SPA COMMANDER Dan Latuszek Ken Chou Matt Bergsma Michelle Ochitwa Sulien 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 Intro Overview Goals Market and Design Market Stats Needs Budget Time Technical Overview Mechanical Sensors Control Electrical Interface Post-Design Cost of Prod. Marketability Final Thoughts Future Consid. Thanks Final 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 Team Intro Overview Goals Market and Design Market Stats Needs Budget Time Technical Overview Mechanical Sensors Control Electrical Interface Post-Design Cost of Prod. Marketability Final Thoughts Future Consid. Thanks Final Thoughts

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 Team Intro Overview Goals Market and Design Market Stats Needs Budget Time Technical Overview Mechanical Sensors Control Electrical Interface Post-Design Cost of Prod. Marketability Final Thoughts Future Consid. Thanks 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 Team Intro Overview Goals Market and Design Market Stats Needs Budget Time Technical Overview Mechanical Sensors Control Electrical Interface Post-Design Cost of Prod. Marketability Final Thoughts Future Consid. Thanks Final Thoughts

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 Team Intro Overview Goals Market and Design Market Stats Needs Budget Time Technical Overview Mechanical Sensors Control Electrical Interface Post-Design Cost of Prod. Marketability Final Thoughts Future Consid. Thanks Final Thoughts

Consumer Needs Easy to use and automatic Not overly expensive Durable Aesthetically pleasing Team Intro Overview Goals Market and Design Market Stats Needs Budget Time Technical Overview Mechanical Sensors Control Electrical Interface Post-Design Cost of Prod. Marketability Final Thoughts Future Consid. Thanks Final Thoughts

Budget Upper limit of $500 CAD No lower limit (Yay, profits!) Find a golden mean between low cost and high reliability Team Intro Overview Goals Market and Design Market Stats Needs Budget Time Technical Overview Mechanical Sensors Control Electrical Interface Post-Design Cost of Prod. Marketability Final Thoughts Future Consid. Thanks Final Thoughts

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 Team Intro Overview Goals Market and Design Market Stats Needs Budget Time Technical Overview Mechanical Sensors Control Electrical Interface Post-Design Cost of Prod. Marketability Final Thoughts Future Consid. Thanks Final Thoughts

Time Management Team Intro Overview Goals Market and Design Market Stats Needs Budget Time Technical Overview Mechanical Sensors Control Electrical Interface Post-Design Cost of Prod. Marketability Final Thoughts Future Consid. Thanks Final 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 Team Intro Overview Goals Market and Design Market Stats Needs Budget Time Technical Overview Mechanical Sensors Control Electrical Interface Post-Design Cost of Prod. Marketability Final Thoughts Future Consid. Thanks Final Thoughts

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 Team Intro Overview Goals Market and Design Market Stats Needs Budget Time Technical Overview Mechanical Sensors Control Electrical Interface Post-Design Cost of Prod. Marketability Final Thoughts Future Consid. Thanks Final Thoughts

Mechanical Team Intro Overview Goals Market and Design Market Stats Needs Budget Time Technical Overview Mechanical Sensors Control Electrical Interface Post-Design Cost of Prod. Marketability Final Thoughts Future Consid. Thanks Final Thoughts

Servo Motor Specifications Model: HS-82MG 0 degrees – Square wave, 20 ms 5% duty cycle 90 degrees – Square wave, 20 ms 10% duty cycle Team Intro Overview Goals Market and Design Market Stats Needs Budget Time Technical Overview Mechanical Sensors Control Electrical Interface Post-Design Cost of Prod. Marketability Final Thoughts Future Consid. Thanks Final Thoughts

Sensors Current implementation – current based electrolytic sensors – Operates under similar principles as ORP sensors Team Intro Overview Goals Market and Design Market Stats Needs Budget Time Technical Overview Mechanical Sensors Control Electrical Interface Post-Design Cost of Prod. Marketability Final Thoughts Future Consid. Thanks Final Thoughts

CONTROL, ELECTRICAL, AND INTERFACE

Control Microchip PIC16F690 microcontroller – Servo motor pulse width modulation – Controls LED interface Team Intro Overview Goals Market and Design Market Stats Needs Budget Time Technical Overview Mechanical Sensors Control Electrical Interface Post-Design Cost of Prod. Marketability Final Thoughts Future Consid. Thanks Final Thoughts

Chlorine Flowchart Team Intro Overview Goals Market and Design Market Stats Needs Budget Time Technical Overview Mechanical Sensors Control Electrical Interface Post-Design Cost of Prod. Marketability Final Thoughts Future Consid. Thanks Final Thoughts

pH Flowchart Team Intro Overview Goals Market and Design Market Stats Needs Budget Time Technical Overview Mechanical Sensors Control Electrical Interface Post-Design Cost of Prod. Marketability Final Thoughts Future Consid. Thanks Final Thoughts

Electrical Converted 100W AT power supply – Rails: 5V (red) +/- 12V (yellow, blue) 3.3V (orange) 5V standby (purple) Filter, op-amp, sensor Team Intro Overview Goals Market and Design Market Stats Needs Budget Time Technical Overview Mechanical Sensors Control Electrical Interface Post-Design Cost of Prod. Marketability Final Thoughts Future Consid. Thanks Final Thoughts

Interface 7 LEDs – Rationale: simplicity No user input Team Intro Overview Goals Market and Design Market Stats Needs Budget Time Technical Overview Mechanical Sensors Control Electrical Interface Post-Design Cost of Prod. Marketability Final Thoughts Future Consid. Thanks Final Thoughts

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: $ Labour Team Intro Overview Goals Market and Design Market Stats Needs Budget Time Technical Overview Mechanical Sensors Control Electrical Interface Post-Design Cost of Prod. Marketability Final Thoughts Future Consid. Thanks Final Thoughts

Marketability Very marketable product – Greatly reduces the burden of spa owners Relatively inexpensive, depends on how much consumers are willing to pay Team Intro Overview Goals Market and Design Market Stats Needs Budget Time Technical Overview Mechanical Sensors Control Electrical Interface Post-Design Cost of Prod. Marketability Final Thoughts Future Consid. Thanks Final Thoughts

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 Team Intro Overview Goals Market and Design Market Stats Needs Budget Time Technical Overview Mechanical Sensors Control Electrical Interface Post-Design Cost of Prod. Marketability Final Thoughts Future Consid. Thanks Final Thoughts

Acknowledgements Dr. Andrew Rawicz, Steve Whitmore Duncan Chan, Ali Ostafar, Sara Mogahddamjoo Dan Bergsma Masih Hosseini Friends and Family Team Intro Overview Goals Market and Design Market Stats Needs Budget Time Technical Overview Mechanical Sensors Control Electrical Interface Post-Design Cost of Prod. Marketability Final Thoughts Future Consid. Thanks Final Thoughts

Completed proof of concept design Gained valuable experience – Documentation, team dynamics, interdisciplinary process Team Intro Overview Goals Market and Design Market Stats Needs Budget Time Technical Overview Mechanical Sensors Control Electrical Interface Post-Design Cost of Prod. Marketability Final Thoughts Future Consid. Thanks Final Thoughts

Questions?