78 lines
2.1 KiB
Markdown
78 lines
2.1 KiB
Markdown
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# Micro Chat
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## Introduction @unplugged
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Use the **radio** to send and receive messages with other @boardname@.
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## Sending a message @fullscreen
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Use ``||input:on button pressed||`` to send a number over radio with ``||radio:send string||``.
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All @boardname@ nearby will receive this message.
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You can also add ``||basic:show icon||`` and ``||basic:clear screen||`` blocks to show a little animation when the message is sent.
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```blocks
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input.onButtonPressed(Button.A, () => {
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radio.sendString("Yo");
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basic.showIcon(IconNames.Chessboard)
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basic.clearScreen();
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});
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```
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## Receiving a message @fullscreen
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Add a ``||radio:on received number||`` block to run when a message is received.
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```blocks
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radio.onReceivedString(function (receivedString) {
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})
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```
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## Displaying text @fullscreen
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Add a ``||basic:show string||`` to display the string on the screen. You will find the ``receivedString`` variable
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under the **Variables** toolbox.
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```blocks
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radio.onReceivedString(function (receivedString) {
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basic.showString(receivedString);
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})
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```
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## Testing in the simulator @fullscreen
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Press button **A** on the simulator, you will notice that a second @boardname@ appears (if your screen is too small, this might not happen). Try pressing **A** again and notice that the "Yo" message gets displayed on the other @boardname@
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```blocks
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input.onButtonPressed(Button.A, () => {
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radio.sendString("Yo");
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basic.showIcon(IconNames.Chessboard)
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basic.clearScreen();
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});
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radio.onReceivedString(function (receivedString) {
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basic.showString(receivedString);
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})
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```
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## Try it for real @fullscreen
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If you have @boardname@s, download the program to two @boardname@. Press button **A** on one and see if the other gets a message.
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## Groups @fullscreen
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Use the ``||radio:set group||`` block to assign a **group** number to your program. You will only receive messages from @boardname@ within the same group. Use this to avoid receiving messages from all the other @boardname@.
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```blocks
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/**
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* Pick a unique group in your classroom!
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*/
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radio.setGroup(123)
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```
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```package
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radio
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```
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