Outputting Wiegand data to a wiegand decoding device

Projects General Guidance
1

Hi Guys and Girls

I have had a good hunt about, and I see plenty of articles on how to READ wiegand data from a reader, but my project idea is to output wiegand data into a device that reads the string and decodes it.

The project is basicaly to test the ability of my less experienced staff how to decode a preset (or a number of preset) string(s) on our systems so that they get it right.

My ultimate goal is to have an Arduino board set up with a number of buttons so when pressed a wiegand string will be sent out to the device and they need to then come up with a decoding matrix that interprets the data correctly.

I would like to have a variety of wiegand formats available. 26, 34, 40 and if I can 96.

It's a tall order, but it would be great to have for training purposes.

Unfortunately I can't go into details exactly what this is for, but the result would be made fully available. Rest assured, this is not for anything even remotely shady.

2

Wiegand is easy. For each bit, if the bit is 0, pulse the '0' pin low, else pulse the '1' pin low.

I would store the string as a byte array starting with the Most Significant Bit of the Most Significant Byte. Something like this:

void OutputWiegand(byte string[], byte length)
{
  for (byte i = 0; i < length; i++)
  {
    byte byteIndex = i / 8;  // Bytes from start of string
    byte bitIndex = i % 8;  // Bits from high order bit
    boolean bit = (string[byteIndex] << bitIndex) & 0x80;
    digitalWrite(bit ? OnePin : ZeroPin, LOW);
    delayMicroseconds(50);
    digitalWrite(bit ? OnePin : ZeroPin, HIGH);
    delay(2);
  }
}