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.

Enabling remote sensor connections.png

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.


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The following software use this feature to connect to Scratch:


The following programming languages can connect to Scratch:

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

  • This page was last modified on 18 November 2014, at 14:02.