Transcript Coin Operated Washer/Dryer Phase 2 May 04-05

Coin Operated Washer/Dryer
Phase 2
May 04-05
April 27,2004
Client:
George Ensley
Advisors:
Nicola Elia
Ratnesh Kumar
Team Members:
Latrice Baggett EE
Hisham Chowdhury CPRE
Greg Herr CPRE
Craig Zamzow CPRE
Outline
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Problem Statement
Acknowledgements
Operating Environment
Intended Users and Intended Uses
Assumptions and Limitations
End Product and Deliverables
Accomplishments
Approaches considered
Outline (cont.)
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Research
Evaluation of Project Success
Recommendations for future work
Lessons Learned
Summary
Questions
Acknowledgements
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George Ensley
Dr. Ratnesh Kumar
Dr. Nicola Elia
Problem Statement
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Develop a coin operated device that will convert
a residential laundry machine into a
commercially used laundry machine.
Problem Solution
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A coin-operated unit that will regulate the power
flow with a relay.
A coin-operated unit that will reclaim time.
Operating Environment
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Temperature between 40º F to 120 º F
Potential for bursting water pipes
High humidity from dryers
Possible power outages
Intended Users and Uses
Users
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Laundry facility
customers
Uses
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Laundry facility
owners/operators
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Laundry facilities with
multiple machines.
Monitor a machine’s usage:
machine cycle count and
control box cycle count.
Strategically move machines
according to their usage,
which will in turn allow for
more uniform wear on all of
the machines.
Assumptions
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Low current with door open.
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Little or no current when machine is off.
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Gas Dryers will draw a detectable current
while operating.
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Heating elements in electric dryers will
switch off and on.
Assumptions (cont)
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The owner will not enter the
configuration menu while the control
box is controlling the machine.
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Quarters as the coin payment.
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Dryer will have a start button or knob,
no auto restart.
Limitations
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Prototype must cost less than $150.
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The machines require 220V or 110V.
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Wire connections between the machine and
box are limited to the power cord.
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One laundry machine per box.
Limitations (cont)
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The cycle timer and window timer is limited
from 0 to 99 minutes, mm:ss display.
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The cycle count and box count are limited to
256 (8 bit unsigned char).
End Product Deliverables
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Partially functional coin operated control
system
PIC code
Wiring schematics
Prototype budget
Senior design course documents
Previous Accomplishments
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Phase 1 (Dec 00-02)
Purchased parts (PIC, power supply, case)
 Designed current sensing circuit.
 Designed the power flow relay circuit.
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Phase 2 (Dec 01-10)
Researched a different coin mechanism
 Started PIC programming, but not completed.
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Present Accomplishments
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Define algorithm.
Selected micro-controller.
Lab
 LCD functionality.
 Tested the current sensing circuit.
 Keypad Input functionality.
 Power flow throughout box.
 Menu implemented.
 Power switching circuit.
 Integration testing.
Approaches Considered
Operation Algorithm
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Discrete total time
Current detector with total time
Current sensing circuit
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Solid state AC voltage circuit
Inductor
Approaches Considered
(cont.)
Coin Acceptor
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Variable coin receptor
Slotted coin mechanism
Keypad
 Smart
 Dumb
Controller
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PIC
FPGA
Approach Used
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Current detector with total time
Inductor
Slotted coin mechanism
PIC
Keypad
Research
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1st semester research – washers/dryers and
selecting the micro-controller.
2nd semester research- Dataman and HiTech compilers/simulators.
– Hi-Tech ~ compiles C code into hex or
assembly.
– Programmer (Dataman 48)~ downloads
the hex file into the PIC microcontroller
Design Activities
Implementation Activities
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Current sensing circuit
Keypad
LCD
Power relay circuit
Interrupts
Owner’s menu
Testing
Software Testing
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PIC and LCD
PIC and Keypad
PIC and power flow control relay
PIC and coin input mechanism
Menu (state machine)
Testing (cont)
Hardware Testing
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Power supply
Current sensing circuit
Power switching circuit
Keypad interrupt circuit
Entire Unit functionality test (light bulb)
Other Activities
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Current sensing circuit
Casing design
UL approval
Manual
Resources
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Phase 1 ~ Dec 00-02 All SD documents.
Phase 2 ~ Dec 01-10 All SD documents.
Phase 1 and 2 ~ parts
Client
Advisors
Personal Efforts
Spring 2004
140
120
100
Greg
Hisham
Latrice
Craig
80
60
40
20
0
ta
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D
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ntat
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m
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Im p
ing
Test
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P re
Misc
Resource and Financial
Requirements
Spring 2004
Document Binding
Poster
Parts
$8.00
$50.00
$30.00
Total
$88.00
Resource and Financial
Requirements
Total project
PIC
LCD
Keypad
Casing materials
Wiring materials
Coin Mechanism
Power supply
Total
$7
$10
$5
$15
$8
$25
$13
$83.00
Financial Requirements
with Labor
@ $10/hr
 Greg Herr
 Craig Zamzow
 Latrice Baggett
 Hisham Chowdhury
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Subtotal
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Project Total
$1,600.00
$700.00
$670.00
$790.00
$3,760.00
$3,843.00
Schedule
Project Evaluation
First Semester:
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Project Plan (100%)
Poster (100 %)
Design Report (100%)
Second Semester:
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Programming PIC (100%)
Integration Testing (95%)
Final Prototype(10%)
Commercialization
Keystone pricing, markup the cost. Ex. Cost
= $75, final price = $150.
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At $150-$200 our product has high
utility/cost and a high rate of return for owners.
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Potential market includes all Laundromat
owners in the process of remodeling.
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Recommendations
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Networking multiple control boxes to a local
server.
Proper casing
UL approval
Public TVs and Computers
Users manual
Lessons Learned
What went well
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Group management
Group communication
Documentation
What did not go well
 Time
management
 Active participation by all members
Lessons Learned (cont.)
Technical knowledge gained
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PIC programming
Interfacing different input/output
devices with PIC.
Non-Technical knowledge gained
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Commercial vs. residential machines.
 Determining the market niche of our
product.
Lessons Learned (cont.)
What would be done differently
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Plan more time for programming and
testing.
Start implementation process earlier.
Risks and Risk
Management
Anticipated potential risks
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Loss of a team member.
Exceeding costs.
Management of potential risks
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Document everything.
Communication.
Follow project plan.
Risk and Risk Management
(cont)
Anticipated potential risks encountered
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None
Management of anticipated risks
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Not needed
Risk and Risk Management
(cont)
Unanticipated risks encountered
Incorrectly programming the microcontroller.
 Time for testing.
 Lack of team member(s) participating.
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Management of unanticipated risks
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Spend extra hours in the lab.
Defined consequences of not
participating.
Risk and Risk Management
(cont)
Resultant changes as a result of
unanticipated risks
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Program completion
Testing completion
An increase in participation from
the team.
Summary
Separate coin mechanism to allow
the use of non-commercial
washer/dryers in a laundromat
business.
 Integrating a microcontroller with
solid-state electrical components to
control the flow of electricity to the
washer/dryers.
 Economical
 User friendly
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Questions?