Arduino Nano 3.0 (ATmega328): since the free version of Eagle does not handle more than 2 layers, and this version of the Nano is 4 layers, it is published here unrouted, so users can open and use it in the free version of Eagle.

Specifications:

Microcontroller: Atmel ATmega168 or ATmega328

Operating Voltage (logic level): 5 V

Input Voltage (recommended): 7-12 V

Input Voltage (limits): 6-20 V

Digital I/O Pins: 14 (of which 6 provide PWM output)

Analog Input Pins: 8

DC Current per I/O Pin: 40 mA

Flash Memory: 16 KB (ATmega168) or 32 KB (ATmega328) of which 2 KB used by bootloader

SRAM: 1 KB (ATmega168) or 2 KB (ATmega328)

EEPROM: 512 bytes (ATmega168) or 1 KB (ATmega328)

Clock Speed: 16 MHz

Dimensions: 0.73" x 1.70"

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