Note: There are differences between the Arduino Yún and previous Arduino boards. As such, there could be incompatible Arduino shields and libraries. We have not tested the Arduino Yún with any Pololu shields.

Arduino Yún introduction


Arduino Yún Bridge library communication diagram.

Arduino Yún layout.

Arduino Yún reset buttons.

Arduino Yún indicator LED diagram.

The Arduino Yún is a microcontroller board based on the ATmega32U4 and the Atheros AR9331 that combines Arduino and Linux. The Atheros processor on the Yún runs Linino, a Linux distribution based on OpenWRT. The Arduino Bridge library facilitates communication between the two processors, giving Arduino sketches the ability to communicate with the Linux environment, running programs or making use of advanced peripherals. The USB host, network interfaces, and SD card are connected to the AR9331, and the Bridge library also enables the Arduino to interface with those peripherals. See Arduino’s guide to the Yún for more detailed information.

The Arduino Yún features a user-programmable ATmega32U4 AVR microcontroller that has built-in USB functionality, eliminating the need for a secondary processor or serial adapter for programming. This makes the Arduino Yún more versatile: in addition to supporting a virtual (CDC) serial/COM port interface, it can appear to a connected computer as a mouse and keyboard.

The Yún has 20 digital I/O pins (of which 7 can be used as PWM outputs and 12 as analog inputs), which are the same pins available on the Arduino Leonardo, and can be programmed through a Micro USB cable (not included) or over Wi-Fi. Power can be supplied to the Yún through a USB cable or the Vin pin (power supply not included). The Yún is also compatible with power over ethernet (PoE), but in order to use this feature you need to mount a PoE module on the board.

Warning: When powering the board through the Vin pin, you must supply a regulated 5 V. There is no on-board voltage regulator for higher voltages, which will damage the board.

The Arduino has a large support community and an extensive set of support libraries and hardware add-on “shields”, making it a great introductory platform for embedded electronics. Note that we also offer a SparkFun Inventor’s Kit, which includes an Arduino Uno along with an assortment of components (e.g. breadboard, sensors, jumper wires, and LEDs) that make it possible to create a number of fun introductory projects.

More information about the Arduino Yún is available on Arduino’s website.


The characteristics of the Yún’s two processors are shown below.

AVR Arduino microcontroller

Comparison table for the Arduino Uno, Baby Orangutan B-328, Orangutan SV-328, and Orangutan SVP-1284.

  • Microcontroller: ATmega32U4
  • Operating voltage: 5 V
  • Input voltage (recommended): 5 V
  • Digital I/O pins: 20 (of which 7 provide PWM output)
  • Analog input pins: 12 (1)
  • DC current per I/O pin: 40 mA
  • DC current for 3.3V pin: 50 mA
  • Flash memory: 32 KB of which 4 KB is used by bootloader
  • SRAM: 2.5 KB
  • EEPROM: 1 KB
  • Clock speed: 16 MHz

Linux microprocessor

  • Processor: Atheros AR9331
  • Architecture: MIPS @400 MHz
  • Operating voltage: 3.3 V
  • Ethernet: IEEE 802.3 10/100 Mbit/s
  • Wi-Fi: IEEE 802.11b/g/n
  • USB type-A: 2.0 Host/Device
  • Card reader: Micro-SD
  • RAM: 64 MB DDR2
  • Flash memory: 16 MB
  • PoE compatible 802.3af card support

(1) The Arduino Yún has 20 total available I/O lines; all of them can function as digital I/O lines, and twelve of them can be used as analog inputs.

Choosing the right controller

The table to the right compares the Arduino Uno to Orangutan robot controllers, which are based on the same AVR architecture and feature integrated motor drivers and additional hardware suitable for robotics applications. We also offer the Basic Stamp, which offers a lot of support and educational materials for beginners, and the much higher performance mbed development board, which is based on a 96 MHz 32-bit ARM Cortex M3. See their product pages for more information.



Size: 2.7" × 2.1"
Weight: 1.44 oz

General specifications

Processor: ATmega32U4 and Atheros AR9331
Motor channels: 0
User I/O lines: 201
Minimum operating voltage: 5 V
Maximum operating voltage: 5 V
Reverse voltage protection?: N
External programmer required?: N


All 20 can be used as digital I/O and 12 can be used as analog inputs.


File downloads

Arduino Yún schematic (115k pdf)


SKU PL-2472
Brand Arduino

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