1. Bark Activated Dog Door
Miles
Miles Cernauskas, Devraj Banerjee, Ryan Madigan

2. Introduction Convenient system to let dog out when away from home
Safe from intruders
Safe for dog
Miles

3. Outline Project Overview Modular Design Design Layout
Circuit/Logic Design
Design Changes
Requirements and Verification
Design Layout
Ethical Considerations
Future Improvements
Summary
Questions
Miles

4. Overview Detects object in front of door Detects a dog bark
Takes Pictures of both sides of door
Tweets alert of dog and link to server
Web server displays pictures and contains button to operate the door
Motor will open and close door
Line trip sensor detects object in doorway
Devo

5. Modular Overview
Devo

6. Distance Sensor Used to determine when dog is close to door
Activates microphone dog bark detection
Requirement
Accurately measures distance in front of door
Verification
Read serial monitor output, compare to known distance
Devo
Ultrasonic trigger and echo that measures time for pulse to send and receive to calculate distance. Range to 500 cm.
Must receive 10 readings under 50 cm to activate microphone

7. Dog Bark Detection Goal: keep system safe from potential intruders
Requirement
Keep false positives to a minimum
Dog bark is successfully detected
Verification
Human speech, loud noises, and other animal sounds do not generate positive dog bark detection
Dog bark sample does generate positive dog bark detection
Ryan

8. Microphone
Ryan
Basic non-inverting amplifier circuit using Ti TL071 and DC offset to produce Arduino readable input

9. Arduino FFT Pure Data Visualizer
Performed FFT on incoming audio signal
~40Hz to 22 kHz range
44.1 kHz sampling rate
Amplitude
Ryan
Frequency Bin

10. Digital Signal Processing
Ryan
Frequency range: ~43 Hz—22 kHz. 44.1kHz sampling rate=most common in digital audio. Audible range for humans is 20Hz—20kHz.

11. Cameras
Provide pictures of inside and outside of door for security purposes
Requirement
Take pictures
Store on SD Card
Verification
Pictures are on SD Card
Devo
Serial TTL Cameras capable of constant video. To minimize cost and time less powerful cameras. Or video feed cuz it’s the shit.

12. Twitter Used to notify user of dog waiting at door
Contains link to web server
Requirement
Send tweet
Verification
Check twitter account
Miles

13. Web Server Requirement Verification Accessible via IP address
Miles
Requirement
Accessible via IP address
Displays images
Functional open and close
Verification
Server is accessible
Action buttons generate response

14. Motor Requirements Verifications Brushed DC Motor Arduino Motor Shield
12V, 2A power source
Requirements
Motor opens and closes door
Switches stop door at both ends
Line sensor detects obstruction
Verifications
Motor moves proper direction
Door stops when switch is pressed
Door stops when laser line is broken
Ryan
Design change: rotary encoder to snap action switch
Problems: Logic in code caused us to break sensors

15. Line Trip Sensor Ensure safety of dog Comparator circuit 5mW laser
Photodiode
Ryan

16. Design Layout
Ryan
Problem: Wires- use of enclosure and problems with soldering

17. Final Product
Ryan

18. Ethical Considerations
Laser trip sensor
Snapshots of both sides of door
Dog bark detection
Devo
-Laser trip sensor is to ensure the dog does not get caught in the door
-Cameras and dog bark detection are to ensure that the nothing is let into or out of the house that shouldn’t be

19. Future Improvements Double sided functionality
Build full prototype to work on a full door
Further refinement of DSP
Use of Wi-Fi shield
Externally Accessible Server
Fully Live Server with Video Feed
Dog in/ Dog out tracking
Devo

20. Summary Full sequence is successful
What we would have done differently
More reliable IR distance sensors
Smaller, lower resolution cameras
Smaller microphone
Noise filter circuit
Miles

21. Special Thanks ECE 445 Staff: Parts shop: Machine Shop: Paul Carney
Lydia Majure
Ryan May
Dennis Yuan
Igor Fedorov
Parts shop:
Mark Smart
Skot Wiedmann
Dan Mast
Wally Smith
Machine Shop:
Scott McDonald
David Switzer
Miles

22. Questions?