pxt-calliope/docs/lessons/strobe-light.md

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# strobe light lesson
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Learn how to create a blinking LED script.
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### @video td/videos/strobe-light-0
## Topic
For Loop
## Quick links
* [activity](/microbit/lessons/strobe-light/activity)
* [challenges](/microbit/lessons/strobe-light/challenges)
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* [quiz](/microbit/lessons/strobe-light/quiz)
* [quiz answers](/microbit/lessons/strobe-light/quiz-answers)
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## Documentation
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```cards
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led.plot(0, 0)
led.unplot(0, 0)
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for (let i = 0; i < 5; i++) {}
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basic.pause(100)
```
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## Objectives
* learn how to repeat code a fixed number of times
* learn how to turn on a LED light on the LED screen. Specify with LED using x, y coordinates
* learn how to turn off a LED light on the LED screen. Specify which LED which x, y coordinates
* learn how to pause program execution for the specified number of milliseconds