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The ExtraCore MD is a postage stamp sized Arduino clone 21mm x 23mm (.92″ x .825″), and only 2.2mm (.09″) thick. Arduino-compatible board based on the original Extracore by Dustin Andrews.

It has 14 digital input/output pins (6 of which are hardware PWM), 8 analog inputs (6 of which are GPIO), and a 16 MHz crystal oscillator.

It runs Optiboot (select “Arduino Uno” in the Boards menu), and has “.100 pitch headers for easy breadboard prototyping.

Its small size makes it well-suited to applications with stringent weight and space requirements, such as R/C planes, wearables, and spacecraft.


  • 23.5mm x 21mm x 2.2mm, 2.2mm tall
  • Programmable with a Modern Device USB-BUB II or any FTDI adapter
  • ATmega328
  • Optiboot bootloader (Arduino UNO board setting)
  • Standard Atmega (Arduino) 328 features
  • 14 I/O pins
  • 8 analog pins (A6, A7, are analog input only – no I/O)
  • 16MHz
  • 32kB Flash Memory
  • 2kB RAM


Additional information

Weight 2.4 g
Dimensions 1 × 1 × .1 in