p oseidon p ool c are calvin college senior design team 11 aaron maley jeff overweg simeon eisen...
TRANSCRIPT
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POSEIDON POOL CARECalvin College Senior Design Team 11
Aaron Maley Jeff Overweg
Simeon Eisen Jacob VanderWall
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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
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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
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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
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MICROCONTROLLER SYSTEM
Full System Diagram
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MICROCONTROLLER SYSTEM
Sensors and Related Circuits Four main sensor inputs
Temp, pH, ORP, Chemical Level
How are the amounts of Chemicals Needed Calculated? Tested regularly (user defined) and dispersed down
to 0.7 oz precision Based on Free Chlorine Calculation and pH readings
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FREE CHLORINE CALCULATION
550 600 650 700 750 800 850 9000
1
2
3
4
5
6
7
8
9
10
f(x) = 1.4818570105462E-42 x^14.878438602951R² = 0.999134032453171
f(x) = 3.45301367750068E-58 x^20.0989712494529R² = 0.998415565197075
f(x) = 3.32883049618097E-69 x^23.734034345008R² = 0.999538310985709f(x) = 1.11089362419312E-82 x^28.2095631061152
R² = 0.998221894253147f(x) = 2.96330528734154E-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)
Fre
e C
hlo
rine (
ppm
)
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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 pH/ Free Chlorine Thresholds Chlorine “Shock” frequency
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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
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MICROCONTROLLER SYSTEM
Chemical Dispersal Control Digital Control Logic (Stepper Motor Control) Solenoid Valve Channel Control
How the System Disperses the Chemicals
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INSTRUMENTATION SETUP
Sensor Chamber Design
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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
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MECHANICAL SETUP
Final Mechanical Implementation
Pool
FilterPumpMixing Chamber
Dispenser
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MECHANICAL SETUP Dispenser System Design
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MECHANICAL SETUP
Actual Dispenser
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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
Outp
ut
Mass (
gra
ms)
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STEPPER MOTOR AND SOLENOID CONTROL
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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
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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
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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 Chlorine
PWM
+ 0-5 Volts Analog=
Low-Pass Filter
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WIRELESS WEB SERVER
Website Design Theoretical Design
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WIRELESS WEB SERVER
Actual Page Design
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WIRELESS WEB SERVER
System Block Diagram
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BUDGET
Total Project Budget Originally given $300 for budget Granted additional money at start of 2nd
Semester
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COMPETITIVE ANALYSIS
Main Competitors: Chemtrol CAT Aquasol
Competitor’s System
Features Price
Chemtrol 250 pH and ORP Controller $1995.00
CAT 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
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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
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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
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QUESTIONS