SPA COMMANDER Dan Latuszek Ken Chou Matt Bergsma Michelle Ochitwa Sulien Wong

SPA COMMANDERDan Latuszek

Ken ChouMatt Bergsma

Michelle OchitwaSulien Wong

Team Introduction• 5 dedicated engineering students focused on improving people’s lives

– Dan Latuszek – Chief Executive Officer• Systems Engineering

– Sulien Wong – Chief Financial Officer• Systems Engineering

– Matt Bergsma, DipT – Chief Technical Officer• Systems Engineering

– Michelle Ochitwa – Vice President Operations/acting secretary• Systems Engineering

– Ken Chou – Chief Marketing Officer• Biomedical Engineering

• Wouldn’t mind getting rich

Team IntroOverviewGoalsMarket and DesignMarket StatsNeedsBudgetTimeTechnical OverviewMechanicalSensorsControlElectricalInterfacePost-DesignCost of Prod.MarketabilityFinal ThoughtsFuture Consid.ThanksFinal Thoughts

Engineering Roles• Market analysis

– Ken Chou, Dan Latuszek, Michelle Ochitwa, Sulien Wong• Software control and electrical design

– Ken Chou, Dan Latuszek, Sulien Wong• Mechanical and fluid system design

– Matt Bergsma, Michelle Ochitwa• Chassis

– Ken Chou, Matt Bergsma


Presentation Overview

• Goal• Market analysis and consumer needs• Budget and time management• Mechanical and sensors• Electrical and control• Cost of production, marketability, and viability• Future considerations• Acknowledgements• Final thoughts


Project Goals

• Design a chemical test and delivery system for spas and pools

• Create a portable solution• Fabricate a working prototype• Capture an unused market niche• Get rich


MARKET AND DESIGN CONSIDERATIONS

Market Analysis• In North America alone:

– Over 6 million existing private spas/hot tubs• Annual sales exceed 300,000 units

– Over 8 million existing private pools• Annual sales exceed 300,000 units

– Majority of both markets require manual chemical calibration• Currently available products:

– Expensive inline systems costing well over $1000


Consumer Needs

• Easy to use and automatic• Not overly expensive• Durable• Aesthetically pleasing


Budget

• Upper limit of $500 CAD• No lower limit (Yay, profits!)• Find a golden mean between low cost and high

reliability


Time Management

• In 3 months– Complete documentation– Complete hardware and software design

• Piping, motors, PIC programming– Test and debug

• Analyze operation and proof of concept


Time Management Team IntroOverviewGoalsMarket and DesignMarket StatsNeedsBudgetTimeTechnical OverviewMechanicalSensorsControlElectricalInterfacePost-DesignCost of Prod.MarketabilityFinal ThoughtsFuture Consid.ThanksFinal Thoughts

MECHANICAL AND SENSORS

Safety Requirements• Importance of chemical levels:

– High chlorine concentration causes• Skin irritation, eye irritation, respiratory problems

– Low of a chlorine concentration• Infections, bacterial growth

– pH needs to be maintained at 7.5, that of a human eye• The Spa Commander maintains chemical levels at:

– Between 1 ppm and 3 ppm for chlorine– Between 7.4 and 7.6 for pH


Mechanical

• 3 servo motors control the gates of the chemical containers

• Submersible pump to move the pool water• PVC piping for light weight, low cost control of water

flow• 300 mL chemical containers

– Approximately one month’s worth of chemical for a spa


Mechanical Team IntroOverviewGoalsMarket and DesignMarket StatsNeedsBudgetTimeTechnical OverviewMechanicalSensorsControlElectricalInterfacePost-DesignCost of Prod.MarketabilityFinal ThoughtsFuture Consid.ThanksFinal Thoughts

Servo Motor Specifications• Model: HS-82MG• 0 degrees

– Square wave, 20 ms period @ 5% duty cycle• 90 degrees

– Square wave, 20 ms period @ 10% duty cycle


Sensors

• Current implementation – current based electrolytic sensors– Operates under similar principles as ORP sensors


CONTROL, ELECTRICAL, AND INTERFACE

Control

• Microchip PIC16F690 microcontroller– Servo motor pulse width modulation– Controls LED interface


Chlorine Flowchart Team IntroOverviewGoalsMarket and DesignMarket StatsNeedsBudgetTimeTechnical OverviewMechanicalSensorsControlElectricalInterfacePost-DesignCost of Prod.MarketabilityFinal ThoughtsFuture Consid.ThanksFinal Thoughts

pH Flowchart Team IntroOverviewGoalsMarket and DesignMarket StatsNeedsBudgetTimeTechnical OverviewMechanicalSensorsControlElectricalInterfacePost-DesignCost of Prod.MarketabilityFinal ThoughtsFuture Consid.ThanksFinal Thoughts

Electrical

• Converted 100W AT power supply– Rails:

• 5V (red)• +/- 12V (yellow, blue)• 3.3V (orange)• 5V standby (purple)

• Filter, op-amp, sensor


Interface

• 7 LEDs– Rationale: simplicity

• No user input

Power Pool Safe

pH- Low

pH+ Low

Cl/BrLow

Tank Level

pHUnbalanced

SanitizerUnbalanced


POST-DESIGN THOUGHTS

Actual Cost of Production• Assuming we are able to attain bulk prices

– Motors: $60– pH and Cl sensors: $100 (different from current

implementation)– Casing: $20-30– Piping/containers: $10– Microcontroller: $2– Pump: $20-30– Power supply: $30– Other electronic components: <$10– Total: $250-270 + Labour


Marketability

• Very marketable product– Greatly reduces the burden of spa owners

• Relatively inexpensive, depends on how much consumers are willing to pay


FINAL THOUGHTS

Future Considerations

• Improve chassis aesthetics and shrink dimensions– Very integral to consumer decisions

• Improve interface aesthetics– Maybe a small LCD display

• Improve Sensor Performance– Use higher quality ORP sensors

• Much more accurate• Much more expensive

• Implement shocking feature• More waterproofing and failsafe


Acknowledgements

• Dr. Andrew Rawicz, Steve Whitmore• Duncan Chan, Ali Ostafar, Sara Mogahddamjoo• Dan Bergsma• Masih Hosseini• Friends and Family


Final Thoughts

• Completed proof of concept design• Gained valuable experience

– Documentation, team dynamics, interdisciplinary process


Questions?

Documents

SPA COMMANDER Dan Latuszek Ken Chou Matt Bergsma Michelle Ochitwa Sulien Wong