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