pxt-calliope/olddocs/lessons/looper.md
Tom Ball f4eca66648 move lessons out of web site
will move select lessons back to "educators" section
2016-06-14 11:49:58 -04:00

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Markdown

# looper blocks lesson
Learn to control blinking LEDs.
## Topic
For Loop
## Quick links
* [activity](/lessons/looper/activity)
* [challenges](/lessons/looper/challenges)
* [quiz](/lessons/looper/quiz)
* [quiz answers](/lessons/looper/quiz-answers)
## 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
```cards
for (let i = 0; i < 5; i++) {}
basic.showNumber(0)
basic.pause(100)
```
## 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