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Introduction to Computer Science Principles byDesign

Unit 1: Computer Science Principles byDesign

Learning Cycle2 : Using Variables and Functions (Microbit)

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Big Idea

In this presentation we will learn how to use variables and functions in programming the microbit to solve engineering problems.

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What is a variable?

  • In programming a variable is a name that refers to a value.
  • If we ask microbit to evaluate the value of a variable , it will produce the value that is currently linked to the variable.

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When we create a variable, we can:

  • Initialize the variable: assign an initial value,
  • add /subtract into or from the current value of the variable
  • show the current value of the variable
  • plug the variable in any mathematical expression
  • creating a variable

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Initializing a Variable

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Incrementing a Variable by 1

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Showing/displaying the current value of the variable

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Using variable in math operations

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Your turn:

Create two variables that can be updated and the current values shown in the microbit display when a button is pressed.

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Functions

  • A function is a command or set of commands that can be used in different part of the program.
  • A function is executed when it is called in any part of the program.
  • Built in functions
  • You can make your own function

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Examples of built-in function

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The function block

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Naming the function

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Naming a function

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Functions must be called to be executed.

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Functions can be with/without parameters (Input)

Function without parameter

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Functions can be with/without parameters (Input)

Function with parameter

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For movements, utilize the servo simulation

    • Use the “servo write” block from the “pins” palette.

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Your turn:

    • Create two functions with parameter (number inputs).
    • Each function will execute a unique move or display.

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