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

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

Acknowledgements George Ensley Dr. Ratnesh Kumar Dr. Nicola Elia

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.

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.

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 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.

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

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.

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) 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 Partially functional coin operated control system PIC code Wiring schematics Prototype budget Senior design course documents

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 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 Discrete total time Current detector with total time Current sensing circuit Solid state AC voltage circuit Inductor Pros and cons

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

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

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

Design Activities

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.

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.

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

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.

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

Personal Efforts Spring 2004

Resource and Financial Requirements Spring 2004 Document Binding Poster Parts Total $8.00 $50.00 $30.00 $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 We tried to stay within budget for commercialization purposes.

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

Schedule Explain why there are differences

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

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 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

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 .

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

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) Anticipated potential risks encountered None Management of anticipated risks Not needed

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

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 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

Questions?