If you’ve worked with passive RFID before, you know that most ... 12 AA batteries and a custom PCB using an Arduino Nano to interpret the reader’s output. When the reader sees a nearby card ...

But his final iteration was to make a standalone reader with an Arduino and use WebUSB to connect ... He also decided against RFID but didn’t really say why. NFC business cards are a thing.

The project relies on the built-in Wi-Fi module of the Arduino Yun, and the microcontroller is connected to the sensors and RFID reader modules alongside an electronic strike to lock/unlock the door.