BBC Micro:Bit

Lesson Objectives

To be able to: 

 

  • Understand how a while loop is used to repeat code forever.
  • Understand the use of indentation in code
  • Use IF statements in code

While Loops

What process do you repeat when you walk? 

One foot in-front of the other 

left foot up

left foot forwards

left foot down

right foot up 

right foot forwards 

right foot down

left foot up 

left foot forwards 

left foot down

Do we need to repeat every single instruction over and over and over again?

While Loops

left foot up

left foot forwards

left foot down

right foot up 

right foot forwards 

right foot down

left foot up 

left foot forwards 

left foot down

while walking:

    left foot up
    left foot forwards 
    left foot down
    right foot up
    right foot forwards
    right foot down

Instead of saying left and right and left and right ect., we can use a loop and only mention each foots process once

While Loops

How many times is this code going to show the happy face?

from microbit import *

display.show(Image.HAPPY)
sleep(1000)
display.show(Image.MEH)
sleep(1500)
display.show(Image.SAD)
sleep(1000)

While Loops

How many times will a happy face appear in this code?

from microbit import * 

while True: 
    display.show(Image.HAPPY)
    sleep(1000)
    display.show(Image.MEH)
    sleep(1500)
    display.show(Image.SAD)
    sleep(1000)

While Loops

How does the program know what code to repeat?

from microbit import * 

while True: 
    display.show(Image.HAPPY)
    sleep(1000)
    display.show(Image.MEH)
    sleep(1500)
    display.show(Image.SAD)
    sleep(1000)
display.show(Image.ASLEEP)

While Loops

from microbit import * 

while True: 
    display.show(Image.HAPPY)
    sleep(1000)
    display.show(Image.MEH)
    sleep(1500)
    display.show(Image.SAD)
    sleep(1000)
display.show(Image.ASLEEP)

When you write line of code with a colon, there MUST be at least one line of code beneath with an indent.

IF Statement

from microbit import * 

while True: 

    if button_a.is_pressed():
    	display.show(Image.HAPPY)
        
    elif button_b.is_pressed():
    	display.show(Image.MEH)
        
    else:
    	display.show(Image.SAD)

An IF Statement will check the condition of something before making a decision on what to do next.

When you first press run, what face will appear on your Micro:Bit?

IF Statement

from microbit import * 

while True: 

    if button_a.is_pressed():
    	display.show(Image.HAPPY)
        
    elif button_b.is_pressed():
    	display.show(Image.MEH)
        
    else:
    	display.show(Image.SAD)

An IF Statement will check the condition of something before making a decision on what to do next.

If you press button A, what face will appear?

IF Statement

from microbit import * 

while True: 

    if button_a.is_pressed():
    	display.show(Image.HAPPY)
        
    elif button_b.is_pressed():
    	display.show(Image.MEH)
        
    else:
    	display.show(Image.SAD)

An IF Statement will check the condition of something before making a decision on what to do next.

If you press button A and B, what face will appear?

IF Statement

from microbit import * 

while True: 

    if button_a.is_pressed():
    	display.show(Image.HAPPY)
        
    elif button_b.is_pressed():
    	display.show(Image.MEH)
        
    elif button_a.is_pressed() and button_b.is_pressed():
    	display.show(Image.PACMAN)
        
    else:
    	display.show(Image.SAD)

If you press button A and B, what face will appear?

Continue where you left off on Grok Learning

Activity

Complete the quiz in your Google Classroom

Plenary