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  • Arduino Yun
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Arduino Yun


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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 OS. The board has built-in Ethernet and WiFi support, a USB-A port, micro-SD card slot, 20 digital input/output pins (7 of them 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.

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

The Yún is similar to the Leonardo with the ATmega32u4, except that it has Linux on board. (has built-in USB communication, eliminating the need for a secondary processor).


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

AVR Arduino microcontroller

Microcontroller: ATmega32u4

Operating Voltage: 5V

Input Voltage: 5V

Digital I/O Pins: 20

PWM Channels: 7

Analog Input Channels: 12

DC Current per I/O Pin: 40 mA

DC Current for 3.3V Pin: 50 mA

Flash Memory: 32 KB (of which 4 KB used by bootloader)

SRAM: 2.5 KB


Clock Speed: 16 MHz

Linux microprocessor

Processor: Atheros AR9331

Architecture: MIPS @400MHz

Operating Voltage: 3.3V

Ethernet: IEEE 802.3 10/100Mbit/s

WiFi: IEEE 802.11b/g/n

USB Type-A: 2.0 Host

Card Reader: Micro-SD only


Flash Memory: 16 MB

PoE compatible 802.3af card support (see the note below)  

Length: 73 mm

Width: 53 mm

Weight: 32 g

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