cs-ee 481 1founder’s day university of portland school of engineering team steel bridge digital...

CS-EE 481

1Founder’s DayUniversity of Portland School of Engineering

Team STEEL BridgeDigital Thermostat

AuthorsShawn Patterson

Chris Wong

Kyle Woodard

AdvisorDr. Robert Albright

Dr. Peter Osterberg

Industry RepresentativeMr. Hui

Affiliation

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Agenda

• Introduction Kyle Woodard

• Background Kyle Woodard

• Methods Chris Wong

• Results All

• Conclusions Shawn Patterson

• Demonstration Shawn Patterson

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Introduction

• Welcome!

• Have you ever wondered the temperature of your refrigerator based upon a generic turn dial?

• Reduce the chances of spoiling foods and delivering fresh cold beverages!

• Benefits:– Digital thermostat and the basic components of creating one

– Skills developed from completing Senior Design project

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Background

Provides the ability to store food produce and beverages at optimal temperatures:Generic setting vs. specific degrees

Clear display of current temperature

Smaller range

MOSIS Analog measurements, digital data, MOSIS calculation,

output control of external segments

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Methods

Describes how you did what you did.

What technical and logical sequence did you follow?

Be sure your procedure follows standard engineering practices.

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Results

Start by describing the architecture of your project.

Then, move to your implementation.

Start with a high-level block diagram, describe it’s major blocks, and then drop into each block and do the same.

Describe any data collected and compare it to your theoretical calculations.

You will likely need several Results slides

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7

Temperature Input

• Temperature read from fridge using a thermocouple probe

• Displayed on LEDs and used by MOSIS to control the compressor

Founder’s DayUniversity of Portland School of Engineering

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LEDs

• Limited to number of I/O pins of MOSIS.

• To drive LEDs, used driver chips to convert binary coded decimal into 7 output pins that drive LEDs


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Thermocouple Probe

• K-type probe (most linear around 0°)

• 2 dissimilar metals, joined at one end. Heating this junction creates voltage and internal logic converts voltage to degrees

• Grounded (-) terminal so any change in output voltage is positive

• 0.1 ° mV per 0.1 ° degree change


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A/D Converter

• Translates voltage into digital data used by MOSIS

• 0.3 mV per change in bit state

• Each bit state corresponds to 0.1 °


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OpAmp

• In order to match 0.3mV/bit change with the 0.1 mV output of probe, need to amplify probe’s output

• OpAmp placed in confiruration to give a gain of +3


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User Input

• User reads actual temperature and sets desired temperature

• User sets desired temperature with push-buttons


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Debouncing Circuit

• Used a debouncing circuit for ringing in push-buttons

• Tried RS latch, RC circuit, and settled on Schmitt Trigger


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Results: Clock

• Utilized a 555 timing IC as main clock.

• F = 1/[.693C(Ra+2Rb)]

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University of Portland School of Engineering

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Clock (Cont.)

• Used clock as sampling input to ADC.

• Sampling input needed a high duty cycle.


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MOSIS: Full Layout


We give a very appreciative THANK YOU to:

MOSIS Educational Program (MEP).

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MOSIS: Averaging Circuit


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MOSIS: Binary-Coded-Decimal


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MOSIS: Comparators


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MOSIS: 2° Dead Zone


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MOSIS: Setting Temperature


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MOSIS: Layout Editor


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Conclusions

Recap your main messages (key points). What is it that you want the audience to remember?

Discuss possible areas for improving the design.

Provide a sense of closure.

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Demonstration

Briefly describe what you will be demonstrating.

Tell the audience what they will see, what to look for, and why it is important.

Your demonstration should be “turn-key” and ready to go (e.g., don’t connect cables). Craig Henry has carts for your project.

Plan a contingency in case your demonstration fails to work. Bad luck does happen. A video is a good backup.

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Thank You.

Are there any questions?

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Suggestions and RestrictionsNOT PART OF YOUR PRESENTATION

1. Do not modify the style of the template. If it doesn’t fit on one slide, then add additional slides. If you make the font sizes smaller than about 20 point, the audience can not read it. Also, if you put too much on one slide the audience can not read it.

2. The next slide identifies the correct fonts and point sizes. If you have a first-level (or second-level) heading, remember to use at least two and not just one. Do not use a third-level heading.

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Times New Roman 44

• Times New Roman 32, 1st first-level– Times New Roman 28, 1st second-level– Times New Roman 28, 2nd second-level

• Times New Roman 32, 2nd first-level– Times New Roman 28, 1st second-level– Times New Roman 28, 2nd second-level

• Times New Roman 32, 3rd first-level

margin

margin

margin

margin

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3. PowerPoint may re-format the font size if you try to include too much information. Limit your text so that this does not happen. Keep everything within the defined boundaries and margins.

4. Keep your presentation text to short bullets. Do not use text that reads like a sentence. Keep it simple. Think of each text line as a newspaper headline. Lots of information, very few words.

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5. Include lots of figures, tables, or digital images. Visual material is very effective: a picture is worth a thousand words. Lots faster too. Avoid dark pictures as they will not show well on the projector.

6. Make use of color in your supporting material. Use clip art when appropriate to illustrate a point. Spice it up with color.

7. If it makes sense, animate your objects. Animation helps explain a sequence. Don’t overdo it though.

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8. If you have equations, use an equation editor to create professional-quality objects.

9. Please do not refer to your project by its project name; use only its title.

10. Because of time constraints, you will not be allowed to add files, pictures, or other audio visual material to you presentation after the cutoff date and time.

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11. Don’t assume PC in the presentation room has a certain application installed. Do not count on having access to the Internet or your P: drive.

12. Don’t overrun you time allotment and let everyone on the team speak. Leave time for questions. Your moderator will cut you off to keep on schedule.

13. Please dress appropriately and in “business” attire.

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14. You can sign up in the engineering office to reserve a room to practice your presentation.

You must do a dry run of your presentation and demonstration with your advisor prior to Founder’s Day.

cs-ee 481 1founder’s day university of portland school of engineering team steel bridge digital...

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