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Description: At SparkFun we use many Arduinos and we’re always looking for the simplest, most stable one. Each board is a bit different and no one board has everything we want, so we decided to make our own version that combines all our favorite features. The SparkFun RedBoard combines the simplicity of the UNO’s Optiboot bootloader (which is used in the Pro series), the stability of the FTDI (which we all missed after the Duemilanove was discontinued) and the R3 shield compatibility of the latest Arduino UNO R3.

The RedBoard can be programmed over a USB Mini-B cable using the Arduino IDE: Just plug in the board, select “Arduino UNO” from the board menu and you’re ready to upload code. RedBoard has all of the hardware peripherals you know and love: 14 Digital I/O pins with 6 PWM pins, 6 Analog Inputs, UART, SPI and external interrupts. We’ve also broken out the SDA, SCL and IOREF pins that showed up on the UNO R3, so the RedBoard will be compatible with future shields. This version adds an SMD ISP header for use with shields.

You can power the RedBoard over USB or through the barrel jack. The on-board power regulator can handle anything from 7 to 15VDC. Check out the related items below for a compatible wall-wart power supply.

Not sure which Arduino or Arduino-compatible board is right for you? Check out our Arduino Buying Guide!


  • ATmega328 microcontroller with Optiboot (UNO) Bootloader
  • USB Programming Facilitated by the Ubiquitous FTDI FT231X
  • Input voltage - 7-15V
  • 0-5V outputs with 3.3V compatible inputs
  • 14 Digital I/O Pins (6 PWM outputs)
  • 6 Analog Inputs
  • ISP Header
  • 32k Flash Memory
  • 16MHz Clock Speed
  • All SMD Construction
  • R3 Shield Compatible
  • Red PCB!


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Customer Comments

  • I am looking for an “UNO” compatible solution that will operate at 3.3v. Is there a 3.3v “UNO” compatible solution?

    I am typically talking to LCD modules that have many bi-directional lines, so 3.3v to 5v conversion chips are numerous and messy.

    • That depends on what part of the Uno needs to be compatible. The Arduino Pro and Pro Mini use a different bootloader so they are not considered Uno compatible (and have slightly different hardware). But both boards use the ATMega328 and so should be compatible. There will always be a few differences including ATMega328s not being able to run at 16MHz at 3.3V (and still be in spec).

  • Any important differences we should know about, compared to ? I didn’t spot any looking at the two versions of the schematic. Literally the only substantive difference I spotted was a change in the value of R2 (current limiter for power LED LED2) from 1k to 4.7k.

    • Is that the resistor to the green LED? if so I’m glad since it was really bright.

    • The only other thing I can think of was that we removed the 3.3V line from the FTDI chip. When people were powering the board over anything other than USB there was enough power running to the chip that it affected the RX and TX lines. Now if the board is not powered over USB the FTDI chip gets absolutely no power. All in all the changes were all similarly small.

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