pxt-calliope/docs/reference/js/lessons/counter.md

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2016-03-26 00:47:20 +01:00
# counter lesson
Learn how to create a counter with with on button pressed. #show #number #screen #number #math #docs
### @video td/videos/counter-0
## Topic
Variables
## Quick Links
* [activity](/microbit/lessons/counter/activity)
* [challenges](/microbit/lessons/counter/challenges)
* [quiz](/microbit/lessons/counter/quiz)
* [quiz answers](/microbit/lessons/counter/quiz-answers)
* [tutorial](/microbit/lessons/counter/tutorial)
## Class
Year 7
## Prior learning/place of lesson in scheme of work
Learn how to creating a **variable** to keep track of the current count. We will be learning how to create a counter app using a variable as well as simple commands, such as on button pressed, and show number.
## Documentation
* **variable**: [read more...](/microbit/reference/variables/var)
* **arithmetic operators**: [read more...](/microbit/reference/types/number)
* **on button pressed** : [read more...](/microbit/reference/input/on-button-pressed)
* **show number** : [read more...](/microbit/reference/basic/show-number)
## Objectives
* learn how to create a variable as a place where you can store data so that you can use it later in your code, accessible across all functions, and in nested code blocks
* learn how arithmetic operators operate on numbers and return a number
* learn how to run code when an input button is pressed
* learn how to show a number on the LED screen, one digit at a time (scrolling from left to right)
## 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.
* [activity](/microbit/lessons/counter/activity)
* [tutorial](/microbit/lessons/counter/tutorial)
* [quiz](/microbit/lessons/counter/quiz)
## Extended Activity
* time: 20 min.
* [challenges](/microbit/lessons/counter/challenges)
## Homework
* Extended Activity: [challenges](/microbit/lessons/counter/challenges)