91 lines
2.3 KiB
Markdown
91 lines
2.3 KiB
Markdown
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# Radio Dashboard
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```typescript
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/**
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* Radio monitoring dashboard
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*
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* Each radio client is represented by a dot on the screen.
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* Once a client is registered, it will stay at the same pixel location
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* forever.
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*
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* Radio clients can simply send a number (between 0..255) on group 4.
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* They must transmit the serial number using ``radio.setTransmitSerialNumber(true)``
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*
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* The received number is used to set the LED brightness for that client.
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*
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* If the radio packet is not received for 10sec, the LED starts blinking.
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*/
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const deadPing = 20000;
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const lostPing = 10000;
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interface Client {
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// client serial id
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id: number;
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// sprite on screen
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sprite: game.LedSprite;
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// last ping received
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ping: number;
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}
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const clients: Client[] = [];
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/* lazy allocate sprite */
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function getClient(id: number): Client {
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// needs an id to track radio client's identity
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if (!id)
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return undefined;
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// look for cached clients
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for (const client of clients)
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if (client.id == id)
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return client;
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const n = clients.length;
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if (n == 24) // out of pixels
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return undefined;
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const client: Client = {
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id: id,
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sprite: game.createSprite(n % 5, n / 5),
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ping: input.runningTime()
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}
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clients.push(client);
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return client;
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}
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// store data received by clients
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radio.onReceivedNumber(function (receivedNumber) {
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const serialNumber = radio.receivedPacket(RadioPacketProperty.SerialNumber)
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const client = getClient(serialNumber);
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if (!client)
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return;
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client.ping = input.runningTime()
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client.sprite.setBrightness(Math.max(1, receivedNumber & 0xff));
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})
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// monitor the sprites and start blinking when no packet is received
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basic.forever(() => {
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const now = input.runningTime()
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for (const client of clients) {
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// lost signal starts blinking
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const lastPing = now - client.ping;
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if (lastPing > deadPing) {
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client.sprite.setBlink(0)
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client.sprite.setBrightness(0)
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}
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else if (lastPing > lostPing)
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client.sprite.setBlink(500);
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else
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client.sprite.setBlink(0);
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}
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basic.pause(500)
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})
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// setup the radio and start!
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radio.setGroup(4)
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game.addScore(1)
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```
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```package
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radio
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```
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