49 lines
1.4 KiB
Markdown
49 lines
1.4 KiB
Markdown
# counter lesson
|
|
|
|
Learn how to create a counter with with on button pressed.
|
|
|
|
## Topic
|
|
|
|
Variables
|
|
|
|
## Quick Links
|
|
|
|
* [activity](/lessons/counter/activity)
|
|
* [challenges](/lessons/counter/challenges)
|
|
* [quiz](/lessons/counter/quiz)
|
|
* [quiz answers](/lessons/counter/quiz-answers)
|
|
|
|
## Prior learning/place of lesson in scheme of work
|
|
|
|
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.
|
|
|
|
## Documentation
|
|
|
|
```cards
|
|
input.compassHeading()
|
|
basic.forever(() => {})
|
|
let x = 0
|
|
if (true) {}
|
|
basic.showString("Hello!")
|
|
basic.showLeds(`
|
|
. . . . .
|
|
. . . . .
|
|
. . # . .
|
|
. . . . .
|
|
. . . . .
|
|
`)
|
|
```
|
|
|
|
* **variable**: [read more...](/reference/variables/var)
|
|
* **arithmetic operators**: [read more...](/reference/types/number)
|
|
* **on button pressed** : [read more...](/reference/input/on-button-pressed)
|
|
* **show number** : [read more...](/reference/basic/show-number)
|
|
|
|
## Objectives
|
|
|
|
* 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
|
|
* learn how arithmetic operators operate on numbers and return a number
|
|
* learn how to run code when an input button is pressed
|
|
* learn how to show a number on the LED screen, one digit at a time (scrolling from left to right)
|
|
|