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# flashing heart lesson plan
Learn how to create LED images with a variable.
### @video vimeo/134118661
## Topic
Global Variable - Blinking Images
## Class
Year 7
## Prior learning/place of lesson in scheme of work
Learn how to control a blinking LED image. We will be learning how to create a blinking app using global variables, forever as well as simple commands, such as create image, show image, pause, and clear screen.
## What the teacher needs to know
**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 program’s 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.**
**QuickStart Computing Glossary
## Documentation
* **global variables**: [read more...](/microbit/js/data)
* **create image** : [read more...](/microbit/reference/images/create-image)
* **show image** : [read more...](/microbit/reference/images/show-image)
* **pause**: [read more...](/microbit/reference/basic/pause)
* **clear screen**: [read more...](/microbit/reference/basic/clear-screen)
* **forever**: [read more...](/microbit/reference/basic/forever)
## Resources
* Activity: [tutorial](/microbit/lessons/flashing-heart/tutorial)
* Activity: [quiz](/microbit/lessons/flashing-heart/quiz)
* Extended Activity: [challenges](/microbit/lessons/flashing-heart/challenges)
## Objectives
* learn how to create a global variable
* learn how to blink a light
* learn how to repeat turning on and off the light
## Links to the National Curriculum Programmes of Study for Computing
## Assessment
### 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
## Activity
* time: 20 min.
* [tutorial](/microbit/lessons/flashing-heart/tutorial)
* [quiz](/microbit/lessons/flashing-heart/quiz)
* assessment opportunities: forever, plot, pause, clear screen
## Extended Activity
* time: 20 min.
* [challenges](/microbit/lessons/flashing-heart/challenges)
* assessment opportunities: loops, plot, pause, clear screen
## Homework
* Extended Activity: [challenges](/microbit/lessons/flashing-heart/challenges)
## Intended follow on
Publish script to the classroom.