Multi Dice

Introduction

Build a multi-player dice game using the radio. The radio blocks let you send wireless messages between a micro:bit and another micro:bit.

In this game, you shake to “throw the dice” and send the result to the other micro:bit. If you receive a result of a dice throw equal or greater than yours, you lose.

Dice game

Let’s start by rebuilding the dice game. If you are unsure about the details, try the dice tutorial again.

input.onGesture(Gesture.Shake, function () {
    basic.showNumber(Math.randomRange(1, 6))
})

Dice variable

We need to store the result of the dice cast in a variable. A variable is like a place in the memory of the micro:bit where you save information, like numbers.

• Go to the Variables toolbox and click ||Make a Variable|| to create a new variable. We will call it dice.
• Add a ||set dice to|| block and drag the ||pick random|| into it.
• Drag a ||dice|| from the Variables toolbox into the ||basic:show number|| block.

let dice = 0
input.onGesture(Gesture.Shake, function () {
    dice = Math.randomRange(1, 6)
    basic.showNumber(dice)
})

Send the dice

Put in a ||radio:send number|| and a ||dice|| to send the value stored in the dice variable via radio.

let dice = 0
input.onGesture(Gesture.Shake, function () {
    dice = Math.randomRange(1, 6)
    basic.showNumber(dice)
    radio.sendNumber(dice)
})

Receive the dice

Go get an ||radio:on received number|| event block. This event runs when a radio message from another micro:bit arrives. The receivedNumber value is the value of the dice in this game.

radio.onReceivedNumber(function (receivedNumber) {
})

Check your cast

Add a ||logic:if|| block to test if receivedNumber is greater or equal to dice. If is, you lost so display a sad face on the screen.

let dice = 0;
radio.onReceivedNumber(function (receivedNumber) {
    if (receivedNumber >= dice) {
        basic.showIcon(IconNames.Sad)
    }
})

Test it!

Try pressing SHAKE in the simulator and see that a second micro:bit appears. You can play the game on both virtual boards.

If you have more than one micro:bit, download your code onto each one and try playing the game with your friends!

let dice = 0
input.onGesture(Gesture.Shake, function () {
    dice = Math.randomRange(1, 6)
    basic.showNumber(dice)
    radio.sendNumber(dice)
})
radio.onReceivedNumber(function (receivedNumber) {
    if (receivedNumber >= dice) {
        basic.showIcon(IconNames.Sad)
    }
})

radio