UNO WiFi Rev 2 Chromebook Setup

A quick tutorial on how to setup your UNO WiFi Rev 2 board with a Chromebook, using the Web Editor & the Arduino Chrome App.


This tutorial is only relevant for Chromebook users that uses an Arduino UNO WiFi Rev 2 board.

The UNO WiFi Rev 2 is the connected version of the classic UNO board. If you are using a Chromebook, setting up your board is a bit different for this particular board:

  • You will need to upgrade the firmware using either a Windows/Mac/Linux computer, prior to programming it via a Chromebook. Detailed instructions are provided in this tutorial, and the process only takes a few minutes!
  • It is only possible to use the Web Editor, an online IDE that is part of the Arduino Cloud.


The goals of this project are:

  • Learn how to upgrade the firmware on your UNO WiFi Rev 2, so it can be used with a Chromebook.
  • Learn how to install the Arduino Create for Education app from Chrome Web Store.
  • Learn how to upload a sketch to your board using a Chromebook and the Web Editor.

Hardware & Software Needed

Upgrading Firmware

Since Chromebooks cannot run executables, the firmware upgrade for the UNO WiFi Rev 2 needs to be done through a Windows/Mac/Linux computer.

First download the optiboot_atmega4.hex file, and move it to your Desktop folder.

.hex file in your Desktop folder.
.hex file in your Desktop folder.

Connect your UNO WiFi Rev2 board to your computer and follow the instructions for each operative system below.

It is important that you move the

file to your desktop folder, otherwise the following commands won't work.


1. Download the AVRDUDE tool for Mac (.zip file) and unzip it to your Desktop folder.

2. Open a terminal, and run the following command:

1/Users/$(whoami)/Desktop/avrdude/bin/avrdude -C/Users/$(whoami)/Desktop/avrdude/etc/avrdude.conf -v -patmega4809 -cxplainedmini_updi -Pusb -b115200 -e -D -Ufuse2:w:0x01:m -Ufuse5:w:0xC9:m -Ufuse8:w:0x02:m -Uflash:w:/Users/$(whoami)/Desktop/optiboot_atmega4809.hex:i


1. Download the AVRDUDE tool for Windows (.zip file) and unzip it to your Desktop folder.

2. Open a command prompt (CMD), and run the following command:

1"%userprofile%/Desktop/avrdude/bin/avrdude.exe" -C "%userprofile%/Desktop/avrdude/etc/avrdude.conf" -v -patmega4809 -cxplainedmini_updi -Pusb -b115200 -e -D -Ufuse2:w:0x01:m -Ufuse5:w:0xC9:m -Ufuse8:w:0x02:m -Uflash:w:%userprofile%\Desktop\optiboot_atmega4809.hex:i


1. Download the AVRDUDE tool for Linux (.zip file) and unzip it to your Desktop folder.

2. Open a terminal, navigate to your root directory.

1cd /

3. Run the following command:

1/Users/$(whoami)/Desktop/avrdude/bin/avrdude -C/Users/$(whoami)/Desktop/avrdude/etc/avrdude.conf -v -patmega4809 -cxplainedmini_updi -Pusb -b115200 -e -D -Ufuse2:w:0x01:m -Ufuse5:w:0xC9:m -Ufuse8:w:0x02:m -Uflash:w:/Users/$(whoami)/Desktop/optiboot_atmega4809.hex:i

Expected Outcome

This will start a process of uploading the

file to your board. This will not take long, but make sure you do not disconnect the board from your computer. When finished, you should see the following output in the terminal (screen capture from Windows):

Successful upgrade
Successful upgrade

Now that your firmware is upgraded, you should see your board blinking (1 second off, followed by a quick blink). This is another proof that it was successful. You can now disconnect your board, and plug it into your Chromebook.

Check AVRDUDE Installation

The above commands utilizes a tool called AVRDUDE, which is included in each version of the IDE. To check whether it is accessible on your computer, you can run the following commands.








If the command fails to upgrade the firmware, please make sure that:

  • AVRDUDE is accessible (see above instructions). The commands are designed to look for the tool in the
    folder, so it will need to be unzipped there.
  • That you are using a Windows/Mac/Linux computer (remember, this cannot be performed on a Chromebook).
  • That you have the
    file in the Desktop folder. The command is written to look for it in that specific folder, so if it is not present, it will not work.

Install Arduino App (Chrome Store)

To program your Arduino via a Chromebook, you will need the Arduino Create for Education app. This is downloaded and installed via the Chrome Web Store.

Install the app.
Install the app.

If you have previously installed the app, make sure your version is up to date.

Web Editor

To use the Web Editor, you will need to be logged into your Arduino account. If you don't have an account, you will need to register one.

1. Head over to the Web Editor.

2. Create a new sketch, and write your program.

3. When you want to upload, connect your board to your computer via USB.

Connect your board to your computer.
Connect your board to your computer.

4. After connecting, the board's name and port is visible at the top of the editor (next to upload button). In this case, it is


Board discovered.
Board discovered.

5. Click the upload button. This will start the compilation process, and then upload the sketch to your board.

Congratulations, you have now uploaded a sketch to your UNO WiFi Rev 2 using the Web Editor on a Chromebook.

For more details on using the Web Editor, visit the Getting Started with Web Editor guide.


If things are not working as expected:


In this tutorial, we learned how to prepare the UNO WiFi Rev 2 board, to be used on a Chromebook. This was done by loading a specific hardware to the board, using the AVRDUDE tool and some custom commands.

For more tutorials on the UNO WiFi Rev 2 board, visit the official documentation.

Suggested changes

The content on is facilitated through a public GitHub repository. You can read more on how to contribute in the contribution policy.


The Arduino documentation is licensed under the Creative Commons Attribution-Share Alike 4.0 license.