BoostLEGO BOOST

The LEGO BOOST kit brings your LEGO creations to life with powerful motors, a color sensor and more. By combining it with Scratch, you can build your own robotic creatures, tell physical-digital stories, invent new game controllers, or whatever else you can imagine.
Illustration of the LEGO BOOST.
Requirements
Windows 10 version 1709+macOS 10.15+ChromeOSAndroid 6.0+BluetoothScratch Link
Choose your OS:

Install Scratch Link

1
Download and install Scratch Link.
orDirect download
2
Start Scratch Link and make sure it is running. It should appear in your notification area (system tray).
3
To learn more about Scratch Link, click here.If you have trouble, see the Troubleshooting section for tips.

Getting Started

Connecting BOOST to Scratch

1

Use the Scratch editor.

2
In the editor, click on the "Add Extensions" button on the lower left.

Add the BOOST extension.

Things to Try

Make a motor move

1
Find the “turn motor A on for 1 seconds” block and click on it.
2
Connect a LEGO beam with an axle to motor A and click the block again to make it spin.
A LEGO BOOST hub with an axle and a short beam connected to motor A.

Starter Projects

A Scratch project with a white cat

Feed the Cat

Feed a robot cat with colored LEGO bricks.

A Scratch project with a wheeled robot with eyes

Driving

Drive around a wheeled robot and make music.

A Scratch project with character on a green background

Walk Around

Make your own controller to move a character on the screen.

Troubleshooting

Make sure Scratch Link is running

If Scratch Link does not appear in your notification area (system tray), run Scratch Link from your Start menu.

Make sure your browser is compatible with Scratch Link

Scratch Link is compatible with most browsers on macOS and Windows. For Safari, please update to Scratch Link 2.x, Safari 14 or newer, and macOS 10.15 or newer.

Make sure you have the latest version of Scratch Link

Install Scratch Link using the button above. We recommend using the app store installation process to help keep your version up to date.

Make sure your operating system is compatible with Scratch Link

The minimum operating system versions are listed at the top of this page. See instructions for checking your version of Windows or macOS.

If you are using macOS 12, please update to macOS 12.3 or newer. Earlier versions of macOS 12 may not work correctly with Scratch Link.

Close other copies of Scratch

Only one copy of Scratch can connect with a BOOST at a time. If you have Scratch open in other browser tabs, close it and try again.

Make sure no other computer is connected to your sensor

Only one computer can be connected to a BOOST at a time. If you have another computer connected to your sensor, disconnect the sensor or close Scratch on that computer and try again.

Make sure you have location services enabled on Chromebooks or Android tablets

Bluetooth can be used to provide location data to the app. In addition to granting the Scratch App permission to access location, location must be enabled in your general device settings. Search for 'Location' in your settings, and make sure it is on. On Chromebooks search for 'Location' in the Google Play Store Android preferences.