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# flashing heart blocks lesson
Learn how to create LED images with a global variable. #LED #screen #plot #docs
### @video td/videos/flashing-heart-0
## Topic
Pause
## Quick links
* [activity ](/microbit/lessons/flashing-heart/activity )
* [quiz ](/microbit/lessons/flashing-heart/quiz )
* [quiz answers ](/microbit/lessons/flashing-heart/quiz-answers )
* [challenges ](/microbit/lessons/flashing-heart/challenges )
## Prior learning/place of lesson in scheme of work
Learn how to `show LEDs` by showing an image on the LED screen. We will be learning how to create a blinking app using a forever loop as well as simple commands, such as show LEDs, pause, and clear screen.
## Documentation
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```docs
basic.forever(() => {
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})
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basic.showLeds(`
. . . . .
. . . . .
. . # . .
. . . . .
. . . . .
`)
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basic.pause(100)
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basic.clearScreen()
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```
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## Objectives
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* learn how to repeat code in the background forever
* learn how to show LEDs on the LED screen
* learn how to pause your code for the specified number of milliseconds
* learn how to turn off all the LED lights on the LED screen
