# 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