Obj 1.1 …
1.
Receive the design challenge
2.
Describe user needs
Your Design Challenge
Design and build a portable pinhole camera to be used by people with disabilities.
Write this statement in your
engineering notebook.
Steps of the
Engineering Design Process
Engineers use a structured process to solve design problems.
Today we will look at the first two steps
1) Design Challenge
2) User Needs
When we design for people, we must think about…
What does the user need the product to do/be?
What does the user to use the product?
Let’s start with these.
User needs User actions
Describe User Needs
What
aspects of the camera design
does this affect?
On 4”x5” black and white film paper capture a single image of a 10’x10’
mural from a distance of no less
than 5’ and no more than 20’, filling the paper as much as possible
without cutting off the subject.
On 4”x5” black and white film paper capture a single image of a 10’x10’
mural from a distance of no less
than 5’ and no more than 20’, filling the paper as much as possible
without cutting off the subject.
Remember that light travels in straight lines.
Recall your notes on the camera obscura
What happens to the image as the camera is moved closer to the object?
Farther from it?
The image in the camera
changes with camera distance.
What if the camera stays still and the film paper moves inside the camera?
You could design the camera to have film you move so as to calculate where to put the film based on your distance from the object.
The image in the camera
changes with film position.
Imagine the car is your 10x10’
mural
Which dimensions of the mural matter?
10’
5’
10’
Imagine the car is your 10x10’
mural
You must stand 5’-20’ away to take the picture.
Where should your film go inside your camera?
Camera
Subject
Film Placement Calculation
What do calculations for film placement look like?
10’
Film length
4”
Car length Camera Distance
5’ < d≤ 20’
Film Placement Calculation
Keep in mind we must fit 10’ height and 10’ length onto 4” height and 5” length film.
10’
Film height
4”
Car height
Camera Distance 5’ < d≤ 20’
Film Placement Calculation
Geometric model using similar triangles and proportionality
Film Placement Calculation
User needs require your pinhole camera to fit a picture of a 10’x10’ mural onto 4”x5” film without cutting off any of the mural. You must also stand between 5’ and 20’ away from the mural.
Calculate how far the film must be place from the pinhole in your camera so as to take pictures at 5’, 20’, and two distances in between.
How do these calculations influence the design of your camera?
I am going to check your Engineering binders for the following:
Design Challenge
User Needs
Film Placement Calculation
Be sure your name is clearly marked somewhere on your organized 3-ring binder.
Leave your binders on the top shelf.
Notebook Check
What’s Next?
They tell us what the user needs the product to do/be.
They tell us what the user has to do to use the product.
We’ll continue to explore user needs…
User needs User actions
… which will make us look at user actions.
