1. Global Challenge
A bag for Juliane
Lesson 2

2. A bag for Juliane
Design a bag for Juliane to use to help her feel safer when walking to and from school in the dark.

3. Requests from Juliane’s school
Please include at least:
a light device created with micro:bit to help Juliane ‘Be safe, be seen’
some reflective materials
some features that will make Juliane feel calm if she is feeling anxious
It should also be light and easy for Juliane to carry around

4. Learning objectives:
to complete a paper prototype of a bag to help Juliane feel safer walking to school
to take into account user requirements
to write, test and debug detailed, accurate and efficient algorithms including iteration, selection and variables

5. Prototyping An initial, basic version of an innovation.
It allows you to quickly and easily:
show how your innovation would work
test and trial it
get feedback
decide what works and what doesn’t

6. Paper Prototyping On large paper: Sketch your bag for Juliane
Add feature labels and explanations as to why they will help Juliane
Include a detailed, accurate algorithm for the computerised elements of your bag (pseudocode and/or flowchart)

7. Sample algorithm (flashing light)
INPUT when ON button pressed
INPUT ‘on’ sound
Start
INPUT Sense IF dark
IF dark then
INPUT Sense IF moving
If moving then
OUTPUT light 1 second
Pause 1 second
Repeat until STOP button pressed
ELSE, do nothing
When STOP button pressed
OUTPUT ‘off’ sound
STOP

8. Iteration Selection Variables
The repetition of a sequence. Loops are a form of iteration (repeat until a certain condition is met
Selection
a decision to be made according to whether a condition is met. e.g. If, then, else
Variables
used to store information, e.g. light level

9. Learning objectives:
to complete a paper prototype of a bag to help Juliane feel safer walking to school
to take into account user requirements
to write, test and debug detailed, accurate and efficient algorithms including iteration, selection and variables