a utomatic p et d oors adding safety and convenience to your pets entrance
TRANSCRIPT
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Automatic Pet DoorsAdding Safety and Convenience to Your Pet’s
Entrance
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Automatic Pet DoorsAdding Safety and Convenience to Your Pet’s Entrance
Meet The Project Team
Zack Butler Andrew Hitchen Liz Drover Shanna Nolan
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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
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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
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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
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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
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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
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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
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Automatic Pet DoorsAdding Safety and Convenience to Your Pet’s Entrance
Wiring Schematic
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Programming Flowchart
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Automatic Pet DoorsAdding Safety and Convenience to Your Pet’s Entrance
Demonstration
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Automatic Pet DoorsAdding Safety and Convenience to Your Pet’s Entrance
Obstacles & Trade-Offs
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Modeling of Motor
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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.
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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
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Automatic Pet DoorsAdding Safety and Convenience to Your Pet’s
Entrance
www.engr.mun.ca/~hitchenu