93 lines
2.4 KiB
Markdown
93 lines
2.4 KiB
Markdown
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# Mood Radio
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## @description A mini mood messaging app using radio
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This project uses the [radio](/reference/radio) to share your mood with other @boardname@.
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When you press ``A``, you friends will see a **smilley**. When you press ``B``, they will see a **frownie**.
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## Sending a smiley
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The @boardname@ can't understand mood but it is pretty good with numbers. In fact, it can send numbers
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between @boardname@ using the radio antenna, just like phones.
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Let's add blocks that send a number when button ``A`` is pressed. In our "code",
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we assume that **0** means "smiley".
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```blocks
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input.onButtonPressed(Button.A, () => {
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radio.sendNumber(0)
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basic.showIcon(IconNames.Happy)
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})
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```
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## Receiving a smiley
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We add a ``radio on received`` block that will run code whenever a new message code in.
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The ``receivedNumber`` variable contain the numeric value that was sent. Since we've decided that
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**0** was **smiley**, we add a conditional **if** statement to show this icon.
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```blocks
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radio.onDataPacketReceived( ({ receivedNumber }) => {
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if (receivedNumber == 0) {
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basic.showIcon(IconNames.Happy)
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}
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})
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```
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## Sending a frowney
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Adding another code in our messaging app is very similar. We decide that **1** means **forwnie**.
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Then we can add a ``B`` button event that sends that code.
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```blocks
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input.onButtonPressed(Button.B, () => {
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radio.sendNumber(1)
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basic.showIcon(IconNames.Sad)
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})
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```
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If the ``on radio received`` block, we add an conditional **if** statement to handle the new code.
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```blocks
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radio.onDataPacketReceived( ({ receivedNumber }) => {
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if (receivedNumber == 0) {
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basic.showIcon(IconNames.Happy)
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}
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if (receivedNumber == 1) {
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basic.showIcon(IconNames.Sad)
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}
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})
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```
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That's it. Download your code in multiple @boardname@ and try it out!
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## Challenges
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Try adding a new code and use the **shake** event to send it.
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## Full sources
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```blocks
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input.onButtonPressed(Button.A, () => {
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radio.sendNumber(0)
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basic.showIcon(IconNames.Happy)
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})
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input.onButtonPressed(Button.B, () => {
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radio.sendNumber(1)
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basic.showIcon(IconNames.Sad)
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})
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radio.onDataPacketReceived( ({ receivedNumber }) => {
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if (receivedNumber == 0) {
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basic.showIcon(IconNames.Happy)
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}
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if (receivedNumber == 1) {
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basic.showIcon(IconNames.Sad)
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}
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})
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```
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```package
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radio
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```
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