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Arduino Yun (Yun)

by Arduino
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  • ATmega32U4 microcontroller and Atheros AR9331 (Linux part)
  • WiFi IEEE 802.11b/g/n and Ethernet IEEE 802.3 10/100Mbit/s
  • MicroUSB Connector

The Arduino Yún is a microcontroller board based on the ATmega32u4 (datasheet) and the Atheros AR9331. The Atheros processor supports a Linux distribution based on OpenWRT named Linino. The board has built-in Ethernet and WiFisupport, a USB-A port, micro-SD 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 a 3 reset buttons.

The Yún distinguishes itself from other Arduino boards in that it can communicate with the Linux distribution onboard, offering a powerful networked computer with the ease of Arduino. In addition to Linux commands like cURL, you can write your own shell and python scripts for robust interactions.

The Yún is similar to the Leonardo in that the ATmega32u4 has built-in USB communication, eliminating the need for a secondary processor. This allows the Yún to appear to a connected computer as a mouse and keyboard, in addition to a virtual (CDC) serial / COM port.

The Bridge library facilitates communication between the two processors, giving Arduino sketches the ability to run shell scripts, communicate with network interfaces, and receive information from the AR9331 processor. The USB host, network interfaces and SD card are not connected to the 32U4, but the AR9331, and the Bridge library also enables the Arduino to interface with those peripherals.



Because the Yún has two processors, the summary section shows the characteristics of each one in two separate tables.


AVR Arduino microcontroller


Operating Voltage5V

Input Voltage5V

Digital I/O Pins20

PWM Channels7

Analog Input Channels12

DC Current per I/O Pin40 mA

DC Current for 3.3V Pin50 mA

Flash Memory32 KB (of which 4 KB used by bootloader)



Clock Speed16 MHz

Linux microprocessor

ProcessorAtheros AR9331

ArchitectureMIPS @400MHz

Operating Voltage3.3V

EthernetIEEE 802.3 10/100Mbit/s

WiFiIEEE 802.11b/g/n

USB Type-A2.0 Host/Device

Card ReaderMicro-SD only


Flash Memory16 MB

PoE compatible 802.3af card support 

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