Hi,
I just received the 125Kz RFID reader with Wiegand interface. (compliments on the service ! 
)
The example code provided doesn’t produce sensible output on my Seeduino v328, therefore I created my own sketch (attached at bottom of this post).
I get 5 different codes for my 5 tags (3 keyrings + 2 cards) which is fine, however the codes read do not match the codes printed on the keyrings.
Now the main question is: should the codes read match the printed codes ?
E.g. skipping the parity bits at the front and back one of my tokens returns:
011000001110001101100110
Looking at the data sheet it seems that this should be interpreted as the last 3 bytes of a 4 byte long value.
(translation of the datasheet could be improved though 
)
As a long the bit sequence produces 6349670
The example code provided produces 4 decimals (although the latter is always 0 !)
Reading the bit string as 3 separate bytes produces: 96 227 102
The code on the keyring however is 0010427545.
If the codes read via RFID should match the printed codes then I am very curious what kind of coding is being used !!
Kind regards,
Hans
// RFID Wiegand interface v3
// J. Klunder , September 3, 2009
// which ports to use
int data0 = 8;
int data1 = 9;
long card_num=0;
int bitnum;
boolean processBit(int d1){
switch (bitnum) {
case 0: // parity even
break;
case 25: // parity odd + ready
bitnum=0;
return(true);
break;
default:
if (d1 == 0){
bitSet(card_num,24-bitnum);
}
break;
}
bitnum++;
return(false);
}
void setup(){
Serial.begin(9600);
pinMode(data0 , INPUT);
pinMode(data1 , INPUT);
bitnum=0;
}
void loop(){
int d0 = digitalRead(data0);
int d1 = digitalRead(data1);
if (d0 != d1){
// we got signal ;-)
if (processBit(d1)){
// we got a complete sequence
Serial.println(card_num,DEC);
card_num=0; //reset card_number
}
delayMicroseconds(80); // Data impulse width delay 80us
}
}