Part 2. SD Card Setup

Note: Adding an SD card is optional if you only want to use the Arduino IDE for programming.

The Yun is unique from many other Arduino boards because it uses an SD card to boot from. The Yun uses OpenWRT to run it's Linux side and manage WiFi.

Plug your micro SD card into the SD card adapter and plug it into your computer. Make sure that your card is formatted to a FAT (not FAT 32) file system. This can be done from Disk Utility in Mac OSX or from the Computer window on Windows.

While your card is reformatting, you can download the latest OpenWRT image for the Yun on the Arduino Software page. Towards the bottom of the page, under "Other Software", you will see the latest OpenWRT image. Click on it and follow the prompts to download it.

Once your SD card is done formatting and OpenWRT has downloaded, copy the OpenWRT zip file to your SD card and eject the card. Now place the card in the Yun's micro SD slot and plug the Yun into your computer's USB port using the micro USB to USB cord.

Wait for the Yun to boot - it takes about a minute. You'll know it's finished when the white LED on the board comes on. Now check your available WiFi networks (the Yun creates it's own when it boots without a WiFi configuration) and connect to the one that says "Arduino Yun-90**********".

While connected to the Yun's Wifi, go to 192.168.240.1 into your browser address bar. You should see a page that looks like this:

The password is "arduino". On the following page, look for an orange RESET button - click it and wait for the Yun to reboot.

<< Part 2: Setting up the Yun - Part 2: Connecting to WiFi >>