Transcript Presentation

USING A RASPBERRY PI AS A
WATER DETECTION SYSTEM
JO S H UA C . D U N N
N E TWORK S ECUR ITY & E LEC TRONICS PRO GR A M ,
EA STE RN K E N TU C KY U N I V ERSI TY
JO S H UA _D U NN35@MYMA IL .EKU.EDU
Better known as:
FloodPi
Outline
• Big Picture: Home owners and renters don’t enjoy having their
property damaged
Water is one of the leading causes of home damage
• Average cost of repair is $2200 (HomeAdvisor)
•
• Key Functions
Alerting user to water
• Providing data for establishment of trends
• Water damage prevention
• Insurance write off
•
Outline (Cont’d)
• Basic Detection Circuit Layout
Motivation
• This area in my residence hall
floods frequently
• Why?
•
To protect mine and University
Housing’s Property
• Who?
•
Me and Eastern Kentucky University
Housing
• Where and When?
•
Sullivan Hall, whenever it rains or
water accumulates on the floor
Introduction:
Technical Background
• Networking
•
Raspberry Pi uses the network to
deliver alerts to the user console
• Computer Science
•
•
Raspberry Pi needs a special
program to detect water
Assembly of Raspberry Pi
• Electronic Engineering
•
Assembly of detection circuit,
shown right
Basic Detection Circuit
• How it works
•
•
Voltage flows from 3.3 Volts (Pin 1, yellow square)
Then flows to bread board
•
•
•
•
Normal, no water branch has a 10,000 Ohm resistor
Water detection branch of the circuit has a 1,000 Ohm resistor
If there’s water, then the electricity will take the path of
least resistance and flow through the water, and out to
GPIO Pin 22 (Green, 8th from top on left)
If there is no water, then the power goes through
Ground pin (Black, 3rd from top on right)
Problem Statement
• Main Problem
•
Detect and alert user if water is detected in the alert area
• Secondary Problems
•
•
Ensuring detection circuit is functional
Ensuring the system has a power & Ethernet connection
Problems (Cont’d).
• Constraints & Limitations
•
•
Limited to being near a plug for both Ethernet and power
Limited to areas with internet connection
Assumptions
• That there’s water that poses a risk to property
• That the circuit will not spontaneously fail
• That the web interface for the software won’t fail
Proposed Solution
Block Diagram of method
Proposed Solution,
Steps to Solve the Problem
• Figure out best method for detecting water
• Figure out how to best report findings to user(s)
• Mission Critical Functionality
•
Ability to detect water
• Mission Assistive Functionality
•
Ability to report to user
Results
• What I learned:
Phase 1: Research & Part Searching
• Phase 2: Building and Testing
• Phase 3: Proof of Concept
•
Phase 1: Research & Part Searching
• Learning how to set objectives for this kind of projects
• Having a budget
• Ensuring all parts are compatible with all other componets
Phase 2: Building and Testing
• How to build a circuit safely
• Bug testing a circuit
• Figuring out the best resistive values
Phase 3: Proof of Concept
• How to make all components mesh together
• How to design a report and share it with my peers
Conclusions
• Sensor successfully alarmed in presence of water and non-alarm
when water was not present
•
Means Pi could be deployed in the home
•
•
Not recommended to be sole point of detection
Good proof of concept, but potential risks outweigh some of the benefits
• Learned how to manage software on a remote computer
•
•
GPIO setup was handled by the website for the Pi
Also, rules for alarms were set on the website too.
Conclusions (Cont’d)
• Good proof-of-concept project
•
However, if you want 100% dependable protection, then an
alarm company is the way to go
• Good project for learning how to work with Raspberry
Pi/Linux
•
Had to install the water detection software via Command
Line
Future Improvements
• Add text messaging/phone call capabilities
•
Users will check phone more often than a website
• Add Battery for remote deployment
•
Allows home user to not need a source of voltage
near the potential leak
• Add case to shield components from
splashing
•
Also, add aesthetic value
• Use the Raspberry Pi 3 instead of the
Raspberry Pi 2 Model B
•
Pi 3 has built-in Wi-Fi capabilities
Questions?
Credits
• Water Damage repair cost, http://www.homeadvisor.com/cost/disasterrecovery/repair-water-damage/
• Simplified Detection Circuit, Own work
• Picture of Sullivan Hall Basement, Own Work
• Detection Circuit, Own Work
• Raspberry Pi GPIO Pin layout, http://www.elecrow.com/gpio-extensionboard-for-raspberry-pi-p-717.html
• Lithium Ion Battery
https://upload.wikimedia.org/wikipedia/commons/1/1a/Li_ion_laptop_
battery.jpg
• ADT Logo, http://www.techdigest.tv/2011/12/how_to_pick_the.html
Credits (Cont’d)
• My Paychecks
• Professors Vigs, Kilgore and Richardson
• My peers in the Networking & Computer Science Departments
•
Quise, Drake, Justin, Lucas, Eric
• Matt Phelps
• CanaKit for the GPIO Breakout Kit
• Raspberry Pi Foundation