The Arduino Nano was designed by Gravitech, and is manufactured by them and many others. The Gravitech unit says "Gravitech" on it, and has the company logo. So do the many knock-offs. The appearance of quality is the only thing I have found to distinguish between the fakes and the real thing.
In addition to the standard 14 digital pins, the Nano has 8 analog inputs available. It uses a ceramic resonator instead of a crystal, but the size reduction is substantial. The Nano uses the FTDI FT232RL USB to Serial converter chip, which also supplies the 50mA 3.3V at pin 17.
There are shields available which fit on the Arduino Nano v3, and there are mounting boards the size of the standard Arduino that allow the use of Arduino shields. I'm not sure why one would want to spend $35.00 on a Nano, and $10.00 on an adapter to turn it into a $25.00 Arduino Uno, but it can be done.
A size comparison of the four small form factor Arduino boards is helpful to see where the Arduino Nano fits in the tiny Arduino board lineup.
|Test Current Draw|