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Computer Science teacher 20 years in school, college and University. Range of resources for all levels.

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Computer Science teacher 20 years in school, college and University. Range of resources for all levels.
Lossless and Lossy  compression : making an Emoji
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Lossless and Lossy compression : making an Emoji

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Activity to create a Disney emoji bitmap image in excel to consider file size in terms of number of pixels, number of colours ; bit depth and looks at how to use a compression technique to reduce fiel size. Includes an exam question on lossy and lossless compression.
Binary Search in Python a Simple practical explanation
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Binary Search in Python a Simple practical explanation

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This resource includes a python program with a commentary and guide that shows exactly the steps a Binary search. GCSE computer science students often find it difficult to understand Searching algorithms. So I have written as basic a program to help explain how it works with full details of how each line of the algorithm works.Includes trace table and code allowing each variable value to be printed as each line is executed.
Computer Security Crossword
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Computer Security Crossword

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Quck Crossword, created in Excel for students to answer in Excel. Summarises different types of Maware threats and techniques used to secure a computer system.
Year 7 or Year 8 Introduction to Operating Systems
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Year 7 or Year 8 Introduction to Operating Systems

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Used with Year 7 / 8 to introduce what an Operating Systems is. Uses image of a car dash to get them thinking about Operating systems / interfaces and how does the driver and the car communicate. Missing word activity that summarises learning from Car dash activity Looks at different kinds of software - Matching up activity All answers provided
Storing images - bitmaps resolution, bit depth, file size and file types
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Storing images - bitmaps resolution, bit depth, file size and file types

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A number of different worksheets covering how images are represented / stored digitally. Pixels, bit depth and calculating file size in bits and bytes. Includes practical activity for learners to create their own bitmap images including meta data. Used with Year 10 and 11 GCSE Computer Science Data Representation unit.
2.Using Tinkercad: Creating a Parking sensor for the Arduino and using For loops
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2.Using Tinkercad: Creating a Parking sensor for the Arduino and using For loops

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Resource shows how to build a circuit with leds, distance sensor and a buzzer using a breadboard and how to program using Arduino. Explains how distance ultrasound is used to measure distances in introduces a sequence of if statements to create a reverse parking sensor which uses sequence of lights and alternating tones from a buzzer to simulate a parking sensor using Tinkercad. Introduces for loops to control brightness of an led and changing the tone of a buzzer. Explains how Square waves can be used to output analogue data. Used for year 9 to make coding more engaging in preparation for choosing Computer Science at GCSE.
How Computers handle calculations : Binary Shift and Twos Compliment
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How Computers handle calculations : Binary Shift and Twos Compliment

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Worksheet that explains how computers are able to do calculations with negative numbers. Step by step explanation of 2s compliment is used, with easy to follow examples and practice questions. Worksheet that explains how Computers are able to do Multiplication and division, with easy to follow examples and practice questions.
1.Using Tinkercad : Create and program with Arduino - Traffic Light  and Knight Rider strobe
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1.Using Tinkercad : Create and program with Arduino - Traffic Light and Knight Rider strobe

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A tutorial ( part 1 &2) showing how to use Tikercad to create circuits and program with the Arduino Microcontroller. A fun introduction to programming can be used for Year 8 to 11 learners. Used to practise circuit bulding and programming before building their own circuits using leds, breadboard and Arduino connected via usb to their computer. Used with Year 9 to introduce electronics and programming. Lesson 1 : Controlling an led Lesson 2 : Creating a Traffic Light Simulation. Lesson 3 : Creating a strobe light effect - Knight Rider car Tinkercad is great simulation program , students learn quickly and then are much more confident at to being able to take the exported code and build their own circuits. Makes it much easier to manage a class of 25 Year 9s all doing practical.
Computer Storage devices : bits, bytes ,usb, hard and Solid State Drives properties
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Computer Storage devices : bits, bytes ,usb, hard and Solid State Drives properties

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A Crossword in Excel with Answers units of storage bits, bytes, KB,MB,GB,TB,PB and how to convert between them A missing word sheet comparing common storage devices - optical, magnetic, flash etc with answers A drag and drop game produced in Word matching up properties of Optical disk, Hard drive, Solid State, Flash dirve , FLoppy Disk Used with Year8, 9 and 10 Computer Science classes
Polymorphism and Inheritance  in Python- Shape animation
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Polymorphism and Inheritance in Python- Shape animation

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This is a difficult subject often briefly covered by having classes share some variables. These resources will help students understand the advantages of using classes with lots of practical activities. I use this activity with Btec level 3 students - Unit 15 Object Oriented Programming. and Foundation Degree Students, The resource Consists of a number of programs written in Python.
Data storage managing memory, data types and variables, real, long,floating point, byte,string
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Data storage managing memory, data types and variables, real, long,floating point, byte,string

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Resources for GCSE Computing course for the Data Representation topic. The Resource explains how different data is stored, so introducing data types and variables and shows how important it is to make sure the correct variables are selected by the programmer. Uses examples in Python and an excel program ( input form and vba coding) has been created for students to investigate for themselves, what can go if wrong data types for variables are chosen by the programmer. Overflow error, type Mismatch, rounding up errors, Validation etc.
Styling Websites :  Introduction to CSS (internal and external ) and how its used in websites.
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Styling Websites : Introduction to CSS (internal and external ) and how its used in websites.

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An introduction to how css can be used internal css to change style in a single webpages to external css to apply to whole websites. Simple explanation with source code and a style switcher - A CV page to show -off tech skills containing a clock animation created using flash actionscript and an iPhone with scrollable screen and interactive buttons using Javascript to allow users to switch styles to plain print view styled page. Shows why Cascading Style sheets are so important. Another example to show how websites can allow users to switch between large and small text. Excellent visual way to explain why websites must allow the user to customise websites in terms of colours, size of text, background images etc, or risk discriminating / isolating users using Cascading Stylesheets. Can be used for all levels.
Programming using Micro-electronics with Arduino microcontroller ( part 3 of 4)
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Programming using Micro-electronics with Arduino microcontroller ( part 3 of 4)

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Used in Year 8 and 9 to introduce Students to Computer Science and gets them away from standard software such as Python, Scratch. Great for cross -curricular links - Physics/Electronics/Programming/Technology. A set of resources that explains how to make programming more fun interactive using LEDs, Buzzers controlled by the Arduino micro-controller. Students are introduced to an Arduino circuit building simulator to practise how to create circuits using a breadboard and how to connect to Arduino and code to control their circuits. Includes : source code, circuit diagrams, and photographs of set ups and videos programs running. Information about how the Arduino works and where the best place to buy all the components you need. Also see my other resources designed in Tinkercad.