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- Install Python 3
- macOS has Python 2 pre-installed.
- The latest release version can be obtained from here.
Make a new project in Scratch 1.4. Find the Sensor Value block in the palette, right click on it, and select "enable remote sensor connections". Then drag out a When I Receive block and create the broadcast "hello".
Open a text editor and create a new file. Save it as communication.py (though any name will do), and put this code in it:
import socket HOST = 'localhost' PORT = 42001 sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.connect((HOST, PORT)) def sendCMD(cmd): sock.send(len(cmd).to_bytes(4, 'big')) sock.send(bytes(cmd, 'UTF-8')) sendCMD('broadcast "hello"')
Then run the program with Python. This can be done from IDLE, or from the command line: on Microsoft Windows, type this into Command Prompt, followed by Enter; on macOS or Linux, use the Terminal.
(On macOS and some GNU/Linux distributions,
python means Python 2.7, so instead type
python3.) Data can also be sent to Scratch by sending
sensor-update, followed by the name of a variable, followed by its new value. Then use Sensor Value to obtain the value. (Refer to Remote Sensors Protocol for details.)