1. BBC Microbit

2. Objective of the lesson
Use Block Editor to make a Windmill
All of you will:
Make a rotating windmill animation
Most of you will:
Make button A stop the windmill animation
Some of you will:
Make button B start the windmill animation

3. Windmill
We will create a windmill animation
Add a ‘forever’ loop
Add a series of LED images with short pauses between to show a rotating windmill

5. Now we will replace the forever with a ‘while True loop’
This lets the animation run as long as a condition is True

6. Create a new variable. Call it rotating. Set rotating to true
This means that this variable is ‘on’
Change the while ‘true’ to while ‘rotating’

7. Therefore whilst the variable ‘rotating’ is true (or on), then the program in the
while loop will run
Now add a ‘on button A pressed loop
Add in the rotating variable and set it to false
Now the variable ‘rotating’ is true (or on) and the windmill animation in the
while true loop runs
When the button A is pressed, the variable ‘rotating’ is false (or off) and the
windmill animation in the while true loop stops running

8. Challenge
Change the program so that button A stops the animation
Change the program so that button B starts the animation

9. Answers