166 lines
4.7 KiB
Markdown
166 lines
4.7 KiB
Markdown
# Hot Or Cold
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### @description A Hot-or-Cold treasure hunt game
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### ~avatar avatar
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Find the hidden @boardname@ before the other players!
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### ~
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https://youtu.be/nbRfNug-RkY
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## Beacons
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In this game, players are looking for hidden @boardname@ that emit radio signals.
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The hidden @boardname@ are called **beacons**.
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### Setting up the radio
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We set the radio group to ``1`` to make sure all the players are using the same group.
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We also tell the @boardname@ to transmit its serial number (that's a unique number that identifies it)
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so that the player can tell apart each beacon. We also reduce the power of the antenna to reduce the range of transmission.
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```block
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radio.setGroup(1)
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radio.setTransmitSerialNumber(true)
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radio.setTransmitPower(6)
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```
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### Beacon gotta beam
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The beacon simply needs to send a radio message every now and then. To pace it out,
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we add some ``|show icon|`` blocks to animate the screen.
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```blocks
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basic.forever(() => {
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radio.sendNumber(0)
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basic.showIcon(IconNames.Heart)
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basic.showIcon(IconNames.SmallHeart)
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})
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radio.setGroup(1)
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radio.setTransmitSerialNumber(true)
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radio.setTransmitPower(6)
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```
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### Hide the beacons
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Download the code to your beacon @boardname@ and hide them!
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## Hunters
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The hunter @boardname@ look for beacons.
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### Is the beacon close?
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To determine how far or close, we use the signal strength of each radio packet sent by the beacons. The signal
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strength ranges from ``-128db`` (weak) to ``-42db`` (very strong).
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```blocks
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radio.onDataPacketReceived( ({ receivedNumber, signal }) => {
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basic.showNumber(signal)
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});
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radio.setGroup(1)
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```
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Take notes of the values as you move around the beacon.
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* hot signal value: ``_________________``
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* mild signal value: ``_________________``
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* cold signal value: ``_________________``
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### Hot or cold?
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The hunter screen displays ``SmallDiamond`` on the screen if the beacon is far, ``Diamond`` mildly close and ``Square`` if it is close. Use the ``signal`` values collected in the previous step to determine when to show those letters.
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Here is an example that uses ``-95`` and less for cold, between ``-95`` and ``-80`` for mild and above ``-80`` for hot. Use your own values based on the room setup or the hidding place.
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To make the program more responsive, we add a ``|led stop animation|`` to cancel any icon animation when a new beacon packet comes.
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```blocks
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radio.onDataPacketReceived( ({ receivedNumber, signal }) => {
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led.stopAnimation();
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if (signal < -90) {
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basic.showIcon(IconNames.SmallDiamond)
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} else if (signal < -80) {
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basic.showIcon(IconNames.Diamond)
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} else {
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basic.showIcon(IconNames.Square)
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}
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})
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radio.setGroup(1)
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```
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Download the code and play the game!
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## Extra: Multiple beacons
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We're making the game more interresting by counting how many beacons a player has seen so far.
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### Remember the beacons
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Remember that the beacon was configured to transmit its serial number? We can use this information
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to determine if we've visited a beacon for the first time.
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To do so, we are going to add an **array** variable that will hold all the beacon serial numbers seen so far.
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```block
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let beacons: number[] = [0]
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```
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Whenever we receive a new packet, we are going to check if the ``beacons`` already
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contains the serial number. If not, we add the serial number at the end of ``beacons`` and increment the ``|game score|``.
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To check if an ``array`` contains an element, we use the ``|find index of|`` block which returns ``-1``
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if the value is not found.
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```blocks
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let beacons: number[] = [0]
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radio.onDataPacketReceived( ({ receivedNumber, signal, serial }) => {
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if (signal > -50 && beacons.indexOf(serial) < 0) {
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beacons.push(serial)
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game.addScore(1)
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basic.showNumber(game.score())
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}
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})
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```
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### Show my score
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To see the current score, we add a ``|on button pressed|`` that displays the score on screen when ``A`` is pressed.
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```block
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input.onButtonPressed(Button.A, () => {
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basic.showNumber(game.score())
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})
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```
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### All together
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The hunter code with all th pieces together looks like this now. Download it and try it out with multiple beacons!
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```blocks
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let beacons: number[] = [0];
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radio.onDataPacketReceived( ({ receivedNumber, signal, serial }) => {
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led.stopAnimation();
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if (signal < -95) {
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basic.showIcon(IconNames.SmallDiamond)
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} else if (signal < -80) {
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basic.showIcon(IconNames.Diamond)
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} else {
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basic.showIcon(IconNames.Square)
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if (signal > -50 && beacons.indexOf(serial) < 0) {
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beacons.push(serial)
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game.addScore(1)
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basic.showNumber(game.score())
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}
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}
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})
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input.onButtonPressed(Button.A, () => {
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basic.showNumber(game.score())
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})
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radio.setGroup(1)
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```
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