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Open-Aid

Open-Aid. TEAM PRATHAM Team Leader: Matt Ryan Chief Engineer: Nick Martin Fabrication: Reed Langton CADCAM: Fraterno Vila Electronics/Control Engineer: Gabriel Letona. Outline. Problem Definition Product Requirements Operation Prototype Design Issues Strengths and Weaknesses

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Open-Aid

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  1. Open-Aid TEAM PRATHAM Team Leader: Matt Ryan Chief Engineer: Nick Martin Fabrication: Reed Langton CADCAM: Fraterno Vila Electronics/Control Engineer: Gabriel Letona AME470 Ltd. - Team Pratham

  2. Outline • Problem Definition • Product Requirements • Operation • Prototype • Design Issues • Strengths and Weaknesses • Budget Summary AME470 Ltd. - Team Pratham

  3. Problem Definition • Break the seal on jars and bottles without requiring the user to apply the torque necessary to open them AME470 Ltd. - Team Pratham

  4. Product Requirements AME470 Ltd. - Team Pratham

  5. Open-Aid • Ability to open a glass or plastic container • Uses a microprocessor with feedback from sensors to control the driving motors AME470 Ltd. - Team Pratham

  6. Prototype vs. Concept • Housing - Box vs. Cylinder • Height Adjustment • Fabricated bottom half AME470 Ltd. - Team Pratham

  7. Operation AME470 Ltd. - Team Pratham

  8. Sense top assembly contact switch Stop turning top assembly motor Plug in appliance Start turning bottom assembly motor Has bottom assembly contact switch been pressed? No Yes Press ‘start’ button Count to 1 second Hall effect sensor 2 senses magnet Does Hall effect sensor 1 still sense magnet? No Turn top assembly motor on Yes Stop bottom assembly motor and go to release operation Stop bottom assembly motor Programming (Opening Container) AME470 Ltd. - Team Pratham

  9. Reverse top assembly motor Sense top assembly hall effect sensor Stop top assembly motor Reverse bottom assembly motor Hall effect sensor 1 senses magnet Stop bottom assembly motor Programming (Releasing Container) AME470 Ltd. - Team Pratham

  10. The Prototype AME470 Ltd. - Team Pratham

  11. The Prototype • Sensors - Contact switches moved to breadboard Prototype Concept AME470 Ltd. - Team Pratham

  12. Design Issues • Torque Requirements • Motor Selection • Plate Design • Gripping Components • Electronics AME470 Ltd. - Team Pratham

  13. Torque Requirements AME470 Ltd. - Team Pratham

  14. Motor Selection Motor Selection: AME470 Ltd. - Team Pratham

  15. Gear Train • 6:1 gear ratio required to transmit operating torque with the Buehler DC motor • Stainless steel clamp hub gears from Berg • Clamps secure gear and pinion AME470 Ltd. - Team Pratham

  16. Grip Plate w/ Linear Grooves Plate w/ Spiral Grooves Plate Design Motor output results in the spinning of the Plate w/ Spiral Grooves, causing the Grip to move towards the center of the plates along the linear groove Grip rests at intersection of linear and spiral grooves Linear Groove Spiral Groove Convergence Angle Resulting Force on Grips from Spiral Groove AME470 Ltd. - Team Pratham

  17. Torque Key Gears Motor Torque Key Plate Design • Torque Key is fastened to the central shaft with a spring pin • Torque Key interlocks with Plate w/ Spiral Grooves AME470 Ltd. - Team Pratham

  18. Gripping Components • Concept – three gripping components consisting of a gripping arm riding in a slotted bracket, with a spring and contact switch • Inserts into spiral and radial plates Spiral Radial AME470 Ltd. - Team Pratham

  19. Gripping Components • Prototype – single unit with high-friction synthetic polymer pads • Problem – prototype slips on glass containers Radial Plate Spiral Plate AME470 Ltd. - Team Pratham

  20. Electronic Schematic AME470 Ltd. - Team Pratham

  21. Microcontroller System and Power Source • Minimax Microcontroller • Microprocessor PIC16F877A • Demands 6 to 12V DC • 100mA minimum current • Provides 5V • External Power Source • 120V AC from outlet • Use of an AC-DC adapter power source converter AME470 Ltd. - Team Pratham

  22. Container to Open Hall Effect Sensor Magnet 1 Housing Lower Plate Assembly Sensors • Magnetic Hall Effect sensors are used to control the rotation of the plates during the opening of the container AME470 Ltd. - Team Pratham

  23. Contact Switches Hall Effect Sensor & Magnet Sensors AME470 Ltd. - Team Pratham

  24. H-Bridge • 2 NMIH-0030 H-bridges • DC motor applications from 6 to 18 V up to 5 A current • Provides forward, reverse, and brake modes of operation. AME470 Ltd. - Team Pratham

  25. Strengths and Weaknesses AME470 Ltd. - Team Pratham

  26. Budget Summary • Most expensive components: - Large Gear $43.00 - H-Bridge $30.00 • Budget Available: $400.00 • Total Budget used: $338.00 • Budget Left: $62.00 AME470 Ltd. - Team Pratham

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