The Arduino Yún is a microcontroller board based on the ATmega32u4 and the Atheros AR9331. The Atheros processor supports a Linux distribution based on OpenWRT named Linino. The board has built-in Ethernet and Wi-Fi support, a USB-A port, microSD card slot, 20 digital input/output pins (of which 7 can be used as PWM outputs and 12 as analog inputs), a 16 MHz crystal oscillator, a Micro-USB connection, an ICSP header, and 3 reset buttons.

 

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Due to constant product improvements the actual product appearance might differ from the shown images. Product images are for illustrative purposes only.