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A000005 Arduino® Nano is an intelligent development board designed for building faster prototypes with the smallest dimensions. Arduino Nano, being the oldest member of the Nano family, provides enough interfaces for your breadboard-friendly applications. At the heart of the board is an ATmega328 microcontroller clocked at a frequency of 16MHz, featuring more or less the same functionalities as the Arduino® Duemilanove. The board offers 20 digital input/output pins, 8 analogue pins, and a mini-USB port. Typical applications include makers, security, environmental, robotics, and control systems.

• High-performance low-power 8-bit processor, achieve up to 16 MIPS for 16MHz clock frequency
• 32kB of which 2kB used by bootloader, 2kB internal SRAM, 1kB EEPROM
• 32 x 8 general purpose working registers, real time counter with separate oscillator
• Six PWM channels, programmable serial USART, SPI serial interface
• Mini-B USB connection
• 7-15V unregulated external power supply (pin 30), 5V regulated external power supply (pin 27)
• Conservative thermal limits for the whole board: -40°C to 85°C

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From January 2018 Arduino Nano will ship with upgraded bootloader. Arduino AVR Core 1.16.21 or later is required. Instructions to update are available here-https://www.arduino.cc/en/Guide/ArduinoNano.