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Automatic Pet DoorsAdding Safety and Convenience to Your Pet’s
Entrance
Automatic Pet DoorsAdding Safety and Convenience to Your Pet’s Entrance
Meet The Project Team
Zack Butler Andrew Hitchen Liz Drover Shanna Nolan
Automatic Pet DoorsAdding Safety and Convenience to Your Pet’s Entrance
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 DoorsAdding Safety and Convenience to Your Pet’s Entrance
• 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
Project Objectives
Automatic Pet DoorsAdding Safety and Convenience to Your Pet’s Entrance
Initial Design Review
•Weight activated sensors
• Tedious installation
• Difficult for weather proofing
• Obstructions created by door
Automatic Pet DoorsAdding Safety and Convenience to Your Pet’s Entrance
Early Revisions In Design
• Horizontally mounted stepper No longer attached to door
• Weather proofing
• Mounted sensors
• Battery operated
• Easy installation
• Eliminated obstructions
Automatic Pet DoorsAdding Safety and Convenience to Your Pet’s Entrance
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
Overview of Final System
Hardware
• Assorted Lumber
• ½” Wooden Dowel
• Vinyl Sheet
• Weather Stripping
• Rubber Matting
• Wires
• Terminal strips
• Various Fasteners
• Accessories
Electronics
• Normally open buttons
• Solenoid
• 6 x 1.5V D-Cell Batteries
• PIC 16F877 Microcontroller
• Lin Engineering Bi-Polar Stepper Motor
Software
• C-Language Code
• PIC Downloader
• Microchip MPLAB Project Builder
Automatic Pet DoorsAdding Safety and Convenience to Your Pet’s Entrance
Wiring Schematic
Programming Flowchart
Automatic Pet DoorsAdding Safety and Convenience to Your Pet’s Entrance
Demonstration
Automatic Pet DoorsAdding Safety and Convenience to Your Pet’s Entrance
Obstacles & Trade-Offs
Modeling of Motor
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.
Conclusions
Technical and Professional Skills Acquired
• Programming• Circuit design and wiring• Design for constructability• Organization and documentation
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
Automatic Pet DoorsAdding Safety and Convenience to Your Pet’s
Entrance
www.engr.mun.ca/~hitchenu