HID Wiegand RFID Reader Support

The Kegboard firmware supports reading many popular HID RFID cards via an attached Wiegand reader.

Hardware Needed

You need an external RFID reader that:

• Uses the 2-wire Wiegand protocol
• Operates at +5v DC (ie the same voltage as the Kegboard).

Here's one example from Amazon. The OmniProx OP40 is also known to work (confirm voltage first); it's usually easy to find these used for $20 or so on eBay.

Enabling the Firmware

The Wiegand reader feature is not enabled by default, since it requires pins that are already allocated to the legacy Kegboard RFID reader.

Patch the kegboard_config.h file to enable the Wiegand reader feature. You'll have to disable the ID-12 feature at the same time:

// Enable ID-12 RFID?
#define KB_ENABLE_ID12_RFID 0

// Enable Wiegand RFID reader?
// Note: Must set KB_ENABLE_ID12_RFID to 0 if enabling this.
#define KB_ENABLE_WIEGAND_RFID 1

Optionally, change the pins used by the firmware:

#define KB_PIN_WIEGAND_RFID_DATA0 A4
#define KB_PIN_WIEGAND_RFID_DATA1 A5

Rebuild and flash the firmware.

Wiring the Reader

There are 4 wires we care about. The reader may have more than four wires; consult the datasheet for the reader if in doubt (OP40 datasheet).

• PWR or DC+ Input should be connected to the 5v power supply.
• GND should in turn be connected to ground.
• DATA0 connects to the pin you configured as KB_PIN_WIEGAND_RFID_DATA0.
• DATA1 connects to the pin you configured as KB_PIN_WIEGAND_RFID_DATA1.