DescriptionBack to top
• Wide variety of accessory "Shields" available
• Intended for roboticists, artists, designers and hobbyists
• Variety of I/O pins including analog, digital, PWM and more
• Based on the ATmega328 (removable DIP IC)
• Revision 3
The Arduino Uno is a microcontroller board based on the ATmega328 microchip. It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz crystal oscillator, 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 or power it with an or 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 programmed as a USB-to-serial converter. "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 Arduno, moving forward. The Uno is the latest in a series of USB Arduino boards, and the reference model for the Arduino platform.
The Arduino Uno can be programmed with the Arduino software. Select "Arduino Uno from the Tools > Board menu (according to the microcontroller on your board). For details, see the reference and tutorials. The ATmega328 on the Arduino Uno comes preburned with a bootloader that allows you to upload new code to it without the use of an external hardware programmer.
Supplier Product CodeBack to top
DimensionsBack to top
• Width: 2.1 inches
The USB connector and power jack extend beyond these dimensions.
Four screw holes allow the board to be attached to a surface or case.
Note that the distance between digital pins 7 and 8 is 160 mil (0.16"), not an even multiple of the 100 mil spacing of the other pins.
Useful LinksBack to top
• ATmel ATMega 328 Datasheet
• Arduino Uno Schematic
• Arduino Uno Microcontroller Reference Design
• RobotShop Learning Center: Arduino Microcontroller Feature Comparison
• RobotShop Learning Center: Arduino 5 Minute Tutorials
• RobotShop Learning Center:
• Arduino Language Reference and Website
• Arduino Cheat Sheet
• Arduino - Starter Kit
• Official Arduino Forum
Servo ArticleBack to top
SpecificationsBack to top
• 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