Colin Bookman
A library to read HID RFID cards through the wiegand protocol. This was tested with the HID ProxPoint Plus 6005BG00.
Dependents: HID_ProxCard_Wiegand_Example
Wiegand Library for HID ProxPoint Plus
While this library should be able to read any wiegand input, the buffer can only store 64 bits, and it expects there to be less than a 5ms delay between each bit sent.
Here is a picture of some example wiring:
To use this library use the following pin attachments, the 6005BG00 has its pinouts on its back label (top right).
| 6005BG00 Wire | MBED PIN |
|---|---|
| data0 | p30 |
| data1 | p29 |
| hold | p28 |
| GND | GND |
| DRAIN | GND |
| 5-16V (red) | Vu |
Here is a picuture of it wired up:
include the mbed library with this snippet
void void onCardRead();
Wiegand rfid(p30, p29, p28, &onCardRead);
int main() {
while(1) {
rfid.doEvents(); //checks if data has been fully read, and calls the callback
}
}
void onCardRead() {
/*
Do stuff with data, as we've fully read the card.
WHen this function exits, RFID reader will be reset to read
Another Card
*/
//returns the unique student identifier on a buzzcard (6 digit number on back of buzzcard below gatech seal)
uint64_t rawCardData = rfid.getBits(14,33);
}
Description of public methods
| method | description |
|---|---|
| Wiegand(PinName pdata0, PinName pdata1, PinName pHold, void (*onCardRead)()); | constructor, call WIegand wiegand (...) |
| void doEvents(void) | checks if all RFID data has been read though the use of a timer, and calls the onCardRead callback |
| uint8_t bitsRead(void) | returns the number of bits read |
| uint64_t getBits(uint8_t start, uint8_t end) | Returns the bits read from in [start,end] (Inclusive). If its an invalid range, returns 0 |
Example Program
Import programHID_ProxCard_Wiegand_Example
Example program to read HID ProxCards using the gatech BuzzCard format with a HID ProxPoint Plus 6005BG00.
Last commit 23 Apr 2014 by 
Colin Bookman
Here is a video of the example program in action:
ProxPoint Plus 6005BG00 Oscilloscope Capture
Gatech BuzzCard Protocol
The rfid buzzcard unique student identifier can be found on the back of your buzzcard below the shiny gatech seal (6 digit number). Each buzzcard's rfid tag stores 35 bits of data, but only bits [14,33] contain your id (bit index starts at 0, and range is inclusive).