The Nano is a microcontroller board based on the ATmega328Â (datasheet), developed in conjunction with Adafruit. It has 22Â digital input/output pins (of which 6Â can be used as PWM outputs and 8Â as analog inputs), a 16 MHz crystal oscillator, a mini USB connection, an ICSP header, and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a mini-BÂ USB cable to get started. It has a form factor that enables it to be easily placed on a breadboard.
The Micro board is similar to the Arduino Leonardo in that the ATmega328Â has built-in USB communication, eliminating the need for a secondary processor. This allows the Micro to appear to a connected computer as a mouse and keyboard, in addition to a virtual (CDC) serial / COM port.
