
for (i = 0; tracks[track][i] != '\0'; i++)
{
crc = 1;
tmp = tracks[track][i] - sublen[track];
for (int j = 0; j < bitlen[track] - 1; j++)
{
crc ^= tmp & 1;
lrc ^= (tmp & 1) << j;
tmp & 1 ?
(revTrack[i] |= 1 << j) :
(revTrack[i] &= ~(1 << j));
tmp >>= 1;
}
crc ?
(revTrack[i] |= 1 << 4) :
(revTrack[i] &= ~(1 << 4));
}
// finish calculating and send last "byte" (LRC)
tmp = lrc;
crc = 1;
for (int j = 0; j < bitlen[track] - 1; j++)
{
crc ^= tmp & 1;
tmp & 1 ?
(revTrack[i] |= 1 << j) :
(revTrack[i] &= ~(1 << j));
tmp >>= 1;
}
crc ?
(revTrack[i] |= 1 << 4) :
(revTrack[i] &= ~(1 << 4));
i++;
revTrack[i] = '\0';
}
void sleep()
{
set_sleep_mode(SLEEP_MODE_PWR_DOWN); // replaces above statement
sleep_enable(); // Sets the Sleep Enable bit in the MCUCR Register (SE BIT)
sei(); // Enable interrupts
sleep_cpu(); // sleep
cli(); // Disable interrupts
sleep_disable(); // Clear SE bit
sei(); // Enable interrupts
}
void loop()
{
sleep();
noInterrupts();
while (digitalRead(BUTTON_PIN) == LOW);
delay(50);
while (digitalRead(BUTTON_PIN) == LOW);
playTrack(1 + (curTrack++ % 2));
delay(400);
interrupts();
}
