Arduino Pro 328 - 5V/20MHz

Replacement: None. This is an unsupported version of the Arduino Pro. Arduino does not support 20mhz.

It’s blue! It’s skinny! It’s the Arduino Pro! SparkFun’s minimal design approach to Arduino. This is a 5V Arduino running the 20MHz bootloader.The power switch was moved to the side of the board (good idea Limor!) to allow control when a shield is attached.

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

This is a 20MHz board. This will get you maximum speed out of the ATmega328, but the current version of Arduino does not support the ATmega328 running at 20MHz. You can use the ‘Arduino Duemilanove w/ 328’ setting, but the timing and delays will assume the board is at 16MHz, so everything will run faster and may mess up timing limitations.

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 advanced users that understand the limitations of system voltage (5V), 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.

  • ATmega328 running at 20MHz external resonator
  • USB connection off board
  • 5V regulator
  • Max 150mA output
  • Over current protected
  • Reverse polarity protected
  • DC input 5V up to 12V
  • Resettable fuse prevents damage to board in case of short
  • Power select switch acts as on/off switch


Customer Comments

  • I would still like one of these, you still got any that you haven’t sold yet then or have they all gone?
    As TheMoogle says, there is a quick fix for this.
    The ATmega 644 wasn’t supported (but now sanguino uses it), the ATmega 645 wasn’t supported (Illuminato uses is).
    There are loads of boards that were not supported but can be sorted to work fine.

  • Replace this, please!

  • whaaaat?! when did this come out?
    will a 16mhz version be available at this pricepoint?
    this looks like a great way to transfer your one-off projects to a finished product! cheap, same layout as the dev board, no wacky pin spacing like the pro mini, half the price! nice one!

  • I got 2, both were acting funny, looked at them under a microscope and there was a lot of solder paste between several of the pins that was not melted and shorting them out. so if you have this same problem just give your arduino pro 20 mhz a alcohol bath and scrub it with a brush

  • Too late. Added it to my cart but was not fast enough :(.

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