After all, the Arduino boards come with a host of benefits ... the Uno), fewer GND pins (two versus three), and no IOREF pin, which the Uno includes. You'll also notice that the Nano's pins ...

Most of us are familiar with the Arduino ... pin layout (Arduino shields likely won’t fit) and more I/Os than the ATmegas have. Sure, it’s not as practical as an actual Arduino Uno, but ...

and additional SDA and SCL pins. Since the discontinuation of the original and Rev2 boards, the Rev3 has become the face of the Uno family and the Arduino brand in general. In fact, it's ...