Arduino Pro 328 - 3.3V/8MHz

Replacement:DEV-10914. The new version of this board uses a sturdier right angle switch and eliminates the overhang for the FTDI header. This page is for reference only.

It's blue! It's skinny! It's the Arduino Pro! SparkFun's minimal design approach to Arduino. This is a 3.3V Arduino running the 8MHz bootloader (select 'Arduino Duemilanove w/ 328' within the Arduino software). The power switch was moved to the side of the board (good idea Limor!) to allow control when a shield is attached. This board does not work with the 5V Arduino shields but does work nicely with our prototyping shield.

Please note: Arduino 0015 supports the ATmega328 but not yet at 8MHz. Please select 'Arduino Duemilanove w/ 328' within the Arduino software but expect your delays to work twice as long (code will run half as fast as the Duemilanove at 16MHz).

Please note: The right-angle power switch is fragile. We're working on making the switch stronger. For now, please be gentle.

Arduino Pro does not come with connectors populated so that you can solder in any connector or wire with any orientation you need. We recommend first time Arduino users start with the Duemilanove. It's a great board that will get you up and running quickly. The Arduino Pro series is meant for users that understand the limitations of system voltage (3.3V), lack of connectors, and USB off board.

We wanted Arduino Pro to be low profile. The DC power jack footprint is available, but not populated. We recommend running the board with a LiPo battery for better portability.

We really wanted to minimize the cost of an Arduino. The Arduino Pro is like the Arduino Duemilanove (same pin out) but to keep the cost low, we used all SMD components, made it two layer, etc. This board connects directly to the FTDI Basic Breakout board and supports auto-reset. The Arduino Pro also works with the FTDI cable but the FTDI cable does not bring out the DTR pin so the auto-reset feature will not work.

Can't decide which Arduino is right for you? Arduino buying guide!

**Note: **A portion of this sale is given back to Arduino LLC to help fund continued development of new tools and new IDE features.

  • ATmega328 running at 8MHz external resonator
  • Low-voltage board needs no interfacing circuitry to popular 3.3V devices and modules (GPS, Accelerometers, sensors, etc)
  • USB connection off board
  • 3.3V regulator
  • Max 150mA output
  • Over current protected
  • Reverse polarity protected
  • DC input 3.3V up to 12V
  • Resettable fuse prevents damage to board in case of short
  • Power select switch acts as on/off switch
  • 2.1x2.05" (53.34x52.08mm)



Looking for answers to technical questions?

We welcome your comments and suggestions below. However, if you are looking for solutions to technical questions please see our Technical Assistance page.

  • esm / about 12 years ago / 3

    Just FYI: the images (when you click on them) are no bigger than the thumbnails. The images on the 5V/16MHz board product page look right, though.

  • Does any one know that actual Atmel Atmega 328 part number used on the 3.3V board. I just got off the phone with Atmel and they are telling me that they don't recommend running any ATMEGA328 at 3.3 V only 1.8V or 5V.

  • emihackr97 / about 12 years ago / 1

    Hi, what voltage regulator do this boards use?

  • Toucan / about 12 years ago / 1

    How efficient is the voltage regulator?
    Rumor has it that the Uno has a very inefficient regulator.
    Is this the best choice if you're interested in extended battery life?
    Is the efficiency a fn of VIN?
    Is it more efficient to, say, supply a VIN of 4.5V than, say, a VIN of 9V?

  • disabelle / about 12 years ago / 1

    so can u adapt a 9v battery to this or do i have to use a 3.4v battery? (sorry im new to this and this would be better its smaller and cheaper and looks better)

  • Member #192243 / about 12 years ago / 1

    it'd be great if you could break out the other two ADC pins on future revisions of the smd arduinos... maybe put them somewhere out of the way as not to interfere with the standard arduino shield footprint...

  • RLovelock / about 13 years ago / 1

    Any idea of when these will be available again?

  • Nelson.r.o / about 13 years ago / 1

    Please on a future board review add a MAX1555 feeding from the ftdi and from the dc barrel it would be great

  • REDACTED-GDPR / about 13 years ago / 1

    I would like to connect the Arduino Pro 328 a Serial Enabled 16x2 LCD.
    This gives no problems with the debugging because the TXD also used?

  • GeneW / about 14 years ago / 1

    Have you fixed the baud rate set-up error in the boot loader?

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