You can already work with micro:bit inputs and the display. Today you will connect two micro:bits with radio so one can send a message and the other can show it.

You will start a new project in the MakeCode editor and build it up in stages at your own device: think first about what should happen, then build it, run it and fix whatever does not work.

Microbits have a radio transceiver built into them. A transceiver is an electronic device which is a combination of a radio transmitter and a receiver, hence the name. It can both send and receive radio waves using an antenna, for communication purposes.

For this project you will need 2 Microbits so you can send and receive messages.

Go to the https://makecode.microbit.org website and create a new project.

The first thing we need to do is set the radio group that our micro:bits will be broadcasting on. A radio group is the channel that the Microbit both sends its messages and listens for other messages. A Microbit can only send or receive in one group at a time.

A Microbit that is on radio group 2 will not be able to receive a message from another Microbit that is on radio group 3. However, if they are both on radio group 3, they can communicate with each other.

Add the following code to set the radio group to 1.

radio.setGroup(1)

We can send different types of messages, we can send:

1. A string (text) message.
2. A number message.
3. A name and value message.

Let's start off by sending a string message. Add the following code to send the message "Hello" when you press the A button.

input.onButtonPressed(Button.A, function () {
    radio.sendString("Hello")
})