1. 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

2. Outline Problem Statement Acknowledgements Operating Environment
Intended Users and Intended Uses
Assumptions and Limitations
End Product and Deliverables
Accomplishments
Approaches considered

3. Outline (cont.) Research Evaluation of Project Success
Recommendations for future work
Lessons Learned
Summary
Questions

4. Acknowledgements
George Ensley
Dr. Ratnesh Kumar
Dr. Nicola Elia

5. Problem Statement
Develop a coin operated device that will convert a residential laundry machine into a commercially used laundry machine.
Mention the differences between commercial and non.

6. Problem Solution
A coin-operated unit that will regulate the power flow with a relay.
A coin-operated unit that will reclaim time.
Time reclaiming is an additional feature proposed by the client.

7. Operating Environment
Temperature between 40º F to 120 º F
Potential for bursting water pipes
High humidity from dryers
Possible power outages

8. Intended Users and Uses
Laundry facility customers
Laundry facility owners/operators
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.

9. 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.
Elaborate on low current
Last bullet – spinning of the drum will draw detectable current

10. 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.
Last bullet – the machine will not automatically start when door is closed.

11. 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.

12. 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).

13. End Product Deliverables
Partially functional coin operated control system
PIC code
Wiring schematics
Prototype budget
Senior design course documents

14. 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.

15. 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.

16. Approaches Considered
Operation Algorithm
Discrete total time
Current detector with total time
Current sensing circuit
Solid state AC voltage circuit
Inductor
Pros and cons

17. Approaches Considered (cont.)
Coin Acceptor
Variable coin receptor
Slotted coin mechanism
Keypad
Smart
Dumb
Controller
PIC
FPGA
Pros and cons

18. Approach Used Current detector with total time Inductor
Slotted coin mechanism
PIC
Keypad

19. 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

20. Design Activities

22. Implementation Activities
Current sensing circuit
Keypad
LCD
Power relay circuit
Interrupts
Owner’s menu
Describe the changes between the initial design activites and the actual implementation activities.

23. Testing Software Testing PIC and LCD PIC and Keypad
PIC and power flow control relay
PIC and coin input mechanism
Menu (state machine)
We made list of tests to complete
After testing and debugging, we repeated tests.
With the menu, we checked for all path coverage.

24. Testing (cont) Hardware Testing
Power supply
Current sensing circuit
Power switching circuit
Keypad interrupt circuit
Entire Unit functionality test (light bulb)

25. Other Activities Current sensing circuit Casing design UL approval
Manual
Nicely mention that we did not complete these;
Mention the idea for the current sensing circuit
Mention that we did not have time to design a case
Mention no UL and no manual.

26. Resources Phase 1 ~ Dec 00-02 All SD documents.
Phase 1 and 2 ~ parts
Client
Advisors

27. Personal Efforts Spring 2004

28. Resource and Financial Requirements
Spring 2004
Document Binding
Poster
Parts
Total
$8.00
$50.00
$30.00
$88.00

29. 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
We tried to stay within budget for commercialization purposes.

30. Financial Requirements with Labor
@ $10/hr
Greg Herr
Craig Zamzow
Latrice Baggett
Hisham Chowdhury
Subtotal
Project Total
$1,600.00
$700.00
$670.00
$790.00
$3,760.00
$3,843.00

31. Schedule
Explain why there are differences

32. Project Evaluation First Semester: Second Semester:
Project Plan (100%)
Poster (100 %)
Design Report (100%)
Second Semester:
Programming PIC (100%)
Integration Testing (95%)
Final Prototype(10%)
Based off of the major milestones, here is our project evaluation.
We bought parts for the final prototype.
LATRICE IS NEXT

33. 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.

34. Recommendations Networking multiple control boxes to a local server.
Proper casing
UL approval
Public TVs and Computers
Users manual
Briefly explain the networking and uses of

35. Lessons Learned . What went well What did not go well Group management
Group communication
Documentation
What did not go well
Time management
Active participation by all members .

36. 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.

37. Lessons Learned (cont.)
What would be done differently
Plan more time for programming and testing.
Start implementation process earlier.

38. Risks and Risk Management
Anticipated potential risks
Loss of a team member.
Exceeding costs.
Management of potential risks
Document everything.
Communication.
Follow project plan.

39. Risk and Risk Management (cont)
Anticipated potential risks encountered
None
Management of anticipated risks
Not needed

40. 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.
Incorrect programming – quickly mention interrupt service routines and interfacing with lcd and keypad

41. Risk and Risk Management (cont)
Resultant changes as a result of unanticipated risks
Program completion
Testing completion
An increase in participation from
the team.

42. 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

43. Questions?