A second Arduino is used to read NFC and RFID cards using a Mifare RC522 reader. The system uses its own credit system, so a user can be issued a card with a certain amount of pre-paid credit.

Instructables user talk2bruce created the Arduino Internet Gizmo, a card reader that takes you to your favorite websites with a touch of an RFID tag.

You can connect your Arduino to the FTDI lines for quick programming, or you can remove the on-board ATMEGA328-PU chip and insert it into your Arduino UNO directly as another method of quick ...