Microbit JavaScript
Hard
60 mins
230 points
What you need:
  • Computer/laptop

JavaScript - Exactly 11

In this project we create a Microbit game where you have to guess when exactly 11 seconds has passed! This is the JavaScript version of this project.

1 - Create a new Microbit project

Create a new Microbit project.

2 - Create a 'starttime' variable

In the game the player will try and guess when 11 seconds has passed. We will need a variable to remember the start time to create a variable called 'starttime' by adding the following code.

let starttime = 0

This code creates a variable called 'starttime' and sets it's value to 0.

3 - Set the start time

Now add the following new code to remember when the clock is started and to show an icon to let the user know the clock has started.

let starttime = 0

// add this code
input.onButtonPressed(Button.A, function () {
    starttime = input.runningTime()
    basic.showIcon(IconNames.SmallDiamond)
})

The input.runningTime() code returns the number of milliseconds since the program started. (One second is 1000 milliseconds).

Note that in JavaScript when you put // in the code, the computer treats this line as a comment and not actually code that it needs to run.

// this a comment
let firstname = 'Sophie'

let lastname = 'Jones' // this is another comment

Putting comments in your code is a good idea as it gives some extra information to anyone looking at your code and helps them understand it better.



4 - Create a 'taken' variable

Now create a variable called 'taken', we are going to use this to store the amount of time it has taken between pressing A and pressing B.

Add the new code to your project.

let starttime = 0
let taken = 0 // add this new code

input.onButtonPressed(Button.A, function () {
    starttime = input.runningTime()
    basic.showIcon(IconNames.SmallDiamond)    
})

5 - Set the taken time

Now let's program the B button to set the 'taken' by subtracting the 'starttime' from the current running time.

Add the following new code.

let starttime = 0
let taken = 0

input.onButtonPressed(Button.A, function () {
    starttime = input.runningTime()
    basic.showIcon(IconNames.SmallDiamond)    
})

// add this code
input.onButtonPressed(Button.B, function () {
    taken = input.runningTime() - starttime
})

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