A utomatic P et D oors Adding Safety and Convenience to Your Pet’s Entrance

1. Automatic Pet Doors Adding Safety and Convenience to Your Pet’s Entrance

2. Meet The Project Team Zack Butler Andrew Hitchen Liz Drover Shanna Nolan Automatic Pet Doors Adding Safety and Convenience to Your Pet’s Entrance 

3. Abstract – Introduction • Problem to be Solved • Millions of homes in North America have pets which require a route • in and out of the home for various reasons • Existing pet doors have flaws that we have endeavoured to • overcome with our design Automatic Pet Doors Adding Safety and Convenience to Your Pet’s Entrance 

4. Project Objectives • System will allow the pet to independently open the door for • entering and exiting the home • System must be able to lock when not in use • System must fit in the dimensions of a standard exterior door • System must be internally powered by batteries • System must be aesthetically appealing Automatic Pet Doors Adding Safety and Convenience to Your Pet’s Entrance 

5. Initial Design Review • Weight activated sensors • Tedious installation • Difficult for weather proofing • Obstructions created by door Automatic Pet Doors Adding Safety and Convenience to Your Pet’s Entrance 

6. Early Revisions In Design • Horizontally mounted stepper • No longer attached to door • Weather proofing • Mounted sensors • Battery operated • Easy installation • Eliminated obstructions Automatic Pet Doors Adding Safety and Convenience to Your Pet’s Entrance 

7. Final Design • 12” x 15” pet door dimensions • Spring loaded solenoid lock • Door locks when system is off • Easy access for battery replacement • Weather proofed Automatic Pet Doors Adding Safety and Convenience to Your Pet’s Entrance 

8. Overview of Final System • Hardware • Assorted Lumber • ½” Wooden Dowel • Vinyl Sheet • Weather Stripping • Rubber Matting • Wires • Terminal strips • Various Fasteners • Accessories • Software • C-Language Code • PIC Downloader • Microchip MPLAB • Project Builder • Electronics • Normally open buttons • Solenoid • 6 x 1.5V D-Cell Batteries • PIC 16F877 Microcontroller • Lin Engineering Bi-Polar • Stepper Motor

9. Wiring Schematic Automatic Pet Doors Adding Safety and Convenience to Your Pet’s Entrance 

10. Programming Flowchart

11. Demonstration Automatic Pet Doors Adding Safety and Convenience to Your Pet’s Entrance 

12. Obstacles & Trade-Offs Automatic Pet Doors Adding Safety and Convenience to Your Pet’s Entrance 

13. Modeling of Motor

14. Recommendations • A microcontroller circuit designed specifically for a stepper • motor would take up less space. This would allow better fit into a • standard exterior door. • A stepper motor with smaller dimensions and more torque would • completely fit inside an exterior door, while being able to lift a • pet door that was made of a heavier, sturdier material. • Place bearings on the contact points of the lifting shaft. This would maintain adequate support, but would facilitate motor rotation with less friction, thereby increasing efficiency of the system.

15. Conclusions • Goals Accomplished • Designed a pet door system that allows a pet to independently enter and • exit the home by touching a sensor pad with their paw • The system was implemented within the standard dimensions of an • exterior door • The system features a lock for safety and security • Technical and Professional Skills Acquired • Programming • Circuit design and wiring • Design for constructability • Organization and documentation

16. Automatic Pet Doors Adding Safety and Convenience to Your Pet’s Entrance www.engr.mun.ca/~hitchenu