Arduino Pro 168 - 3.3V/8MHz

Replacement:DEV-09219 and DEV-09221. This has been replaced with a new version with the ATmega328. 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 'LilyPad' within the Arduino software). The Arduino Pro is very much like the Skinny, but we added a handful of features to become a fully certified Arduino board. 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: 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 Diecimila. 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 Diecimila (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!

The Arduino Pro will slowly but surely be replacing the Skinny.

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

  • ATmega168V 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
  • 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



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.

  • Roach / about 12 years ago / 1

    What's the resonator used in this board? The Sparkfun EAGLE lib says it's the CSTCE10M0G55, but that's a 10MHz resonator. Should I be looking for an 8MHz? OR will a 10MHz do (at 3.3V)?

  • GeneW / about 13 years ago / 1

    Is the 3V3 power from the FTDI Basic Breakout board not connected directly to either the battery input or the ext in? Will the FTDI Basic Breakout board be damaged if I forget to disconnect alternate power during USB connection>

  • jsc / about 13 years ago / 1

    What is the voltage regulator used? The schematic and Eagle files don't say. How many mA can you pull from it?

  • Nero / about 13 years ago / 1

    I love Arduino so much (especially this board)! It's a great size and, combined with the FTDI Breakout, a fantastic price.
    However, I do have one question: I am unable to find a model with more than 6 analog inputs. Am I overlooking something or should I take some other route?

  • 33Warlord / about 14 years ago / 1

    Is there any chance that you are considering a 5V version of the Pro? How about a Mega368 Version?
    I love the size and features of the Pro (no god-awful USB type-B jack, FTDI pins, etc... But I have a lot of shields that require 5V, so I'm stuck running other main boards.

  • Farnsworth / about 14 years ago / 1

    Any chance of you making the other 2 ADC channels (ADC6 & 7) available to us? It seems a waste to do nothing with 2 good pins.

  • NickD / about 14 years ago / 1

    This board is 8MHz, vs 168MHz for the Diecimila . Does this mean it's half the speed?

    • Farnsworth / about 14 years ago / 1

      NickD: Hey,
      This board is 8MHz, vs 168MHz for the Diecimila . Does this mean it's half the speed?

      The Diecimila is _**not **_ 168 MHz, it is only 16 MHz, one order of magnitude less than you wrote.

    • Yep - the Arduino Pro 8MHz runs at 8MIPS. We will be offering 16MHz and 20MHz versions within a few days.

  • WestfW / about 14 years ago / 1

    Are there two versions of the USB/TTL Serial breakout cable? I have a Modern Devices Bare Bones Board and the FTDI cable that they sell, and the connector pin labeled 3.3V on the "Pro" is labeled (and measures) 5V on the BBB... (Granted, the "pro" is designed to spend less time connected to USB...)

    • We plan to only carry a 3.3V version of the FTDI Basic breakout.
      Using our FTDI board to power a 5V BBB during programming shouldn't be a major issue. We've done many mean things to the FT232R internal 3.3V regulator (shorted 3.3V to ground, reversed polarization, connected to a 5V powered system) and haven't killed one yet.

  • Will the board automatically cutoff at 3 volts to prevent over discharging the lipos?

    • Our LiPos have over voltage, under voltage, and over current protection. The board won't automatically cut off at ~2.9V but our batteries will.

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