Working with radio

The Micro:bit comes with a built-in 2.4 GHz radio module. Using the built-in library radio, we can send and receive messages wirelessly. For demonstrations of the radio functionality, we do not need to create a circuit. We are ready to go by just powering up a few Micro:bit devices.

Turning the radio on and off

We can get started by turning the radio of a Micro:bit on and off with the following simple code executed in a REPL:

>>> from microbit import *
>>> import radio
>>> radio.on()
>>> radio.off()

Let’s learn to send and receive messages.

Sending and receiving messages

We can send messages with the built-in radio.send() method. The maximum length of the string that can be sent with this method is 250 characters. Let’s write the code for a transmitter routine:

from microbit import *
import radio
try:
    radio.on()
    while True:
    ...