More info on the new Arduino UNO

by Stephen Hobley on September 27, 2010

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(Via LadyAda’s Blog)

More information available on the new Arduino UNO.

“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 Arduno, 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.”

Check out the Arduino UNO page at

Also available are the reference schematic and board designs:

EAGLE files:
Schematic: arduino-uno-schematic.pdf

Over at LadyAda’s Blog K. Scharf makes the following interesting observation about the design:

“Some strange choices of parts on this design. There are two 16mhz crystals, one for the USB processor and one for the main processor. The crystal for the USB processor looks like a standard through hole crystal, while a very small SMT crystal is used for the main processor. YET the USB processor itself is a very small SMT unit and the main procesor is in a DIP package. (I’d expect the user processor to be socketed to allow use any memeber of the ‘megax8 family, yet if they used the TQFP packed device they could squeeze two more A/D inputs on). Is the source code for the USB processor available? Can it be upgraded via bootstrap, or only via the (unpopulated) dedicated ISP connector? (Hmmm, that would require a two stage bootstrap wouldn’t it?)”


{ 1 comment… read it below or add one }

Sinaga November 24, 2012 at 10:19 am


Can you share me arduino uno schematic with “.sch” and “.brd” filer

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