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# rotation animation block lesson
Learn how to create images with a global variable and while loop. #LED #screen #plot #docs
## Topic
While Loop
## Quick links
* [activity ](/microbit/lessons/rotation-animation/activity )
* [challenges ](/microbit/lessons/rotation-animation/challenges )
## Class
Year 7
## Prior learning/place of lesson in scheme of work
Learn how to create images that look like a rotating animation by using a while loop. We will be learning how to create a rotating animation using a global variable, while loop as well as simple commands, such as on button pressed and show animation.
## Documentation
2016-03-30 01:17:34 +02:00
```docs
let x = 0
input.onButtonPressed(Button.A, () => {
})
basic.showLeds(`
. . . . .
. . . . .
. . # . .
. . . . .
. . . . .
`)
basic.pause(100)
while (true) {
basic.pause(20)
}
```
2016-03-26 00:47:20 +01:00
## Objectives
* learn how to create a global variable for a place where you can store data, accessible across functions, and in nested code blocks
* learn how to set or change the value of a global variable
* learn how to repeat code while a condition is true
* learn how to declare a global boolean variable to determine which code will execute next
* learn how to run code when an input button is pressed
* learn how to show a series of image frames on the LED screen
* learn how to pause your code for the specified number of milliseconds
