pxt-calliope/docs/lessons/smiley.md

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# smiley blocks lesson
Design a blinking image lesson
## Topic
Show LEDs
## Quick Links
* [activity](/lessons/smiley/activity)
* [quiz](/lessons/smiley/quiz)
* [quiz answers](/lessons/smiley/quiz-answers)
* [challenges](/lessons/smiley/challenges)
## Prior learning/place of lesson in scheme of work
Learn how to **show LEDs** to turn on a LED light pattern on the LED screen. We will be learning basic comments such as show LEDs and pause.
## Documentation
* **show LEDs** : [read more...](/reference/basic/show-leds)
* **on button pressed** : [read more...](/reference/input/on-button-pressed)
```cards
input.onButtonPressed(Button.A, () => {})
basic.showLeds(`
. . . . .
. . . . .
. . # . .
. . . . .
. . . . .
`)
```
## Objectives
* learn how to show LEDs on the LED screen
* learn how to run code when an input button is pressed