What is it?

Unduino1284p is an Arduino-compatible development, prototyping and control board featuring the powerful ATmega1284p MCU and onboard USB-to-serial converter, in a very small (but still breadboard-friendly) form-factor. The board is directly programmable from within the Arduino IDE, or using avr-gcc tools.



  • ATmega1284p MCU clocked at 16 MHz
  • 16 KB of RAM
  • 128 KB of flash
  • All MCU pins broken out on board
  • On-board USB-to-serial converter (FT230XS)
  • USB Mini-B connector
  • Dimensions: 43 x 24 mm
  • 3.3v output (max 50mA)

Pin Layout

The Arduino core for Unduino1284p is based onĀ MightyCore by MCUDude, and follows the same pin mapping. Native port descriptions are printed on the bottom of the board. The following pinout also displays the mapping to Arduino pins, and the most commonly used extra functions of the various pins.

Adding Unduino to the Arduino IDE

I provide a board support package that automatically adds support for all Unsigned.io boards to the Arduino IDE. Please read this post for instructions on how to add it.

Getting one

You can purchase the Unduino1284p from my shop. I ship worldwide.

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