The Wiegand interface is a de facto standard commonly used to connect a card reader or keypad to an electronic entry system. Wiegand interface has the ability to transmit signal over long distance with a simple 3 wires connection. This library uses interrupt pins from Arduino to read the pulses from Wiegand interface and return the code and type of the Wiegand.

The following are needed

• [Arduino] (http://www.arduino.cc) Any ATMEGA328 compatible board should work.
• [Wiegand RFID Reader] (http://www.monkeyboard.org/products/85-developmentboard/84-rfid-wiegand-protocol-development-kit) The code was written for this reader however customers reported working with [HID] (http://www.hidglobal.com/products/cards-and-credentials) compatible readers.
• DATA0 of Wiegand connects to Arduino PIN 2 and DATA1 of Wiegand connects to Arduino PIN 3

Create a folder named Wiegand in Arduino's libraries folder. You will have the following folder structure:

cd arduino/libraries
mkdir Wiegand
cd Wiegand
git clone https://github.com/monkeyboard/Wiegand-Protocol-Library-for-Arduino.git .

Execute Arduino IDE, select Example-->Wiegand-->WiegandTest

#include <Wiegand.h>

WIEGAND wg;

void setup() {
	Serial.begin(9600);  
	wg.begin();
}

void loop() {
	if(wg.available())
	{
		Serial.print("Wiegand HEX = ");
		Serial.print(wg.getCode(),HEX);
		Serial.print(", DECIMAL = ");
		Serial.print(wg.getCode());
		Serial.print(", Type W");
		Serial.println(wg.getWiegandType());    
	}
}

Written by JP Liew

Project home: http://www.monkeyboard.org/tutorials/82-protocol/24-wiegand-converter

This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.