Arduino small form factor development boards arduino a000108 the arduino yun mini is a microcontroller board that combines the ease of use of an arduino with the power of linux in a remarkably small package it is based around an atmel atmega32u4 microcontroller and the atheros ar9331 which supports a linux distribution called linino the board features wi fi support as well as a micro usb port microsd card slot 20x digital io pins a crystal oscillator a micro usb connection icsp heade