1. Global Challenge
Flashing Wheels
Lesson 2

2. Your challenge
Create a flashing wheel light solution for your user

3. Criteria
must be:
flashing light that can be easily attached to a wheel
appealing to your user
simple to use
inexpensive to make

4. Learning objectives:
to design a flashing wheel light solution to meet a user’s needs.
to create a paper prototype
to write a detailed, accurate algorithm using pseudocode
To include iteration, loops and selection in algorithms
To test and debug algorithms

5. User persona Sarah is 11 years old and a wheelchair user.
Her favourite colour is purple, her favourite band is The 1975 and her favourite animals are pandas.
She goes to school in Manchester and gets the bus most of the way.
She has to push herself, or a friend pushes her, to and from the bus into/out of school and she has to cross a fairly busy road.

6. Potential flashing wheel solution for Sarah:
small wheelchair light(s) that
are easily:
carried in her bag
attached to the wheels
turned on & off
replaced
flash (with adjustable speed)
automatically sense when is dark
can play her favourite music
are purple
have some kind of panda (sticker?) on them

7. 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

8. Paper Prototyping Draw your solution Give it a name
Annotate it with information about the device

9. Algorithm
a sequence of instructions or rules to solve a problem
written for a person to follow to write code
Pseudocode
A simple way of describing an algorithm
No specific syntax (programming language)

10. Sarah’s Flashing Wheels algorithm 1
START
Sense darkness level
IF dark then
OUTPUT light 1 second
pause 1 second
REPEAT
ELSE, REPEAT

11. Sarah’s Flashing Wheels Algorithm 2
When START button pressed
OUTPUT ‘on’ audio sound
INPUT Sense IF dark
IF dark then
OUTPUT light 1 second
Pause 1 second
Repeat until STOP button pressed
ELSE, do nothing
When STOP button pressed
OUTPUT ‘off’ sound
STOP

12. Iteration Loops Selection The repetition of a sequence
A form of iteration
repeat until a certain condition is met
Selection
a decision to be made according to whether a condition is met
If, then, else

13. Criteria
must be:
flashing light that can be easily attached to a wheel
appealing to your user
simple to use
inexpensive to make

14. Learning objectives:
to design a flashing wheel light solution to meet a user’s needs.
to decompose a problem into smaller, component parts
to create a paper prototype
to write a detailed, accurate algorithm using pseudocode
To include iteration, loops and selection in algorithms
To test and debug algorithms