Build Instructions

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• 1

  Step 1

  First assemble your Arduino and shields. For the shields listed, only the NFC shield has stacking connectors so it has to go in the middle with the relay shield on top. This isn't ideal because it means the NFC antenna is surrounded by the Uno and the Relays and the card is further from the antenna than it could be. However, there is enough range for this arrangement to work well enough.

• 2

  Step 2

  Now load and run the Sketch with the serial monitor in the Arduino IDE active. Hold the card you want to use as a key close to the NFC antenna for a few seconds. The NFC reader will read the ID number from the card and display it on the serial monitor, marked as "invalid". Note the ID number.
  

• 3

  Step 3

  Now edit the Sketch to add the ID number of your card to the list of valid cards.

  Edit the valid_id array declaration to replace one of the 10 digit numbers below or add more numbers as required. For example, the code below establishes two valid ID numbers. 123456790 and 0987654321.

  // Set up valid card IDs
  uint32_t valid_id[] = {
  1234567890,
  0987654321
  };

  Re-compile and install your revised Sketch. Present the card again, it should now be identified as "valid".

  Note that relays will click for valid and invalid cards. The relays control the LEDs as well as the door.

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