Version 1.0 of the Arduino IDE for the Arduino Uno board has now evolved to newer releases. The Uno board was the successor of the Duemilanove release and was the 9th version in a series of USB-based Arduino boards.

The word ' uno' means 'one' in Italian and was chosen to mark a major redesign of the Arduino hardware and software. Layout and production files for some versions of the hardware are also available. The hardware reference design is distributed under a Creative Commons Attribution Share-Alike 2.5 license and is available on the Arduino website. It has the same microcontroller as the Arduino Nano board, and the same headers as the Leonardo board. It can be powered by a USB cable or a barrel connector that accepts voltages between 7 and 20 volts, such as a rectangular 9-volt battery. The board has 14 digital I/O pins (six capable of PWM output), 6 analog I/O pins, and is programmable with the Arduino IDE (Integrated Development Environment), via a type B USB cable. The microcontroller board is equipped with sets of digital and analog input/output (I/O) pins that may be interfaced to various expansion boards (shields) and other circuits. Its programming is not different from Arduino UNO.The Arduino Uno is an open-source microcontroller board based on the Microchip ATmega328P microcontroller (MCU) and developed by and initially released in 2010. After installing the IDE you just need to go to TOOLS> BOARDS> Arduino Nano and you are ready to upload the programs with the help of Mini USB B cable. To connect and program this development board you need to have Arduino IDE installed in your computer and the Mini USB Programming Cable.

Flash memory: 32KB in which 2KB is used by Bootloader.

Supports Serial, I2C, SPI Communication Protocols.

It has 22 I/O pins in total in which 14 are Digital (6 are PWM output) and 8 are Analog pins.

Due to its small size its very popular among IoT based projects which need to be small and user friendly, in Robotics, in Automation, Instrumentation and Control systems Arduino Nano is a small, breadboard-friendly development board based on an ATmega 328P SMD package microcontroller and offers the same connectivity and specs of Arduino Uno in a small package. DC Power Jack is not available on this board so power can only be supplied by a Mini B USB port present on it or 6-20V unregulated external power supply from Pin 30 (Vin).

Arduino uno r3 datasheet pdf