You must first complete Displaying Individual Pixels to OLED before viewing this Lesson

Basic Functions

Introduction

Now, we’re going to learn how to use functions: a way to execute a series of codes that we want to use multiple times without dragging the same blocks every time we need to use them. Think of functions as a shortcut of sorts! 

Components Needed

  • Little Python Brain
  • A tablet/phone/laptop
Steps

1

Setting variables

First up, we’re going to set up 2 variables: x and y.

Simply get two variable = value block from the Setup category. 

 

2

Setting x and y as variables

Change the first one to x = 64

Change the second to y = 32

3

Defining functions

Functions are a convenient way to execute a couple of lines of codes at once. We will make a function for showing the pixel on the screen. There are two elements to the f(x) block:

  • f – defines the name of the function
  • x – defines optional variable/s that a function will take

4

Setting the function

For now, we’ll just be renaming f to movePixel and removing the x. 

5

What to put inside the function

We will then move the oled blocks from last lesson and changing the oled.pixel() parameters back to x and y.

6

Calling the function

Finally, now that we set the function, we will call it. In order to call the function that we defined  from step 3, simply type in the name of the function. In this case, we can just call movePixel(). Run the code

The Complete Code

Run the code and note where the pixel is! In the next lesson, we’ll be using the touchpads to move the pixel around

Back to: Intermediate > Game Controller
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