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(randint(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 ||variables:set dice to|| block and drag the ||math:pick random|| into it.
• Drag a ||variables:dice|| variable from the Variables toolbox into the ||basic:show number|| block.

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

{Send the dice}

Put in a ||radio:send number|| and a ||variables:dice|| to send the value stored in the ||variables:dice|| variable via radio. Make sure to add a ||radio:set group|| to ||basic:on start|| with the group number set to the group you want to use.

radio.setGroup(1) let dice = 0 input.onGesture(Gesture.Shake, function () { dice = randint(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 ||variables: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 ||variables:receivedNumber|| is greater or equal to ||variables: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 radio.setGroup(1) input.onGesture(Gesture.Shake, function () { dice = randint(1, 6) basic.showNumber(dice) radio.sendNumber(dice) }) radio.onReceivedNumber(function (receivedNumber) { if (receivedNumber >= dice) { basic.showIcon(IconNames.Sad) } })

radio