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Arduino Nano CH340 has a lower cost USB-Serial Chip that makes it less in price than the Arduino.
The Arduino Nano is a small, complete, and breadboard-friendly board based on the ATmega328 (Arduino Nano 3.x). It has more or less the same functionality of the Arduino Duemilanove, but in a different package. It lacks only a DC power jack, and works with a Mini-B USB cable instead of a standard one.
Comparison with Arduino UNO:
Features:
Specifications: