Critical Design Review

1. University of Notre Dame AME 470 Ltd. Team Unum Critical Design Review AME 470 – Team Unum

2. Team Unum Structure Team Leader: Frankie Bott Chief Engineer: Jose Viso CAD Engineer: Jim Hyde Fabrication Engineer: Tim Culbertson Controls/Electronics: Chris Tilton AME 470 – Team Unum

3. 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 applyingcontrol 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. AME 470 – Team Unum

4. 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 AME 470 – Team Unum

5. 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 AME 470 – Team Unum

6. Electronic Subassembly AME 470 – Team Unum

7. MiniMAX Solenoid Vcc (5 V) I/O Pin Relay Diode Transistor Power Ground Solenoid Valve • ASCO Valve • Model P/N 8320G184 • 12 Volts DC • 400 mA current • 0-115 psi AME 470 – Team Unum

8. Transducer Vcc (5 V) MiniMAX I/O Pin Ground Pressure Sensing • Motorola MPX5700GP-ND • Req’d Voltage: 5 V • Accuracy: 0.5% • Pressure Range: 0-101.5 psi • Weight: <7 Oz. Connection to system Transducer AME 470 – Team Unum

9. Mechanical Subassembly AME 470 – Team Unum

10. User Interface AME 470 – Team Unum

11. 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 {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 MiniMax AME 470 – Team Unum

12. Housing AME 470 – Team Unum

13. Cost of Prototype Development Most Expensive Component: Solenoid Valve ($89) Housing Fabrication: $70 Electronic Components: $56 Hosing and Fittings: $25 AME 470 – Team Unum

14. Working Prototype Air Source is connected to the Aura Valve LCD displays instructions and status for user interface Buttons allow user to operate the Aura Valve Inflatable connected to Aura Valve through the Smarthead AME 470 – Team Unum

15. Prototype Strengths and Weaknesses • Strengths: • User friendly • Consistent performance • Functionality • Proof of Concept • Compatibility/ Universality • Weaknesses: • Cost • Size • Portability • Weight • Robustness AME 470 – Team Unum

16. From Prototype to Product • Improved Portability • Reduction of Size • Ergonomic Design • Rechargeable Battery • Improved Robustness • Withstand a drop of 5 feet • Waterproof for use in all weather conditions AME 470 – Team Unum

17. Thank You for your Attention! Any questions? AME 470 – Team Unum