Multiple beacons

We’ll making the game more interesting by counting how many beacons the hunting player has seen so far.

Who are you beacon?

Modify your beacon code to transmit the serial number as well. We will use that number to identify the beacon.

radio.setGroup(1)
radio.setTransmitPower(6)
// @highlight
radio.setTransmitSerialNumber(true)

Remember the beacons

Back in the seeker project, we add an array variable that will hold all the beacon serial numbers seen so far.

let beacons: number[] = [0]

Whenever we receive a new packet, we are going to check if the beacons array already contains the serial number. If not, we add the serial number at the end of beacons and increment the ||game:score||.

To check if an array contains an certain element, we use the ||arrays:find index of|| block which returns -1 if the element is not found.

let beacons: number[] = [0]
let signal = 0;
let serialNumber = 0;
radio.onReceivedNumber(function (receivedNumber) {
    signal = radio.receivedPacket(RadioPacketProperty.SignalStrength)
    serialNumber = radio.receivedPacket(RadioPacketProperty.SerialNumber)
    if (signal > -50 && beacons.indexOf(serialNumber) < 0) {
        beacons.push(serialNumber)
        game.addScore(1)
        basic.showNumber(game.score())
    }
})

Show my score

To see the current score, we add an ||input:on button pressed|| that displays the score on the screen when the A button is pressed.

input.onButtonPressed(Button.A, () => {
    basic.showNumber(game.score())
})

All together

The hunter code with all th pieces together looks like this now. Download and try it out with multiple beacons!

let beacons: number[] = [0];
let signal = 0;
let serialNumber = 0;
radio.onReceivedNumber(function (receivedNumber) {
    signal = radio.receivedPacket(RadioPacketProperty.SignalStrength)
    serialNumber = radio.receivedPacket(RadioPacketProperty.SerialNumber)
    led.stopAnimation();
    if (signal < -95) {
        basic.showIcon(IconNames.SmallDiamond)
    } else if (signal < -80) {
        basic.showIcon(IconNames.Diamond)
    } else {
        basic.showIcon(IconNames.Square)
        if (signal > -50 && beacons.indexOf(serialNumber) < 0) {
            beacons.push(serialNumber)
            game.addScore(1)
            basic.showNumber(game.score())
        }
    }
})
input.onButtonPressed(Button.A, () => {
    basic.showNumber(game.score())
})
radio.setGroup(1)

radio