62 lines
1.6 KiB
Markdown
62 lines
1.6 KiB
Markdown
# counter lesson
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Learn how to create a counter with with on button pressed. #show #number #screen #number #math #docs
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### @video td/videos/counter-0
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## Topic
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Variables
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## Quick Links
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* [activity](/microbit/lessons/counter/activity)
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* [challenges](/microbit/lessons/counter/challenges)
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* [quiz](/microbit/lessons/counter/quiz)
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* [quiz answers](/microbit/lessons/counter/quiz-answers)
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## Prior learning/place of lesson in scheme of work
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Learn how to creating a **variable** to keep track of the current count. We will be learning how to create a counter app using a variable as well as simple commands, such as on button pressed, and show number.
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## Documentation
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```docs
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input.compassHeading()
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basic.forever(() => {
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})
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let x = 0
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if (true) {
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}
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basic.showString("Hello!")
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basic.showLeds(`
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. . . . .
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. . . . .
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. . # . .
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. . . . .
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. . . . .
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`)
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```
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* **variable**: [read more...](/microbit/reference/variables/var)
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* **arithmetic operators**: [read more...](/microbit/reference/types/number)
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* **on button pressed** : [read more...](/microbit/reference/input/on-button-pressed)
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* **show number** : [read more...](/microbit/reference/basic/show-number)
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## Objectives
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* learn how to create a variable as a place where you can store data so that you can use it later in your code, accessible across all functions, and in nested code blocks
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* learn how arithmetic operators operate on numbers and return a number
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* learn how to run code when an input button is pressed
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* learn how to show a number on the LED screen, one digit at a time (scrolling from left to right)
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