Remote Sensor Connections

Remote sensor connections is a feature allowing other programs to connect to Scratch. This allows it to be extended to connect to devices, access the internet, or perform other functions not possible inside Scratch. For example, JoyTail allows you to use a joystick with Scratch.

Enabling

This requires Scratch 1.3.1 or higher.

• Right-click on the () Sensor Value block, found in the sensing category.
• Select the "Enable remote sensor connections" option.

Now Scratch is ready to send and receive data over the network.

How it works

Remote Sensor connections turn Scratch into a local server at port 42001. Whenever either:

• A broadcast is sent
• A global variable is changed

It sends out a message to all connected programs with the relevant information.

Software

The Scratch Wiki is not responsible for the security of external programs or links in this page or section.

The following software use this feature to connect to Scratch:

• Joytail — joysticks
• GlovePIE — Wii remotes (warning: site appears to be hacked)

Languages

The following programming languages can connect to Scratch:

• Flash Actionscript
• Python
• Objective-C (Mac or iPhone application)
• Processing (Java)
• Ruby
• A Scratch Modification

You can also implement the Remote Sensors Protocol yourself in any language that supports sockets.