Transcript Electronics/Materials Development

Electronics/Materials
On-going
Development & Investigation
Materials
ABS-strong, durable
thermo-plastic so
recyclable. It will work in
my project because it is
easy to shape and will
hold the ps3s weight
Acrylic-strong, durable,
light, thermo plastic. It
will work in my project
because it is easy to
shape it will hold the
ps3 and it is light
PVC- cheap, durable,
thermo plastic. It will work
in my project because it
is easy to shape it will
hold the ps3 and it is
cheep
HIP- tough, rigid,
thermo plastic. It will
work in my project
because it is easy to
shape it will hold the
ps3 and it is cheep
Conclusion on this page I learnt that there are a
lot different thermo plastics and will be easy to
shape all the plastics will come in different colours
so I will be able to get the right one. I think PVC or
acrylic will be the best to use
Manufacturing techniques
Laser cutting easy to create box
shapes will be difficult to create
other shapes leaves minimal
waste
Vac forming can create a variety of
shapes however has to be a certain
size and produces a lot of waste and
moulds have to be made
Injection moulding can make lots of
shapes with minimal waste however
moulds have to be made and the
plastic has to be melted
Conclusion I think I should use a mix
between vac forming and laser cutting as they
are the most convenient and will work for my
design
Electronic Investigation/ Circuit Research
I have decided to use this premanufactured kit from Kitroniks
Circuit
diagram
Represents
motion sensor
CAD Modelling
This is he sides to my
finished product. The sides
fit perfectly. The grill that
you can see on the top left
of one of the sides is
where the speaker will go
and I have cut another grill
out on the opposite side
of the product because I
have 2 speakers.
This is one side with the grills in
close up. The rectangles that are
joined up are the ones being cut
out and it leaves thick lines with
holes in-between.
components
Low inertia motor x 4 to
power the fans also its
small enough to fit inside
the case
Thermistor so the fans
come on when the
playstation gets too hot so
they will only be on when
they need to be
5v colour changing LED to
make it look more stylish
Rectangular rocker switch so
I can turn the hole thing on
or of when not being used
12V UK mains wall power supply
in order to supply enough power
to my product in order to make it
work
CONCLUSION
On this page I
researched and found
out what would be the
best components to use
Investigation in electronics
Light switch project
board
Power boost
This is a light activated circuit
board that is available from
kitronik. It turns on when it goes
dark. I could use this in my
product. It includes all the
components that are needed.
The pack includes:
1 x 47Kohm potentiometer
2 x BC337 NPN transistors
1 x miniature LDR
(light dependent resistor)
1 x 220ohm resistor
1 x light activated switch PCB
This board only acts as
a light switch and will
need to be connected to
a project board
White 5mm wide angle LED
Forward voltage drop: 3.3 V
Viewing angle: 140 degrees
Max forward current: 30 mA
Luminous intensity:
3000 mCd
(@20mA)
Lens types:
Water clear
This is
information
about the
LEDs that I
will be using
I am using ultra bright
LEDs so they are bright
enough to light up the
desk. They are the wide
angle LEDs so they light
up a larger area.
To boost the power so I
can run more leds of the
light switch board.
The processor chip is
not included, but I can
use one from school.
The pack includes:
4 x 1Kohm resistors
3 x 10Kohm resistors
1 x 22Kohm resistor
1 x red low current LED
1 x green low current LED
1 x yellow low current LED
1 x BC337 NPN transistor
2 x PCB mount switches
1 x 3.5mm PCB mount jack socket
6 x two way terminal blocks
1 x 8 pin IC holder
1 x PP3 clip lead
1 x 3AA battery holder
1 x PIC development board PCB
This shows
what components/circuit
boards will be in the project,
thus giving an idea for how
large I will need to be to fit the
circuits in.
Development of final design
Joining of the plastic
LDR (light dependent resistor)/ photoresistor
I will use finger joints on the
laser cutter for the joints on this
design.
This image shows the
shape of an LDR.
This shows finger joints in use.
They can be used to join all
sorts of shapes together.
www.artifacturestudios.com
This is a close-up of a
finger joint. It shows how
the fingers interlock into
each other giving more
surface area for glue and a
tight fit. This is often used
in woodwork.
www.artifacturestudios.com
I drawn this on Google sketch up to show how the fingers interlock
to fit together. It shows how the fingers on one side have to be the
exact opposite of the one opposite to it on the other side in order for
it to fit together.
LDR
symbol
The resistance of a LDR is
usually high unless you illuminate
it. It will detect the light and
resistance will drop. This means
they can be used in light sensor
circuits for streetlights.
Battery cover
Cover that
opens.
I used a model from
school to show the
battery cover
Cover fixed by a
pivot through a hole.
Magnet to
keep the
door shut
would be
put here.
Finger joints cut
on the laser cutter
Stage 1
Stage 2
The digital clock would be a premanufactured digital watch taken
out the watch and put into my
product.
Stage 3
This shows how the top hinges
open witch in my model would
reveal the batteries.
This shows where the batterie
pack is located.
This is the list I produced
for items that need
to be brought to make
my product. It also
shows the cost of
each item and the total
cost to ensure the price
for materials does not exceed the budget.
Items cost list
item
Quantity
cost (based on buying 1 product)
suplier
white 5mm wide angle LED (10 in a pack)
1
£2.50 kitronik
8 pin PIC development board
1
£4.25 kitronik
light switch prodject board
1
£1.59 kitronik
blue perspex sheet 600x400mm
1
£4.50 kitronik
total
4
£12.84
The Perspex sheet it the
most expensive peace,
however the product
could not be made
without it.
Using the total cost
of the materials I
work out the final
price will be about
£15. this will give me
an idea of how much
it will cost evenually.