Enr 157 Final Design Project Sp13.doc

ENR157Final Project Spring 2013

Request for Proposal:

Al Knebel and John Wadach, owners of Electric Vehicles Inc., are requesting engineering proposals for an electronic control system for their new line of electric vehicles. The company with the winning proposal will be awarded a $100 million dollar contract to mass produce the control panels. The winning proposal must contain a working prototype that meets all required specifications along with written and oral presentations to the owners of Electric Vehicles Inc.

Prototype Specifications:

Labeling and Accessibility:All input and output devices must be clearly labeled. Components must be located so that the user can easily operate the system.

Neat Wiring:Wires must lie flat on the circuit board whenever possible. To allow components to be easily replaced, wires should not go over components.Cables running between boards should be neatly bundled and labeled. Spools of wire are available in 9-156A for making long lengths of wire.

Current Limitations in Switches:Switches are only to be used to create logic level voltage signals (0 to 5v), not to source or sink current to or from devices. No switch may source or sink more than 5 mA.

The example below demonstrates the proper way to use a switch to light an LED.

The example below demonstrates the wrong way to use a switch to light an LED.

Note: The LEDs on the trainer have 74LS06 inverters connected to them so switches may be connected directly to them.

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Required Subsystems:

1. Three-switch Keyless Entry

Input Devices: Three toggle switches and a system reset button

Output Devices: Green LED, Yellow LED

Function:

If the correct switch sequence is entered, the Green LED must light and the system becomes fully operational. If the incorrect sequence is entered, the Yellow LED must light and the system must prevent rotation of the motors. To reset the system the three switches must be returned to their low (0v) positions and the system reset button must be pressed. The user may then enter a new sequence.

2. Seatbelt Sensor

Input Device: Photo-interrupter and small piece of electrical tape

Output Device: Red LED

Function:

Once the system is powered up, the red LED must remain lit until the "seatbelt buckle" (piece of electrical tape) is inserted into the slot of the photo-interrupter. Whenever the "seatbelt buckle" is inserted into the slot the red LED must be off.

3. Horn

Input Device: Pushbutton Switch

Output Device: Piezo Speaker

Function:

Whenever the pushbutton is pressed, the horn must emit a high-pitched sound.The horn must also sound anytime the motors are running in reverse and an obstacle is closer than 10 cm to the back of the vehicle.

4. Headlight

Input Devices: Photo-resistor and toggle switch

Output Device: 40W bulb and an Optical Relay inside a metal junction box.

Function:

The headlight bulb must go on if the toggle switch is flipped on, or the ambient light falls below a threshold level, or the windshield wipers are on.

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5. Windshield Wiper

Input Device: Toggle Switch

Output Device: Servo Motor

Function:

Whenever the toggle switch is on, the servo motor must rotate back and forth and the headlight must go on.

6. Directional Signals

Input Devices: Left and Right Pushbutton Switches

Output Devices: Left and Right Green Directional LEDs and a RED Hazard LED

Function:

If the left pushbutton switch is pressed, the green left LED should blink at a reasonable frequency. Likewise, the right switch and green LED should work similarly. If both the left and right pushbuttons are pressed simultaneously, neither green LED should light, and the red hazard LED should blink at a reasonable frequency.

7. Motors

Input Devices: Two Toggle Switches

Output Device: Two Geared DC Motors Mounted on a Wooden Chassis and a Yellow Backup LED

Function:

If the keyless entry code is correct, the two motor control toggle switches should allow the user to select three different modes: Neutral (motors off), Forward, and Reverse. If the correct entry sequence has not been entered properly, the motors must not rotate in any mode.

If the motors are running in reverse the yellow backup LED must light. The side of the Wooden Chassis with the Sharp Distance Sensor is considered the back of the vehicle.

8. Brake

Input Device: Pushbutton Switch

Output Devices: Red Brake Light, Two DC Motors described in item 7 above.

Function:

If the brake switch is pressed, the brake light must come on and the motors must stop rotating.

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9. Reverse Obstruction Sensor

Input Devices: Sharp Distance Sensor Mounted on a Wooden Chassis

Output Devices: Red Brake Light from item 8 above, Two DC Motors from item 7 above.

Function:

If the motors are running in reverse and an obstacle is closer than 10 cm to the back of the vehicle, the motors must stop rotating, the brake light must come on, and the horn must sound. If the motors are running forward, the motor should continue rotating, the horn should stay off, and the brake light should come on to warn the tailgating driver that they are too close.

10. Subsystem Enhancement

Your team must add one subsystem enhancement to your system. You may select from the list below or choose something of your own with instructor approval.

For students who complete items 1-9 above and one subsystem enhancement, bonus points will be awarded for completing more than one subsystem enhancement. Note: Bonus points are not available unless 10 subsystems are functioning correctly on the prototype.

Options for Subsystem Enhancements (Choose one)

a. Power Door Lock

Input Device: 2 Pushbuttons (one for lock and one for unlock)

Output Device: Servo Motor

Function:

At power-up of the system, the servo motor should be in the locked door position. If the 3-switch sequence is entered correctly, the servo should turn to unlock the door. With the system operational, the driver should be able to use the lock and unlock pushbutton switches to toggle the servo position to lock and unlock the door.

b. Climate Control Fan

Input Device: LM34 Fahrenheit Temperature Sensor (See Lab 13 Closed Loop Temp Control)

Output Device: 12 Volt Fan (the motor from Lab 9 DC Motor Control may be used instead)

Function:

If the temperature of the sensor rises above room temperature the fan should go on to cool the car’s interior. When the temperature returns to room temperature the fan should go off.

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c. Emergency Light Bar

Input Device: Toggle Switch

Output Device: At least 4 Red LEDs or an Integrated 8-LED Package (available in 9-156)

Function:

When the toggle switch is moved to the on position, the red LEDs should go on and off similar to the effect that a Ring or Johnson Shift register would cause. See the textbook for more information on Shift Registers.

d. Radio Station Selector

Input Device: Pushbutton

Output Device: Seven Segment LED Display

Function:

By pressing the pushbutton the radio station number increments by one as displayed on the Seven Segment Display. A total of 10 stations numbers (0-9) should be able to be chosen.

e. Anti-Theft Device

Input Device: Toggle Switch

Output Device: Horn (Item 3 above) and Headlight (Item 4 above)

Function:

If the toggle switch is moved to the on position prior to a person entering the correct 3-Switch Keyless Entry sequence, the horn and headlights should go on and off if any of the three entry switches are moved to their on position. In addition, the system may not become operational and the motors may not rotate if the anti-theft switch is in the on position.

The anti-theft switch should not affect the operation of the car if the toggle switch is turned on after the car system is operational. This means that if the correct 3-switch entry sequence has already been entered, the anti-theft switch should be inoperable.

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Written Design Proposal

Your Written Design Proposal must contain the following items.

1. A Cover Page with your company name and logo, names of your engineers, and the date.

2. A table of contents including page numbers. All pages in the report must be numbered.

3. An executive summary that includes the following:

a. A paragraph describing the problem that you solved.

b. Persuasive arguments why your design, prototype, and documentation are the preferred solutions to the problem. Special attention should be given to the subsystem enhancement that you added to your system and why it will appeal to consumers.

c. A table that summarizes the testing results for your 10 required subsystems and any bonus subsystems that you created. Your table should include the following columns: Subsystem Name, Points Earned, Maximum Points Possible. (Your full testing score sheet will be included later in the report)

d. A table summarizing the cost of each of your 10 required subsystems and others if done for bonus. Your table should include two columns: Subsystem Name, Cost. At the bottom of the table show the sum of the cost of all 10 subsystems plus any bonus subsystems. (Your full Bill of Materials will be included later in the report)

4. A diagram of your prototype showing only the positions of all input and output devices. Each input and output device should be clearly labeled. You may use SolidWorks or Viseo (part of Microsoft Office at MCC) to create your diagram. Your diagram should make it possible for a person to locate all input and output devices on your prototype even if labels are missing from your prototype. You should not include wires, ICs, or other components that users of the system will not need to know about.

You must add a description of why your prototype layout will be intuitive and easy for users to operate.

5. A Technical Service Manual to be used by Electric Vehicles Inc. service technicians. This manual must contain well commented program code and circuit schematics for all subsystems. Your circuit diagrams must contain part names and numbers, pin numbers, and any other information that will allow our technicians to build, test, and repair all subsystems.

Multisim or Viseo printouts of each subsystem circuit are preferred.

For each subsystem you must provide a detailed technical description of how and why the subsystem works in the way you designed it.

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If a microcontroller is used, you must include a flow chart that outlines how the program works as well as a printout of your program that contains plenty of comments so our technicians can easily understand and test your program.

6. A written summary of your testing results along with explanations what was wrong with systems that did not receive perfect scores. Following this summary a copy of your original testing sheet from lab must be included.

7. A complete Bill of Materials for your prototype. For all the components used in your design you must include the following information: The common name of the part, the vendor where the part can be purchased, the part number, the quantity of the part needed, the unit price, and the total price (unit price x quantity).

Nearly all parts for this project can be purchased from the following vendors: jameco.com, digi-key.com, parallax.com, and towerhobbies.com. If you used components from the digital trainer such as switches, power supplies, speakers, LEDs, pots, hex displays, clock signals, or other items, you must find and include the individual price of these components when purchased separately.

Your Bill of Materials should be organized by subsystems so that Green Vehicles Inc. will be able to make decisions on whether to include individual subsystems. The total cost of the entire system must also be presented.

8. A conclusion that contains the following items:

A. An assessment of the strengths of your project and why it constitutes an optimal solution to the problem. Special emphasis should be put on the subsystem enhancement that you included.

B. A discussion of your team’s deficiencies and how you would improve on your performance if given another chance to solve this problem.

C. An assessment of your project cost along with ideas for reducing the cost.

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An Oral PowerPoint Presentation (10 minute maximum)

Your Oral Presentation must contain the following items.

1. An opening attention getter that grabs the attention of the audience. As part of your attention getter, describe the strongest aspects of your project so that the audience will be motivated to listen to your presentation.

2. An introductory slide with your company name, names of your engineers, and the date. This is where you should introduce your team and convince the company owners that your team can be trusted with a $100 million contract. Do not introduce your team until after the attention getter is over! Get their attention first, then tell them who you are.

3. A slide outlining the topics to be covered in your presentation that includes a:

A. Prototype DiagramB. Discussion of your Subsystem EnhancementC. Table summarizing your testing ResultsD. Table summarizing your Bill of MaterialsE. Conclusion

4. Prototype Diagram and Why Your Layout is User Friendly

Display your diagram showing the input and output devices and discuss why your system will be easy for non-technical users to operate.

5. Discussion of your Subsystem Enhancement

Show the circuit diagram for your subsystem enhancement and give a technical description of how and why the circuit works in the manner that it does.

6. A Table summarizing your testing Results (same as part 3c from the written report)

7. A Table summarizing your Bill of Materials (same as part 3d from the written report)

8. A Conclusion where you discuss items 8a-8c from the written report.

9. Good Presentation Style that addresses the following:

i. Professional Appearance

a. You are expected to wear dress pants, a dress shirt or a nice polo shirt, and shoes. T-shirts, baseball hats, sandals, logos, jeans, and shirts that are not tucked in will provide an unfavorable impression to your instructor evaluating your presentation.

b. Posture: Stand straight but not rigid, don’t lean against anything, and don’t cross your legs.c. Hands: Avoid unnecessary movement that will be distracting to the audience.

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ii. Eye Contact and Body Position

a. Never read a speech. Be familiar with your material so that you do not need to constantly look at your notes or the display screen. Reading a speech will bore the audience and will not allow you to make a connection with them.

b. Scan the room and attempt to look at everyone in the room multiple times. Don’t look only at the instructor. Addressing audience members by name is an effective way to connect with them.

c. When using the overhead screen, keep the front of your body facing the audience. Keep your body on the side of the screen so that you don’t block the line of sight of anyone. Using a pointer is helpful in keeping your body out of the way.

d. When your partner is speaking, sit down or stand far to the side so that you are out of the line of sight from the audience to the screen.

iii. Voice and Expression

a. Speak with sufficient volume so that you can easily be heard.b. Never chew gum, tobacco, or suck on hard candy during a speech.c. Speak with expression and enthusiasm.

iv. Visual Aids

a. Make your PowerPoint presentation visually appealing. Make a backup so you will be prepared if the technology fails.

b. Don’t put too much text on each slide. List only key words.c. Don’t have too many slides. Make sure the audience has time to absorb the content of each

slide.

v. Punctuality and Equal Participation

Students are required to be present for the entire final exam period. Arriving late or leaving early will result in loss of points. Each student should speak for approximately 5 minutes each.

II. Proposal Deadlines and Grading

1. Prototype Testing Due Date: To be announced by your lab instructor.

2. Written Proposal: At the start of your final exam period.

3. Oral Presentation: During your final exam period.

4. Failure to meet any of the deadlines will disqualify your team from being considered for the award of the $100 million contract (and have a very detrimental impact on your grade). The executives of Electric Vehicles Inc. are not interested in your excuses so save them for the hundreds of employees in your company who will be laid off because you couldn’t meet the deadlines.

5. Your grade for the project will be computed using the following formula.

Project Grade = (Prototype Score + Written Score + Oral Score) / 370

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Enr 157 Electronic Car Prototype Testing Sheet Spring 2013

Names __________________________________________________________________Point Total (170 max) _____________

1. Keyless Entry: Motor Activated & Green LED On (5) ________

Motor Lockout & Yellow LED On (5) ________Keyless Entry Total (10) ________

2. Seatbelt Sensor: Red LED On if "Buckle" Not Inserted (10) ________Seatbelt Total (10) ________

3. Horn: High Pitched Sound when Button Pressed (5) ________

Sounds when Rear Obstacle Detected (5) ________Horn Total (10) ________

4. Headlights: On when Toggle On (5) ________

On when Ambient Light Level is Low (10) ________

On when Wiper is On (5) ________Headlight Total (20) ________

5. Windshield Wiper: Rotates Back and Forth When Toggle On (10) ________Wiper Total (10) ________

6. Directional Signal: Left Green LED Blinks at Low Rate only if Left Switch Pressed (5) ________

Right Green LED Blinks at Low Rate only if Right Switch Pressed (5) ________

Red LED Blinks at Low Rate if both Left and Right Switches Pressed (5) ________

Signal Total (15) ________

7. Motor: Off Anytime Switches are in the Neutral Position (working motor) (5) ________

Spins Forward with Switches in Forward Position & Activated (5) ________

Spins Backward with Switches in Backward Position & Yellow Backup Light on (10) ________

Motor Total (20) ________

8. Brake: Red LED On when Brake Button Pressed (5) ________

Motors Off when Pressed (Forward & Reverse) (10) ________Brake Total (15) ________

9. Rear ObstructionSensor: Red Brake LED on when Object < 10cm (Forward or Reverse) (5) ________

Horn on only if Motor in Reverse and Object < 10cm (5) ________

Motor Goes Off only if in Reverse when Object < 10cm (10) ________Rear Obstruction Total (20) ________

10. Subsystem Name of Subsystem(s) ___________________________________________________Enhancement: Comments:

Subsystem Enhancement Total (20) ________

Bonus Total (?) ________

11. Circuit Neatness: Good Layout, Well Labeled, Neat Wiring Circuit Neatness Total (20) ________

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ENR 157 Final Written Design Report Grading Sheet Spring 2013

Names ______________________________________________________________ Point Total (100 max)_____________

1. Cover Page: Company name, logo, names of engineers, and date. (5 pts) ________

2. Table of Contents: Include page numbers and all pages in report numbered. (5 pts) ________

3. Executive Summary: Problem Solved, Why Optimal, Testing, Cost (20 pts) _______

4. Prototype Diagram: Diagram of input/output devices, why it’s easy to use. (10 pts) _______

5. Service Manual: Circuit Diagrams, Technical Descriptions, Flow-Chart, Programming Code. (30 pts) _______

6. Results: Summary of Results and a copy of the Testing Sheet from lab (10 pts) _______

7. Bill of Materials: Name, Vendor, Part Number, Quantity, Unit Price, Totals Per Part, Subsystem Totals, Entire System Total (10 pts) _______

8. Conclusion: Assessments of Strengths, Deficiencies, Cost (10 pts) _______

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Enr 153 Final Oral Design Report Grading Sheet Spring 2013

Name ______________________________________________________________ Point Total (max 100) _____________

Name ______________________________________________________________ Point Total (max 100) _____________

1. Attention Getter: Enthusiastically draws audience attention to the strengths of your design. (10 pts) ________

2&3. Introduction: Introduce team, show slide listing what you will cover in your presentation. (10 pts) ________

4. Prototype Diagram: Diagram of input/output devices, why it’s easy to use.(10 pts) ________

5. Subsystem Enhancement: Circuit Diagram, Technical Description (20 pts) ________

6. Results: Summary of Testing Results(10 pts) ________

7. Bill of Materials Summary: Subsystem Costs and Total System Cost (10 pts) ________

8. Conclusion: Assessments of Strengths, Deficiencies, Cost(10 pts) ________

Total Content Score (out of 80)_____________

9. Presentation Style: Appearance, Eye Contact& Body Position, Voice, Visual Aids, Punctuality and Equal Contribution

Presentation Score for __________________________________________ Score (out of 20)_____________

Presentation Score for __________________________________________ Score (out of 20)_____________

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