pxt-calliope/docs/reference/js/lessons/flashing-heart.md
2016-04-13 08:27:45 -07:00

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# flashing heart lesson
Learn how to create LED images with a global variable.
### @video td/videos/flashing-heart-0
## Topic
Pause
## Quick links
* [activity](/lessons/flashing-heart/activity)
* [quiz](/lessons/flashing-heart/quiz)
* [quiz answers](/lessons/flashing-heart/quiz-answers)
* [challenges](/lessons/flashing-heart/challenges)
* [tutorial](/lessons/flashing-heart/tutorial)
## Class
Year 7
## Prior learning/place of lesson in scheme of work
Learn how to **plot image** by turning on a series of LED lights on the LED screen. We will be learning how to create a blinking app using a forever loop as well as simple commands, such as plot image, pause, and clear screen.
## What the teacher needs to know / QuickStart Computing Glossary
**Program:** A stored set of instructions encoded in a language understood by the computer that does some form of computation, processing input and/or stored data to generate output.**
**Algorithm:** An unambiguous set of rules or a precise step-by-step guide to solve a problem or achieve a particular objective. The guided tutorial follows a algorithm and is a precise step-by-step guide to solve a problem**
**Loop:** A block of code repeated automatically under the programs control. ** The blink program introduces Forever. Forever will repeats code in the background forever.
**Command:** An instruction for the computer to execute, written in a particular programming language.**
## Documentation
* **forever**: [read more...](/reference/basic/forever)
* **plot image** : [read more...](/reference/led/plot-image)
* **pause**: [read more...](/reference/basic/pause)
* **clear screen**: [read more...](/reference/basic/clear-screen)
## Objectives
* learn how to repeat code in the background forever
* learn how to turn on a series of LED lights on the LED screen
* learn how to pause your code for the specified number of milliseconds
* learn how to turn off all the LED lights on the LED screen
## Progression Pathways / Computational Thinking Framework
#### Algorithms
* Understands that iteration is the repetition of a process such as a loop. (AL)
* Represents solutions using a structured notation. (AL) (AB)
#### Programming & Development
* Creates programs that implement algorithms to achieve given goals. (AL)
* Declares and assigns variables.(AB)
#### Data & Data Representation
* Understands the difference between data and information. (AB)
* Defines data types: real numbers and Boolean. (AB)
#### Information Technology
* Collects, organises and presents data and information in digital content. (AB)
* Makes appropriate improvements to solutions based on feedback received, and can comment on the success of the solution. (EV)
Computational Thinking Concept: AB = Abstraction; DE = Decomposition; AL = Algorithmic Thinking; EV = Evaluation; GE = Generalisation
## Exercise
* time: 20 min.
* [activity](/lessons/flashing-heart/activity) or [tutorial](/lessons/flashing-heart/tutorial)
* [quiz](/lessons/flashing-heart/quiz)
## Extended Activity
* time: 20 min.
* [challenges](/lessons/flashing-heart/challenges)
## Homework
* Extended Activity: [challenges](/lessons/flashing-heart/challenges)
## Intended follow on
Publish script to the classroom.