Transcript Calvin College Senior Design Team 11 Aaron Maley Jeff Overweg Simeon Eisen Jacob VanderWall.

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



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


Dispense chemicals into the pool pump system


Microprocessor controlled 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
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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
Free Chlorine as a Function of pH and ORP
10
6.5
7
9
7.5
8
Free Chlorine (ppm)
8
7
8.5
6
Степенн
ая (6.5)
5
4
Степенн y = 1E-42x14,878
ая (7)
R² = 0,9991
3
Степенн y = 3E-58x20,099
ая (7.5)
R² = 0,9984
2
1
Степенн y = 3E-69x23,734
ая (8)
R² = 0,9995
0
Степенн
ая (8.5)
550
600
650
700
750
ORP (mV)
800
850
900
y = 1E-82x28,21
R² = 0,9982
y = 3E-103x35,072
R² = 0,9979
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
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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
Dispenser
Sensor
Chamber
Pump
Filter
MECHANICAL SETUP

Dispenser System Design
MECHANICAL SETUP

Dispenser Prototype
WORKING COMPONENTS
DISPENSING CALIBRATION
Dispenser Output Mass vs. Auger Rotation
1000
900
y = 19,562250x
R² = 0,999996
Output Mass (grams)
800
700
600
500
Mass (g)
400
Линейная (Mass (g))
300
200
100
0
0
10
20
30
Rotations
40
50
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
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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
Low-Pass Filter
+
0-5 Volts Analog
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
$1995.00
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
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
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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.



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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