University of Notre Dame AME 470 Ltd.
Team Unum
Critical Design Review
7 December 2004
AME 470 – Team Unum
Team Unum Structure
Team Leader: Frankie Bott
Chief Engineer: Jose Viso
CAD Engineer: Jim Hyde
Fabrication Engineer: Tim Culbertson
Controls/Electronics: Chris Tilton
7 December 2004
AME 470 – Team Unum
Solving the Problem of
Accurate Inflation:
• The objective of the Aura Valve is to aid in
accurate inflation of athletic balls and
bike/automobile tires.
• By applying control technology to this task,
the Aura Valve eliminates the guess-work
involved in the inflation process.
• The Aura Valve can be used with existing
inflatables and air sources, which makes it a
truly user-friendly and universal tool.
7 December 2004
AME 470 – Team Unum
Overview of the Aura Valve
• Electrical Subassembly
– Sensing and Control of Airflow
• Mechanical Subassembly
– Physical movement of air from source to
inflatable
• User Interface
– Customizable to the needs of the user, as well
as displaying the status of the inflation
process
7 December 2004
AME 470 – Team Unum
Design Requirements
• Pressure Range
– Input: 0-80 psi
– Output: 0-65 psi
• Standard ¼” internal connections
• Standard external connections to inflatable and air
supply
• Weight: less than 3 pounds
• Volume: 7” X 4.5” X 5”
• User interface
7 December 2004
AME 470 – Team Unum
Electronic Subassembly
7 December 2004
AME 470 – Team Unum
Solenoid Valve
•
•
•
•
•
ASCO Valve
Model P/N 8320G184
12 Volts DC
400 mA current
0-115 psi
I/O Pin
MiniMAX
Vcc (5 V)
Diode
Solenoid
Relay
Transistor
Power
Ground
7 December 2004
AME 470 – Team Unum
Pressure Sensing
Motorola MPX5700GP-ND
Req’d Voltage: 5 V
Accuracy: 0.5%
Pressure Range: 0-101.5 psi
Weight: <7 Oz.
MiniMAX
•
•
•
•
•
Connection
to system
Vcc (5 V)
Transducer
I/O Pin
Transducer
Ground
7 December 2004
AME 470 – Team Unum
Mechanical Subassembly
7 December 2004
AME 470 – Team Unum
User Interface
7 December 2004
AME 470 – Team Unum
Control Logic
{MiniMAX is connected to power}
• If ENTER button is pressed
– Prompt user for desired pressure
– Begin reading pressure data from transducer
– Display target pressure and current pressure
{User enters pressure value with pushbuttons}
• If current pressure < target pressure
– Activate relay
MiniMax
{Relay turns on solenoid and the vessel begins inflating}
• If current pressure = target pressure or KILL button is pressed
– Turn off relay
{Relay turns off solenoid, vessel stops inflating}
• If ANY button is pressed
– Restart the program from the beginning
7 December 2004
AME 470 – Team Unum
Housing
7 December 2004
AME 470 – Team Unum
Cost of Prototype Development
Team Unum Accounting
Date Ordered Date Rec'd
7-Oct-04
12-Oct-04
13-Oct-04
26-Oct-04
12-Oct-04
15-Oct-04
12-Oct-04
15-Oct-04
12-Oct-04
15-Oct-04
12-Oct-04
15-Oct-04
12-Oct-04
15-Oct-04
12-Oct-04
15-Oct-04
12-Oct-04
15-Oct-04
12-Oct-04
15-Oct-04
12-Oct-04
15-Oct-04
26-Oct-04
30-Oct-04
26-Oct-04
30-Oct-04
26-Oct-04
27-Oct-04
26-Oct-04
27-Oct-04
26-Oct-04
27-Oct-04
26-Oct-04
27-Oct-04
5-Nov-04
10-Nov-04
10-Nov-04
12-Nov-04
12-Nov-04
12-Nov-04
12-Nov-04
12-Nov-04
12-Nov-04
12-Nov-04
12-Nov-04
12-Nov-04
12-Nov-04
12-Nov-04
12-Nov-04
12-Nov-04
12-Nov-04
12-Nov-04
12-Nov-04
12-Nov-04
28-Oct-04
3-Nov-04
15-Nov-04
23-Nov-04
23-Nov-04
23-Nov-04
Most Expensive
Component:
Description
Part ID
Pressure Sensor
Motorola MPX5700GP-ND
Solenoid Valve
8320G184 Asco
Parallel LCD, 20x4
277376
Pushbutton (6)
26622
Switch, SLD
202972
Heat Sink (2)
158051
Jack, DC, Male, 2.1 mm
101178
Plug, DC, Female, 2.1 mm
138587
Plug, DC, Female, 2.1 mm
147328
Plug, DC, Female, 2.5 mm
147336
AC/DC Converter, 24 V
102285
AC/DC Converter, 12 V
15368
Relay, 5 V
106462
PVC Multipurpose Airhose
Parker 49697808
Female NPTF Hose Barbs
Parker 79870606
Worm-Drive Clamps SAE 8
Tridon 48706097
Male NPTF Hose Barbs
Parker 79870002
Smart Head Valve
5/8" Dia 2011 Aluminum Stock
88615K31
25' 0.25" Polyethylene Tubing
Teflon Tape
Female Pipe Tee
1/8" Barb Male Fitting
3/16" Barb Male Fitting
1.5" Brass Pipe Nipple
Close Brass Pipe Nipple
1/4" Pipe Clamps
LCD 242
705
FDM Housing Shells
Fasteners
Solenoid Valve ($89)
Electronic
Components: $56
Hosing and Fittings:
$25
Totals
7 December 2004
Company
Price
S/H
www.Digikey.com $18.19 $8.39
Coastal Supply
$84.50 $0.00
Jameco
$23.29 $8.93
Jameco
$3.30 $0.00
Jameco
$0.20 $0.00
Jameco
$0.78 $0.00
Jameco
$0.49 $0.00
Jameco
$0.79 $0.00
Jameco
$0.69 $0.00
Jameco
$0.75 $0.00
Jameco
$7.95 $0.00
Jameco
$6.49 $6.94
Jameco
$2.15 $0.00
MSC
$1.56 $0.00
MSC
$2.04 $0.00
MSC
$4.10 $0.00
MSC
$3.76 $0.00
Topeak
$14.95 $5.00
McMaster
$15.50 $4.00
Lowe's
$1.70 $0.00
Lowe's
$2.63 $0.00
Lowe's
$1.99 $0.00
Lowe's
$2.96 $0.00
Lowe's
$0.89 $0.00
Lowe's
$0.79 $0.00
Lowe's
$0.59 $0.00
Lowe's
$1.41 $0.00
BiPom
$24.95 $10.00
ND CAM
$70.00 $0.00
Lowe's
$0.70 $0.00
Initials
FMB
JRV
CJT
CJT
CJT
CJT
CJT
CJT
CJT
CJT
CJT
CJT
CJT
JJH
JJH
JJH
JJH
JJH
TDC
TDC
TDC
TDC
TDC
TDC
TDC
TDC
TDC
CJT
TDC
TDC
Paid By
Frankie
donation
Chris
Chris
Chris
Chris
Chris
Chris
Chris
Chris
Chris
Chris
Chris
Jim
Jim
Jim
Jim
Jim
Tim
Tim
Tim
Tim
Tim
Tim
Tim
Tim
Tim
Chris
ND
Tim
Housing Fabrication:
$70
Total Costs
$343.35
Parts
S/H
Total Costs
$300.09 $43.26 $343.35
AME 470 – Team Unum
Working Prototype
LCD
displays
instructions
and status
for user
interface
Buttons
allow user
to operate
the Aura
Valve
Inflatable
connected
to Aura
Valve
through the
Smarthead
7 December 2004
Air Source
is
connected
to the Aura
Valve
AME 470 – Team Unum
Prototype Strengths and
Weaknesses
• Strengths:
• Weaknesses:
– User friendly
– Consistent
performance
– Functionality
– Proof of Concept
– Compatibility/
Universality
7 December 2004
AME 470 – Team Unum
– Cost
– Size
– Portability
– Weight
– Robustness
From Prototype to Product
• Improved Portability
– Reduction of Size
– Ergonomic Design
– Rechargeable Battery
7 December 2004
•Improved Robustness
–Withstand a drop of 5 feet
–Waterproof for use in all
weather conditions
AME 470 – Team Unum
Thank You for your Attention!
Any questions?
7 December 2004
AME 470 – Team Unum