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The Arduino Uno is a microcontroller board based on the ATmega328 (datasheet). It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz ceramic resonator, a USB connection, a power jack, an ICSP header, and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started.
The Uno differs from all preceding boards in that it does not use the FTDI USB-to-serial driver chip. Instead, it features the Atmega16U2 (Atmega8U2 up to version R2) programmed as a USB-to-serial converter.
Revision 2 of the Uno board has a resistor pulling the 8U2 HWB line to ground, making it easier to put into DFU mode.
Revision 3 of the board has the following new features:
1.0 pinout: added SDA and SCL pins that are near to the AREF pin and two other new pins placed near to the RESET pin, the IOREF that allow the shields to adapt to the voltage provided from the board. In future, shields will be compatible with both the board that uses the AVR, which operates with 5V and with the Arduino Due that operates with 3.3V. The second one is a not connected pin, that is reserved for future purposes.
Stronger RESET circuit.
Atmega 16U2 replace the 8U2.
"Uno" means one in Italian and is named to mark the upcoming release of Arduino 1.0. The Uno and version 1.0 will be the reference versions of Arduino, moving forward. The Uno is the latest in a series of USB Arduino boards, and the reference model for the Arduino platform; for a comparison with previous versions, see the index of Arduino boards.
Operating Voltage 5V
Input Voltage (recommended) 7-12V
Input Voltage (limits) 6-20V
Digital I/O Pins 14 (of which 6 provide PWM output)
Analog Input Pins 6
DC Current per I/O Pin 40 mA
DC Current for 3.3V Pin 50 mA
Flash Memory 32 KB (ATmega328) of which 0.5 KB used by bootloader
SRAM 2 KB (ATmega328)
EEPROM 1 KB (ATmega328)
Clock Speed 16 MHz
Arduino Uno R3
This review is from: Arduino Uno R3 Authentic Made in Italy 5 Volt 16 MHz 32KB Flash 1KB EEPROM Development Board for Electronic Device Development, Design, and Classroom. C++ Coding & compatible with hundreds of shields.
Pros: Hundreds of compatible shields, thousands of tutorials on the web. A great way to learn hardware programming and the ins-and-outs of the Atmel ATmega microcontroller.
Cons: The Arduino IDE, while simple and usable for pretty much anything you throw at it, does leave some things to be desired for a guy who programs Windows applications for pay (like myself). More advanced debugging features would be nice, but with sufficient knowledge of programming and the project you're working on, there's nothing you can't do. The IDE won't stand in your way, but it won't offer you a hand, either. Plug ins (both free and for-charge) exist for IDEs such as Microsoft Visual Studio for more advanced features, but this may be beyond the understanding of some users.
Other Thoughts: Simply put, the Arduino Uno is the IBM PC of microcontroller boards. It is the standard by which all others are judged and strive to be. If you need a small, inexpensive, flexible platform with which to automate and manipulate electronic components, this is your answer. The Arduino is the board that made microcontroller programming available to the masses.
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