Remote Sensor Connections
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Remote sensor connections is a feature allowing other programs to connect to Scratch. This allows Scratch to be extended to connect to devices, access the internet, or perform other functions not possible inside Scratch. For example, JoyTail allows one to use a joystick with Scratch.
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.
The following software use this feature to connect to Scratch:
- JoyTail — joysticks
The following programming languages can connect to Scratch:
- Flash Actionscript
- Objective-C (Mac or iPhone application)
- Processing (Java)
- A Scratch Modification
You can also implement the Remote Sensors Protocol yourself in any language that supports sockets.