Sender and Receiver Scripts

This example uses one sender and at least one receiver micro:bit.  Both micro:bit modules can be connected to a single computer, or to separate computers in the same room.

• Start with just two micro:bit modules.
• Open two separate instances of the micro:bit Python Editor.  
  • If both micro:bit modules are connected to the same computer, they can be two different tabs in the same browser. 
  • If they are connected to different computers, you will need one micro:bit Python Editor running on each computer.
• If you are in a classroom, pair up with another student and adjust the radio.config(channel=7) statements in both scripts.  Make sure that each pair of students is using a unique channel number, from 0 to 83.
• Connect both micro:bit modules to USB ports.
• With the first micro:bit Python Editor, click Send to micro:bit to flash the Module 1: Sender script to one micro:bit module.
• Click Show serial.
• With the second micro:bit Python Editor, Click Send to micro:bit to flash the Module 2: Receiver script into one or more micro:bit modules.
• Click Show serial.

Module 1: Sender

# Module 1: Sender

import radio

def get_input_string():
    print("Enter text:")
    return input()

radio.on()
radio.config(channel=7)   # Set the radio channel, make sure it matches with the receiver
radio.config(length=250)  # Set the buffer size to 250 characters
while True:
    user_input = get_input_string()
    radio.send(user_input)
    print("Sent:", user_input)

Module 2: Receiver

# Module 2: Receiver

import radio

def execute_python_code(script_lines):
    try:
        script = "\n".join(script_lines)
        exec(script)
    except Exception as e:
        print("Error:", e)

radio.on() 
radio.config(channel=7)   # Set the radio channel, make sure it matches with the sender
radio.config(length=250)  # Set the buffer size to 250 characters

script_lines = []  # List to store the lines of the script
indent_level = 0   # Track the current indentation level

while True:
    incoming_message = radio.receive()
    if incoming_message is not None:
        print("Received:", incoming_message)

        if incoming_message == "run":
            execute_python_code(script_lines)
            script_lines = []  # Clear the script lines after running
            indent_level = 0   # Reset the indentation level
        else:
            # Adjust indentation based on leading spaces
            line_indent = len(incoming_message) - len(incoming_message.lstrip())
            if line_indent > indent_level:
                script_lines.append(incoming_message[indent_level:])
            else:
                script_lines.append(incoming_message)