calvin college senior design team 11 aaron maley jeff overweg simeon eisen jacob...
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Calvin College Senior Design Team 11 Aaron Maley Jeff Overweg Simeon Eisen Jacob VanderWall. The Team. Simeon Eisen Jeff Overweg Aaron Maley Jacob VanderWall. A Niche in the Market. - PowerPoint PPT PresentationTRANSCRIPT
Calvin College Senior Design Team 11Aaron Maley Jeff OverwegSimeon Eisen Jacob VanderWall
THE TEAM Simeon Eisen Jeff Overweg Aaron Maley Jacob VanderWall
A NICHE IN THE MARKET There are current pool care systems,
but they are not created and marketed to the average residential pool owner.
Current systems range in price from $1200-$7000 for just the controller alone
A product with the features of the high end systems, at a price that residential pool owners can afford would be a very viable real world product
THE PROJECT To create an affordable chemical control
system for the residential pool market.
What Does it Do? Sample pool water at regular intervals
Microprocessor controlled system Dispense chemicals into the pool pump system
Granule feed system Broadcast pool data via website
Wireless module
MICROCONTROLLER SYSTEM Goal:
Use an embedded microcontroller to control water testing, chemical dispersal, local display, and data being sent to web server.
Major Components and Interfaces: Sensors and Related Circuits Chemical Dispersal Control Local Display/User Interface Analog Data to Web Server
MICROCONTROLLER SYSTEM Full System
Diagram
MICROCONTROLLER SYSTEM Sensors and Related Circuits
Three main sensor inputs Temp, pH, ORP
How are the amounts of Chemicals Needed Calculated? pH, ORP, temperature readings and size of pool
are used to calculate the required dosage Dosage precision can exceed 0.25 oz
FREE CHLORINE CALCULATION
550 600 650 700 750 800 850 9000
1
2
3
4
5
6
7
8
9
10f(x) = 1.4818570105462E-42 x^14.878438602951R² = 0.999134032453171
f(x) = 3.45301367750078E-58 x^20.0989712494528R² = 0.998415565197075f(x) = 3.32883049618107E-69 x^23.734034345008
R² = 0.999538310985709f(x) = 1.11089362419315E-82 x^28.2095631061152R² = 0.998221894253147
f(x) = 2.96330528734171E-103 x^35.0724486795012R² = 0.997884032039689
Free Chlorine as a Function of pH and ORP6.5
Power (6.5)
7
Power (7)
7.5
Power (7.5)
8
Power (8)
8.5
Power (8.5)
ORP (mV)
Free
Chl
orin
e (p
pm)
MICROCONTROLLER SYSTEM Local Display/User Interface
Graphic LCD Touch Screen Interface
What does this allow the user to do? Directly view relevant information Calibrate probes and sensors Define parameters such as:
Pool Volume Pump Cycle Time
MICROCONTROLLER SYSTEM Data to Web Server
Analog Level Created with: PWM signals passed through a low pass filter
How does the Web Server Interpret Values? Varying Duty Cycles Form Different Voltage
Levels Communication Specification for Analog
Interpretation Defines Relationships
MICROCONTROLLER SYSTEM Chemical Dispersal Control
Digital Control Logic (Stepper Motor Control) Solenoid Valve Channel Control
How the System Disperses the Chemicals
INSTRUMENTATION SETUP Sensor Chamber Design
DISPENSER Goal:
To create an interface that would utilize the existing pool pump and filter system to dispense and mix chemicals into the pool water.
Two distinct elements Auger Based Dispenser Diverted Mixing Chamber
MECHANICAL SETUP Final Mechanical Implementation
Pool
FilterPumpSensor ChamberDispenser
MECHANICAL SETUP Dispenser System Design
MECHANICAL SETUP Dispenser Prototype
WORKING COMPONENTS
DISPENSING CALIBRATION
0 5 10 15 20 25 30 35 40 45 500
100
200
300
400
500
600
700
800
900
1000
f(x) = 19.5622497998399 xR² = 0.999998095952494
Dispenser Output Mass vs. Auger Rotation
Mass (g)Linear (Mass (g))
Rotations
Out
put
Mas
s (g
ram
s)
STEPPER MOTOR AND SOLENOID CONTROL
WIRELESS WEB SERVER Goal:
To create a basic web server in order to wirelessly broadcast system readings to the consumer.
Main Components 802.11b Chip/Security Settings Analog Input/Calculations Website Design
WIRELESS WEB SERVER 802.11b Chip/Security Settings
Chip/Development Board Selection Arduino Development Kit Wishield
Security Capabilities Compatible with modern 802.11b/g routers Can utilize 64bit WEP, WPA, WPA2 encryption
WIRELESS WEB SERVER Analog Input Calculations
Varying Duty Cycles + Low Pass Filter Analog Voltage 0V – 5V Communication Specification Determines pH,
ORP, Chemical Status, Temperature
Calculation of Free ChlorinePWM
+0-5 Volts Analog
Low-Pass Filter
WIRELESS WEB SERVER Page Design
WIRELESS WEB SERVER System Block Diagram
COMPETITIVE ANALYSIS Main Competitors:
Chemtrol CAT Aquasol
Competitor’s System
Features Price
Chemtrol 250 pH and ORP Controller $1995.00CAT 4000 pH and ORP Controller + Web
Monitoring$3650.00
Aquasol SPC Controller
pH and ORP Controller $2130.00
Chemtrol PC2000 pH, free Chlorine, Remote interface
$3150.00
SALES & MARKETING Customer Base
Existing( US alone) 5.1 million in-ground pools 3.7 million above-ground pools
Growth( Based on 2007) 131,000 new in-ground pools 233,000 new above-ground pools
Target Demographic Work with BUS 397 Advanced Marketing Class Middle-aged to Elderly in Average Middle to
Upper Middle Class Homes
GOING BEYOND Different ways project could be enhanced or
developed further. Expand Wireless Capability and Complexity Add Online Data Logging Add Wireless System Control Use Precision Designed Mechanical Parts Integrate onto single PCB Develop Business Plan as a Distributer and/or a
Supplier
ACKNOWLEDGEMENTS Tim Theriault– Industrial Consultant Prof. VanderLeest – Team Advisor Brian Honeck, Eric Walstra, Darryl DeBruin – CEAC
Reviewers Bob DeKraker – Parts Ordering Phil Jasperse – Shop Help
QUESTIONS