Arduino Uno Board

Table of contents


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 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 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 Atmega8U2 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 Arduino, moving forward. The Uno is the latest in a series  of USB Arduino boards, and the reference model for the Arduino platform.
Operating Voltage5V
Input Voltage (recommended)7-9V
Input Voltage (limits) 6-20V
Digital I/O Pins 14 (of which 6 provide PWM output)
Analog Input Pins6
DC Current per I/O Pin40 mA
DC Current for 3.3V Pin50 mA
Flash Memory32 KB (ATmega328) (0.5 KB used by bootloader)
SRAM2 KB (ATmega328)
EEPROM1 KB (ATmega328)
Clock Speed16 MHz
Comment List
  • it wasn't until i came across these wonderful little microcontrollers that I really even thought of using them. I supose that there was always the mysitque of programming that got to me.

    since seeing how easy and straight forward they are it has inspired me to bite the proverbial bullet and learn to program.

  • Usually I just use the regular i/o female headers on the board, because the programming cable I have is one of those 10-pin ones, but I'm sure you can use the ICSP header image

  • Do you use the socket on the UNO to do the programming or wire from the UNO pins to your circuit?

  • These things are really versatile. The real magic of this doesn't come from the hardware (tbh, the board isnt all that well designed in my opinion), but the IDE and the libraries that come with it. Those goodies transform a regular old atmega328p into this beast image


    ...Although I did get fed up with using other people's libraries, so I reverted back to just programming AVRs in C image

    But I now use the Arduino as an ISP programer! DEFINITELY worth the 30 odd dollars I spent on it.

  • Thank you very much!!


    I should be able to give the Arduino a decent workout on Memorial Day weekend. I'm anxious to find out how well it works with high impedence inputs and small dot matrix LCD displays.


    Jeff Salzman

  • Great! I just received a UPS e-mail, mine arrives tomorrow!

  • Thanks Joann!  I am excited to get working with the Arduino Uno!! 

  • Hi Everyone.


    Thank you all for applying. This RoadTest is now closed. We are pleased to announce the following members that have been selected to receive a Arduino Uno Road Test:


    • Christopher Niffenegger
    • Jeff Salzman
    • Emiliano Valencia
    • Nicolas Mantha-Duffy
    • Kevin Fisk


    Congratulations! Your product will be shipped to the address each of you provided when you applied for this RoadTest. As a reminder, element14 and our supplier partners send these products free-of-charge because we place high value upon your unbiased, detailed product review. Please post your review back here within 3-6 weeks of receiving your item.


    For those who were not selected to win this product, we have the IMO iSmart Road Test open for applicants


    Enroll today and Good Luck!!!  image

  • Looks like only 3 people have been tagged as review pending, with 5 kits available who got the other kits? Also looks like they were the first 3 to enrol. If this is the case it is not very random selection. Just my 2c worth.

    Keep up the good work guys. Hopefully I am luckier on another road test.



  • FYI - the issue has been resolved, and applicants are again displayed on each RoadTest page.  This Arduino RoadTest has ended and winners should be annouced soon (usually by Joann Alvarez).


    Thank You,