Arduino Uno

The Arduino Uno is the best board to get started with if this is your first experience tinkering with the Arduino platform. The Uno is robust and well-documented, so you can get all the guidance you need, and even if you make some mistakes, the board does not get damaged easily. The Arduino Uno has a resettable polyfuse that protects your computer's USB ports from shorts and over-current. Although most computers provide their own internal protection, the fuse provides an extra layer of protection. If more than 500 mA is applied to the USB port, the fuse will automatically break the connection until the short or overload is removed.

Specifications

Arduino Uno is a microcontroller board based on the ATmega328P microcontroller chip manufactured by Amtel. The ATmega328 has 32 KB (with 0.5 KB used for the bootloader). It also has 2 KB of SRAM and 1 KB of EEPROM (which can be read and written with the EEPROM library).

The Arduino Uno operates on 7 volts to 12 volts input power with 5V and 3.3V output signals. The board can be supplied with power either from the DC power jack (7V-12V) with an AC-DC adapter, the USB connector (5V) connected to a computer, or the VIN pin of the board (7V-12V) with a battery.

The Arduino Uno can be programmed with the Arduino Integrated Development Environment (IDE). The ATmega328 on the Arduino Uno comes pre-programmed with a bootloader that allows you to upload new code to it without the use of an external hardware programmer. Rather than requiring a physical press of the reset button before an upload, the Arduino Uno board is designed in a way that allows it to be reset by software running on a connected computer.

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See the Uno Board Pinout and Pin Functions guide which is a must-have reference when assembling circuits.