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Coin Operated Washer/Dryer Phase 2 May 04-05 April 27,2004. Team Members: Latrice Baggett EE Hisham Chowdhury CPRE Greg Herr CPRE Craig Zamzow CPRE. Client: George Ensley Advisors: Nicola Elia Ratnesh Kumar. Outline. Problem Statement Acknowledgements

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coin operated washer dryer phase 2 may 04 05 april 27 2004

Coin Operated Washer/Dryer Phase 2May 04-05April 27,2004

Team Members:

Latrice Baggett EE

Hisham Chowdhury CPRE

Greg Herr CPRE

Craig Zamzow CPRE

Client:

George Ensley

Advisors:

Nicola Elia

Ratnesh Kumar

outline
Outline
  • Problem Statement
  • Acknowledgements
  • Operating Environment
  • Intended Users and Intended Uses
  • Assumptions and Limitations
  • End Product and Deliverables
  • Accomplishments
  • Approaches considered
outline cont
Outline (cont.)
  • Research
  • Evaluation of Project Success
  • Recommendations for future work
  • Lessons Learned
  • Summary
  • Questions
acknowledgements
Acknowledgements
  • George Ensley
  • Dr. Ratnesh Kumar
  • Dr. Nicola Elia
problem statement
Problem Statement
  • Develop a coin operated device that will convert a residential laundry machine into a commercially used laundry machine.
problem solution
Problem Solution
  • A coin-operated unit that will regulate the power flow with a relay.
  • A coin-operated unit that will reclaim time.
operating environment
Operating Environment
  • Temperature between 40º F to 120 º F
  • Potential for bursting water pipes
  • High humidity from dryers
  • Possible power outages
intended users and uses
Intended Users and Uses

Uses

  • 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.

Users

  • Laundry facility customers
  • Laundry facility owners/operators
assumptions
Assumptions
  • Low current with door open.
  • Little or no current when machine is off.
  • Gas Dryers will draw a detectable current while operating.
  • Heating elements in electric dryers will switch off and on.
assumptions cont
Assumptions (cont)
  • The owner will not enter the configuration menu while the control box is controlling the machine.
  • Quarters as the coin payment.
  • Dryer will have a start button or knob, no auto restart.
limitations
Limitations
  • Prototype must cost less than $150.
  • The machines require 220V or 110V.
  • Wire connections between the machine and box are limited to the power cord.
  • One laundry machine per box.
limitations cont
Limitations (cont)
  • The cycle timer and window timer is limited from 0 to 99 minutes, mm:ss display.
  • The cycle count and box count are limited to 256 (8 bit unsigned char).
end product deliverables
End Product Deliverables
  • Partially functional coin operated control system
  • PIC code
  • Wiring schematics
  • Prototype budget
  • Senior design course documents
previous accomplishments
Previous Accomplishments
  • Phase 1 (Dec 00-02)
      • Purchased parts (PIC, power supply, case)
      • Designed current sensing circuit.
      • Designed the power flow relay circuit.
  • Phase 2 (Dec 01-10)
      • Researched a different coin mechanism
      • Started PIC programming, but not completed.
present accomplishments
Present Accomplishments
  • 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
Approaches Considered

Operation Algorithm

  • Discrete total time
  • Current detector with total time

Current sensing circuit

  • Solid state AC voltage circuit
  • Inductor
approaches considered cont
Coin Acceptor

Variable coin receptor

Slotted coin mechanism

Keypad

Smart

Dumb

Controller

PIC

FPGA

Approaches Considered (cont.)
approach used
Approach Used
  • Current detector with total time
  • Inductor
  • Slotted coin mechanism
  • PIC
  • Keypad
research
Research
  • 1st semester research – washers/dryers and selecting the micro-controller.
  • 2nd semester research- Dataman and Hi-Tech compilers/simulators.
    • Hi-Tech ~ compiles C code into hex or assembly.
    • Programmer (Dataman 48)~ downloads the hex file into the PIC microcontroller
implementation activities
Implementation Activities
  • Current sensing circuit
  • Keypad
  • LCD
  • Power relay circuit
  • Interrupts
  • Owner’s menu
testing
Testing

Software Testing

  • PIC and LCD
  • PIC and Keypad
  • PIC and power flow control relay
  • PIC and coin input mechanism
  • Menu (state machine)
testing cont
Testing (cont)

Hardware Testing

  • Power supply
  • Current sensing circuit
  • Power switching circuit
  • Keypad interrupt circuit

Entire Unit functionality test (light bulb)

other activities
Other Activities
  • Current sensing circuit
  • Casing design
  • UL approval
  • Manual
resources
Resources
  • Phase 1 ~ Dec 00-02 All SD documents.
  • Phase 2 ~ Dec 01-10 All SD documents.
  • Phase 1 and 2 ~ parts
  • Client
  • Advisors
resource and financial requirements
Resource and Financial Requirements

Spring 2004

Document Binding

Poster

Parts

Total

$8.00

$50.00

$30.00

$88.00

slide29

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

Subtotal

Project Total

Financial Requirements with Labor

$1,600.00

$700.00

$670.00

$790.00

$3,760.00

$3,843.00

project evaluation
Project Evaluation

First Semester:

  • Project Plan (100%)
  • Poster (100 %)
  • Design Report (100%)

Second Semester:

  • Programming PIC (100%)
  • Integration Testing (95%)
  • Final Prototype(10%)
commercialization
Commercialization
  • Keystone pricing, markup the cost. Ex. Cost = $75, final price = $150.
  • At $150-$200 our product has high utility/cost and a high rate of return for owners.
  • Potential market includes all Laundromat owners in the process of remodeling.
recommendations
Recommendations
  • Networking multiple control boxes to a local server.
  • Proper casing
  • UL approval
  • Public TVs and Computers
  • Users manual
lessons learned
Lessons Learned

What went well

  • Group management
  • Group communication
  • Documentation

What did not go well

  • Time management
  • Active participation by all members

.

lessons learned cont
Lessons Learned (cont.)

Technical knowledge gained

  • PIC programming
  • Interfacing different input/output

devices with PIC.

Non-Technical knowledge gained

  • Commercial vs. residential machines.
  • Determining the market niche of our product.
lessons learned cont37
Lessons Learned (cont.)

What would be done differently

  • Plan more time for programming and testing.
  • Start implementation process earlier.
risks and risk management
Risks and Risk Management

Anticipated potential risks

  • Loss of a team member.
  • Exceeding costs.

Management of potential risks

  • Document everything.
  • Communication.
  • Follow project plan.
risk and risk management cont
Risk and Risk Management (cont)

Anticipated potential risks encountered

  • None

Management of anticipated risks

  • Not needed
risk and risk management cont40
Risk and Risk Management (cont)

Unanticipated risks encountered

  • Incorrectly programming the micro- controller.
  • Time for testing.
  • Lack of team member(s) participating.

Management of unanticipated risks

  • Spend extra hours in the lab.
  • Defined consequences of not

participating.

risk and risk management cont41
Risk and Risk Management (cont)

Resultant changes as a result of unanticipated risks

  • Program completion
  • Testing completion
  • An increase in participation from

the team.

summary
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