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The Arduino Nano is a compact board similar to the UNO.The Arduino Nano is a small, complete, and breadboard-friendly board based on the ATmega328P (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.
The Arduino Nano can be powered via the Mini-B USB connection, 6-20V unregulated external power supply (pin 30), or 5V regulated external power supply (pin 27). The power source is automatically selected to the highest voltage source.
Each of the 14 digital pins on the Nano can be used as an input or output.They operate at 5 volts. Each pin can provide or receive a maximum of 40 mA and has an internal pull-up resistor (disconnected by default) of 20-50 kOhms. In addition, some pins have specialized functions.
The Nano has 8 analog inputs,each of which provide 10 bits of resolution.By default they measure from ground to 5 volts, though is it possible to change the upper end of their range using the analogReference() function. Analog pins 6 and 7 cannot be used as digital pins. Additionally, some pins have specialized functionality.
The Arduino Nano has a number of facilities for communicating with a computer, another Arduino, or other microcontrollers.Such as UART TTL (5V) serial communication and I2C (TWI) and SPI communication

Description

More Download Information: www.kookye.com/?p=6382
--The Arduino Nano is a small, complete, and breadboard-friendly board based on the ATmega328 (Arduino Nano 3.x).
--The Arduino Nano can be powered via the Mini-B USB connection, 6-20V unregulated external power supply (pin 30), or 5V regulated external power supply (pin 27). The power source is automatically selected to the highest voltage source.
--The ATmega328 has 32 KB, (also with 2 KB used for the bootloader). The ATmega328 has 2 KB of SRAM and 1 KB of EEPROM.

--Specification--
MicrocontrollerAtmel Atmega328P-AU MCU
Operating Voltage (logic level)5 V
Input Voltage (recommended)7-12 V
Input Voltage (limits)6-20 V
Digital I/O Pins14 (of which 6 provide PWM output)
Analog Input Pins8
DC Current per I/O Pin40 mA
Flash Memory16 KB (ATmega168) or 32 KB (ATmega328) of which 2 KB used by bootloader
SRAM2 KB (ATmega328)
EEPROM1 KB (ATmega328)
Clock Speed16 MHz

Support USB download and Power
Support for external 5V ~ 12V DC power supply
Support power supply by 9V battery
Support ISP download
CH340G Driver Download link : http://www.wch-ic.com/download/list.asp?id=126 OR http://www.5v.ru/ch340g.htm
IDE of arduino Download link : http://arduino.cc/en/Main/Software

Dimensions0.73" x 1.70"
Length45 mm
Width18 mm
Weigth5 g

Package:
5x Nano Board