138 lines
6.9 KiB
Markdown
138 lines
6.9 KiB
Markdown
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# offset image lesson
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shift an image horizontally across the display with offset #offset #image #docs
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### @video td/videos/offset-image-0
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## Topic
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**If** Conditionals
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## Quick Links
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* [tutorial](/microbit/lessons/offset-image/tutorial)
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* [quiz](/microbit/lessons/offset-image/quiz)
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* [quiz answers](/microbit/lessons/offset-image/quiz-answers)
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* [challenges](/microbit/lessons/offset-image/challenges)
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## Class
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Year 7
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## Prior learning/place of lesson in scheme of work
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Learn how to offset image with a conditional **If**, `if condition then` to run code depending on whether a condition is true or not. We will be learning how to offset image using a local variable, forever loop, the conditional If, input on button pressed, as well as simple commands, such as show string, create image and image show image.
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## What the teacher needs to know
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* Algorithm: An unambiguous set of rules or a precise step-bystep guide to solve a problem or achieve a particular objective.
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* Command: An instruction for the computer to execute, written in a particular programming language.
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* Computational thinking: Thinking about systems or problems in a way that allows computer systems to be used to model or solve these.
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* Data: A structured set of numbers, possibly representing digitised text, images, sound or video, which can be processed or transmitted by a computer, also used for numerical (quantitative) information.
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* Decomposing: The process through which problems or systems are broken down into their component parts, each of which may then be considered separately.
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* Hardware: The physical systems and components of digital devices; see also software.
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* Loop: A block of code repeated automatically under the program’s control.
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* Programmable toys: Robots designed for children to use, accepting input, storing short sequences of simple instructions and moving according to this stored program.
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* 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.
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* Repetition: Executing a section of computer code a number of times as part of the program.
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* Script: A computer program typically executed one line at a time through an interpreter, such as the instructions for a Scratch character.
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* Selection: A programming construct in which one section of code or another is executed depending on whether a particular condition is met.
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* Sequence: To place program instructions in order, with each executed one after the other.
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* Simulation: Using a computer to model the state and behaviour of real-world (or imaginary) systems, including physical or social systems; an integral part of most computer games.
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* Variables: A way in which computer programs can store, retrieve or change data, such as a score, the time left, or the user’s name.
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**QuickStart Computing Glossary
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## Documentation
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* ** global variables ** : [read more...](/microbit/js/data)
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* ** assignment operator ** : [read more...](/microbit/reference/variables/assign)
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* ** forever ** : [read more...](/microbit/reference/basic/forever)
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* ** If ** : [read more...](/microbit/reference/logic/if)
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* **show string** : [read more...](/microbit/reference/basic/show-string)
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* **create image** : [read more...](/microbit/reference/images/create-image)
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* **show image** : [read more...](/microbit/reference/images/show-image)
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* **on button pressed** : [read more...](/microbit/reference/input/on-button-pressed)
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## Resources
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* Activity: [tutorial](/microbit/lessons/offset-image/tutorial)
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* Activity: [quiz](/microbit/lessons/offset-image/quiz)
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* Extended Activity: [challenges](/microbit/lessons/offset-image/challenges)
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## Objectives
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* learn how to a create a global variable as a place where you can store and retrieve data, accessible across functions and in nested code blocks
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* learn how to set and change the value of a global variable
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* learn how to repeat code in the background forever
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* learn how to conditionally run code depending on whether a condition is true or not
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* learn how to show a string on the LED screen
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* learn how to create an Image to show on the micro:bit's LED screen
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* learn how to show an Image on the micro:bit's LED screen
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* learn how to run code when an input button is pressed
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## Links to the National Curriculum Programmes of Study for Computing
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## Progression Pathways / Computational Thinking Framework
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#### Algorithms
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* Designs solutions (algorithms) that use repetition and two-way selection, ie if, then and else.(AL)
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* Uses diagrams to express solutions.(AB)
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* Uses logical reasoning to predict outputs, showing an awareness of inputs (AL)
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* Designs solutions by decomposing a problem and creates a sub-solution for each of these parts. (DE) (AL) (AB)
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* Recognises that different solutions exist for the same problem (AL) (AB) Understands that iteration is the repetition of a process such as a loop (AL)
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* Represents solutions using a structured notation (AL) (AB)
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#### Programming & Development
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* Creates programs that implement algorithms to achieve given goals (AL)
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* Declares and assigns variables(AB)
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* Uses post-tested loop e.g.‘until’,and a sequence of selection statements in programs,including an if,then and else statement(AL)
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* Understands the difference between, and appropriately uses if and if, then and else statements(AL)
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* Uses a variable and relational operators within a loop to govern termination (AL) (GE)
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* Uses a range of operators and expressions e.g. Boolean, and applies them in the context of program control. (AL)
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* Selects the appropriate data types(AL) (AB
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#### Data & Data Representation
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* Uses filters or can perform single criteria searches for information.(AL)
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* Performs more complex searches for information e.g. using Boolean and relational operators(AL) (GE) (EV)
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* Defines data types: real numbers and Boolean (AB)
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#### Hardware & Processing
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* Knows that computers collect data from various input devices, including sensors and application software (AB)
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#### Communication Networks
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* Demonstrates responsible use of technologies and online services, and knows a range of ways to report concerns Understands how search engines rank search results (AL)
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#### Information Technology
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* Collects, organizes, and presents data and information in digital content (AB)
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* Makes appropriate improvements to solutions based on feedback received, and can comment on the success of the solution (EV)
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* Recognises ethical issues surrounding the application of information technology beyond school.
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Computational Thinking Concept: AB = Abstraction; DE = Decomposition; AL = Algorithmic Thinking; EV = Evaluation; GE = Generalisation
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## Activity
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* time: 20 min.
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* [tutorial](/microbit/lessons/offset-image/tutorial)
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* [quiz](/microbit/lessons/offset-image/quiz)
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## Extended Activity
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* time: 20 min.
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* [challenges](/microbit/lessons/offset-image/challenges)
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## Homework
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* Extended Activity: [challenges](/microbit/lessons/offset-image/challenges)
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## Intended follow on
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Publish script to the classroom.
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