Arduino Yún has WiFi connectivity and Linux

Arduino platform seems to interest many Internet of Things developers. There are now many Arduino compatible platforms with wireless connectivity as you can see in my New interesting Arduino platforms article and it’s comment. Also Google has done some Arduino based IoT.

Arduino launches Yún for WiFi connectivity under Linux article tells that Arduino has been revamped to offer WiFi connectivity under Linux, in order to make connecting to complex web services much easier directly from the device. The new board (not yet available to buy) is named the Arduino Yún, which apparently is Chinese for “cloud”. It was announced in annual “State of Arduino” presentation at the Maker Faire conference in California on Saturday.

Arduino Yún is the combination of a classic Arduino Leonardo (based on the Atmega32U4 processor) with a Wifi system-on-a-chip running Linino (a MIPS GNU/Linux based on OpenWRT). WiFi system on chip Atheros AR9331 on the board runs customised version of the Linux operating system (OS) distribution OpenWRT called Linino.

“Historically, interfacing Arduino with complex web services has been quite a challenge due to the limited memory available and they tend to use verbose text based formats like XML that require quite a lot of RAM to parse,” Arduino’s blog post read.

On the Arduino Yún all network connections and processing of HTTP transactions is done in the Linux machine in WiFi SoC, so it does not cause burden to Arduino hardware. Using the Bridge library in your sketches, you can link the 32u4 to Linux. Arduino Yún Brings WiFi has the following picture that seems to indicate that Linux and Atmel 32u4 are linked together with SPI and UART pins.

The Yún Linux part supports Shell and Python scripts out-of-the-box but you can install a wide range of open source software and tools. Yún can be also reached with SSH.

Usually setting up WiFi connection on embedded systems is usually hard (especially if you want to connect to protected network). Arduino Yún board claims to have easy way to set up the device network connection: When the Yún is turned on for the first time, it becomes an Access Point, creating a Wi-Fi network named “Arduino”. Open your browser and go to the webpanel: configure the board by entering your Wi-Fi network name, type and password. Click the “Configure” button to restart the board and have it join your home network.

The Yún ATMega32u4 can be programmed as a standard Arduino board by plugging it to your computer with the micro USB connector. And you can also program it via Wi-Fi (Arduino IDE has option to set IP address instead of port name).

Arduino Yún developers have partnered with startup Temboo which provides normalized access to 100+ APIs from a single point of contact allowing developers to mix and match data coming from multiple platforms (for example Twitter, Facebook, Foursquare but even FedEx or PayPal).

This looks interesting. The first question that come to mind ofter the feature is when this will become available and what does this cost? Arduino blog tells that Arduino Yún will be available at the end of June at the price of 69$ + taxes. Plus on this: Finally a board that handles everything without the need for shields, breakouts, dongles and other boards! I like both worlds… Arduino and Embedded Linux boxes.

Looks somewhat interesting, but keep in mind that RPi is still only half the price of the Yun and you can add WiFi to it with very cheap USB adapters. You can get a raspberry + an arduino for the same price … and they work together very well.

There is also other competition on the field. Just few days earlier another company called Spark Devices launched a similar idea on Kickstarter called Spark Core. That initiative puts forward a Wi-Fi capable board for Arduino projects that permits wireless programming and the ability to interface with Web services. The initial price for this Spark Core idea is $39. The hardware designs for the Core are available to check out at the GitHub repository.

There will clearly be competition on the cheap WiFi enabled Arduino like embedded platforms.


  1. Tomi Engdahl says:

    Arduino board plugs DIYers into the cloud for $69–69

    SAN MATEO, Calif. – Massimo Banzi launched a $69 board that aims to plug do-it-yourself-ers into the cloud. The Yun is the first of a family of low cost, low power Arduino cards that run Linux and Wi-Fi, surfing the trend toward the Internet of Things.

    Yun, named for the Chinese word for cloud, aims to let the average tinkerer link a new Linux gadget to the Web using a simplified browser interface. “We want to make it easy for people to create complex Web apps,” Banzi told a packed crowd at the center stage of the Maker Faire event here.

    Yun links to the Web via the Hornet AR9331 Wi-Fi chip from Qualcomm Atheros which supports 2.4 GHz networking and runs a custom distribution of Linux, said Federico Musto who had the idea for the board and did the initial design work. Musto shared his idea with Banzi when the two met by accident on a train in December.

    Musto showed a Qualcomm Atheros representative at the Consumer Electronics Show in January an early version of the board based on a reverse engineered smartphone module using the AR9331. A technical director of the company subsequently gave approval to supply the chip for the open source boards.

  2. Tomi Engdahl says:

    The Arduino YUN. YUN means cloud.

    For the longest time, the creators of the Arduino have been looking at how to bring the Arduino platform into the cloud. Ethernet and WiFi shields technically work, but if you’re processing data scraped from a web page, a lowly microcontroller really isn’t the best option. Enter the Arduino YUN. At its core, it’s a regular old Arduino Leonardo. Underneath that metal plate on the board? That’s an SoC running Linux.

    Basically, the Linux side of the Yun is pretty similar to a WiFi router running OpenWRT. There’s a USB port for plugging in peripherals, native WiFi support (802.11n, even!), an Ethernet connector, and enough RAM to do all the interesting stuff a small computer connected to the Internet can do.

  3. Tomi Engdahl says:

    There’s also support for Temboo, an SDK for dozens of APIs that interact with Facebook, Dropbox, FedEx, and hundreds of other web services.

  4. Tomi Engdahl says:

    Something WiFi This Way Comes; Wicked Device Unveils Wildfire

    Wicked Device has released the WildFire board to the world. WildFire is a an Arduino compatible processor board with a Texas instruments CC3000. WildFire adds a few interesting features to the typical ‘Duino clone. Instead of the ATMega328 used in the Arduino Uno, the WildFire uses an ATMega1284p

    As with any non-standard Arduino board, the WildFire does require some modification to the Arduino IDE. This took a bit of time with the pre-release board. Wicked Device has streamlined the process since then.

    Once the IDE is up and running, its easy to get the WildFire’s CC3000 connected to your local access point. From there the internet is your playground.

  5. Tomi Engdahl says:

    Turning A Router Into An Arduino Yún

    The Arduino Yún was the first of a new breed of Arduinos that added a big honkin’ Linux System on Chip to the familiar ATMega microcontroller and unique pin headers. It’s a surprisingly powerful system, but also very simple: basically, it’s just an Atheros AR9331 running Linux, an ATMega32u4 doing its Arduino thing, both connected by a serial connection. The Atheros AR9931 is also found in a router popular amongst hardware hackers. It really was only a matter of time before someone ported the Yun software to a router, then.

  6. Tomi Engdahl says:

    Is The Arduino Yun Open Hardware?

    According to [Squonk42], nope. And we think he’s probably right.

    The Yun is an Arduino Leonardo with an Atheros AR9331 WiFi SoC built in. It’s a great idea, pairing the Arduino with a tiny WiFi router that’s capable of running OpenWRT. But how is this no longer Open Source Hardware? Try getting an editable board layout. You can’t.

    [Squonk42]’s hypothesis is that Arduino must have done what any “sane” engineer would do in this case when presented with a super-complex piece of hardware and a potentially tricky radio layout: just use the reference design (Atheros AP-121). That’s what everyone else in the industry did. And that’s smart, only the rest of the consumer electronics industry isn’t claiming to be Open Source Hardware while the reference design is protected by an NDA.

    So it looks like Arduino’s hands are tied.

    Is this a change of strategy for the Arduino folks or did they just make a mistake?


    maybe it is time for Open hardware class
    tier 1: All opensource including IC
    teir 2: Opensource exclude IC
    teir 3: exclude any kind of module, NDA layout
    teir 4:exclude any binary driver, NDA code

    I think the Yún is the project of the Martino-led Arduino company now being sued by the Banzi-headed Arduino company. The latter one pushes for the open source idea while the former does not.

    Actually Banzi has griped about Arduino clones that don’t pay money to him.
    Yet many $3 clones are custom designs that use cheaper serial chips than the ch340 and sometimes have a beefier 3.3v regulator than the $30 uno.

  7. Tomi Engdahl says:

    Irrighino, an Arduino Yun Based Watering System

    There are many different ways to keep your plants watered on a schedule. [Luca Dentella] just created a new one by building the irrighino watering system. He used standard off the shelf, hardware to keep it simple. Irrighino is a complete watering system based on the Arduino Yun, featuring a user friendly AJAX interface. This allows scheduling in a manner similar to creating appointments in Outlook. It’s also possible to manually control the various water solenoids. The code is fully customizable and open source, with code available from [Luca’s] github repository. The web interface is divided in to three tabs – “runtime” for manual control, “setup” to configure the scheduling, and “events” to view system logs.


    Irrighino is a complete watering system, based on Arduino Yun.

    The main features are:

    a configurable number of solenoid valves
    an AJAX web interface
    a weekly schedule
    manual activation / deactivation

  8. Tomi Engdahl says:

    Network Enabled Servo Dead Bolt
    Using an Arduino Yun to monitor WiFi for my cellphone and unlock my dead bolt with

    The basic idea is to have an Arduino Yun ping the local IP addresses of my phone to see if I’m home. With this, I can establish a set of events or settings based on my presence. Step one is having a door that can unlock itself based on certain criteria. (i.e. I’m home, I email it, it’s a certain time of day, RFID, etc.)

  9. Tomi Engdahl says:

    ArduWorm: A Malware for Your Arduino Yun

    We’ve been waiting for this one. A worm was written for the Internet-connected Arduino Yun that gets in through a memory corruption exploit in the ATmega32u4 that’s used as the serial bridge. The paper (as PDF) is a bit technical, but if you’re interested, it’s a great read.

    The crux of the hack is getting the AVR to run out of RAM, which more than a few of us have done accidentally from time to time. Here, the hackers write more and more data into memory until they end up writing into the heap, where data that’s used to control the program lives. Writing a worm for the AVR isn’t as easy as it was in the 1990’s on PCs, because a lot of the code that you’d like to run is in flash, and thus immutable.

    In the end, the worm is persistent, can spread from Yun to Yun, and can do most everything that you’d love/hate a worm to do. In security, we all know that a chain is only as strong as its weakest link, and here the attack isn’t against the OpenWRT Linux system running on the big chip, but rather against the small AVR chip playing a support role. Because the AVR is completely trusted by the Linux system, once you’ve got that, you’ve won.

    ArduWorm: A Functional Malware Targeting Arduino Devices


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