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Mechanical Design of the Wild Game
This section explain the mechanical
design of the game and also include the Bill of Material (BOM) for
building this Wild Game.
Main Back Plate
The back plate is made from acrylic
(2’x3’) and laser cut to the desired shape. Before the actual cut was made, the
back plate was designed in AutoCAD and a mockup 1:1 printout was created
to check the function of the game.
Figure
1
AutoCAD plot of the back plate
DXF file of the back plate for laser cut is
available in download section.
Copper tape
& Stick
Copper tape running
along the edge of the slots is used to sense when the player’s stick
touch the edge. The stick is
always hi (+5V) and the C32 always senses input from the copper tape.
 
Figure 2
Copper Wire running along the edges
Figure 3
Stick, notice the vibrate motor at the bottom
DXF file of the stick for laser cut is available
in download section.
Spinning Motor
The direction and
the speed of the spinning motors are controlled according to the level of
difficulty that the player chooses.
Notice the slip
ring design used on the spinning motors, hence, the game could
sense even if the player touch the spinning wheels!
Figure
4
The spinning wheels
Figure
5
Slip Ring behind the spinning wheel
DXF file of the back plate and the spinning
wheel are available in download section.
Passing Points
The C32 detect when
the player pass each stage by using IR LED and 3208E Phototransistor.
Figure
6
Notice the LED and 3208E next to the solenoids
Solenoid
Solenoids will open the gate for 3 seconds after the
player pass the first passing point (IR LED and 3208E). If the player could not pass this
solenoids gate within 3 seconds, the gate will close. Player will have to go back to the
first passing point again to activate the solenoid.
SWAG (Stuff Won in the Arcade Game)
The arcade
will dispense a reward to the player who perform well within the context
of the game’s theme. A player who
accomplishes the game in a given time will receive a couple of Jelly
Belly’s (candy) as a reward.
Figure
7
The shape of SWAG
A servo motor
is attached on the bottom of a plastic container and the plate will swing
as the motor operates. The container is tilted and mounted on the door so
that the candy could be dispensed through the below funnel easily.
Figure
8
Candy Container
Players will collect the candies from the container
after the game.
Bill of Material (BOM)
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Item
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Description
|
Qty
|
Cost($)
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Solenoid
|
|
4
|
8.00
|
|
Channel Driver
|
L293B
|
1
|
2.25
|
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Circuit Board
|
|
5
|
7.00
|
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Phototransistor
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LTR3208E
|
4
|
2.00
|
|
Shift Resistor
|
74HC164
|
1
|
0.45
|
|
MOSFET
|
IRLZ34N
|
1
|
0.80
|
|
Socket
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16 pins
|
10
|
4.50
|
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Cable
|
|
1
|
2.45
|
|
Motor Sockets
|
|
5
|
1.05
|
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LED
|
|
8
|
2.00
|
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IR LED
|
|
4
|
1.40
|
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Acrylic Sheet
|
For Back Board
|
1
|
24.25
|
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Connectors
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LED (Numeric)
connectors
|
|
2.00
|
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Display LED
|
|
3
|
10.05
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Cooper Tape
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Conductive game path
|
1
|
16.47
|
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Vibrating Motor
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For the Handle stick
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1
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3.00
|
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Programmable peripheral
interface
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|
2
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4.49
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Servo Motor
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|
1
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16.95
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Buzzer
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85dB, 2048 Hz
|
1
|
2.09
|
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Hinges
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|
2
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4.87
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Plastic Box
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SWAG cradle
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1
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2.11
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Power Switch
|
|
1
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3.28
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Wood Sheets
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Masonite for Arcade
Frame
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4
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21.51
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Misc. Fasteners
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28.96
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Total
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$171.93
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The total construction cost of this
penny arcade exceeds the allowed budget by small amount. While individual
cost of some items was relatively high, most of the expenses came from
the cheaper items where large quantity was used. The most unexpected high
cost item turned out to be the fasteners, followed by acrylic and wood
sheet. If the team realized the cost of these items earlier, more effort
would be expanded in minimizing the use of these components.
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