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 Micorbits will be broadcasting on. A radio group is the channel that the Microbit both sends it's 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 then then we 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 my 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")
})