The newly released Arduino Leonardo has a few very interesting features, most notably the ability to act as a USB keyboard and mouse thanks to the new ATmega 32U4 microcontroller. This feature ...

But his final iteration was to make a standalone reader with an Arduino and use WebUSB to connect to ... connected correctly because he was using a Leonardo board. But the biggest problem was ...

It's like a shrunken version of the Arduino Leonardo as it features the same ... the flexibility of choosing which type of header to use on your board, you can go with this headerless version.