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# looper blocks lesson
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Learn to control blinking LEDs.
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## Topic
For Loop
## Quick links
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* [activity ](/lessons/looper/activity )
* [challenges ](/lessons/looper/challenges )
* [quiz ](/lessons/looper/quiz )
* [quiz answers ](/lessons/looper/quiz-answers )
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## Class
Year 7
## Prior learning/place of lesson in scheme of work
Learn how to control a blinking LED. We will be learning how to create a blinking app using the for loop as well as simple commands, such as plot and pause.
## Documentation
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```cards
for (let i = 0; i < 5 ; i + + ) { }
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basic.showNumber(0)
basic.pause(100)
```
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## Objectives
* learn how to repeat code a fixed number of times
* learn how to show a number on the LED screen, one digit at a time (scrolling from left to right)
* learn how to pause program execution for the specified number of milliseconds
* learn how to arithmetic operators operate on numbers and return a number
