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# flashing heart blocks lesson
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Learn how to create LED images with a global variable.
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## Topic
Pause
## Quick links
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* [activity ](/lessons/flashing-heart/activity )
* [quiz ](/lessons/flashing-heart/quiz )
* [quiz answers ](/lessons/flashing-heart/quiz-answers )
* [challenges ](/lessons/flashing-heart/challenges )
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## 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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```cards
basic.forever(() => {})
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basic.showLeds(`
. . . . .
. . . . .
. . # . .
. . . . .
. . . . .
`)
basic.pause(100)
basic.clearScreen()
```
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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
