1. 1

2. 2 Quiz Preparation l Have Quiz sheet ready. Title = QUIZ 6 »Name (L, F, MI), »Today’s date 9/25/12, »Lab day, time »section number Lab Day/TimeSection Number Monday, 1:008 Monday, 3:009 Wed., 1:0010 Wed, 3:0011 Friday, 1:0012 Lab Day/TimeSection Number Mon. 1:008 Mon. 3:009 Tue. 2:0036 Wed. 1:0010 Wed. 3:0011 Thu. 2:0035 Fri. 1:0012

3. 3 Announcements l First professional development memo (PDM) due in lecture in 2 weeks – Oct. 9. l This week’s lab (Lab 6) has a pre-lab assignment. We will work it in class today. l Q1 – What date is PDM 1 due?

4. 4 Equipment Checkout l This week you will get your TX, RX, and MC l Checked out to Team Leader. Need Banner ID and phone #. l You can leave these in lab if you prefer.

5. 5 Motors l Everything you ever wanted to know about Lego motors – l http://www.philohome.com/motors/motorcomp.htm http://www.philohome.com/motors/motorcomp.htm l Some Diff Eq thrown in: l http://nxt-unroller.blogspot.com/2011/01/motor-controller- with-feed-forward-for.html http://nxt-unroller.blogspot.com/2011/01/motor-controller- with-feed-forward-for.html

6. 6 Lego Car Project l Wirelessly driven Lego car l Left and right channels/motors for steering l Goal is to navigate and finish course as quickly as possible

7. 7 START/ FINISH BLOCK Required Gates Optional Gates (+5 sec. penalty if missed) Push block across finish line or incur a +30 sec. penalty

8. 8 Lego Car Overview Receiver R 1, R 2 PPM PWM Motor Control Board

9. 9 Pulse Width Modulation l V o determines maximum motor speed. l Larger V o makes car go faster, but there are penalties for V o above 10V. l Set V o with a voltage regulator on the motor control board. VoVo VoVo

10. 10 Motor Control Board l Voltage regulator outputs a constant voltage Vo as long as Vin > Vo + 1.5 V. l Set Vo by choosing resistors R 1 and R 2.

11. 11 l LM 338 voltage regulator data sheetdata sheet

12. 12 Voltage Regulator l V ref and I adj are given. l Choose R 1 and R 2 to set V o. l In lab, R 1 will be given and you will vary R 2. »In the competition, you can choose both R 1 and R 2 »Only certain values of resistors are available

13. 13 Quiz Pause…. l Q2 – What determines the voltage regulator output? »(a) Resistor values »(b) Position of an adjustment knob »(c) Transmitter joystick Write the letter of your answer and also the complete answer.

14. 14 Penalties l Penalties are a way to introduce “cost” into the design and cause the team to make tradeoff decisions. »Incurring a penalty should not be considered unethical or “wrong” in any sense. l 5 second penalty for missing a gate l 30 second penalty if the block is not pushed across the finish line l Penalty of 1 second for each 0.5 V over 10V in voltage regulator output (V o ) »V o ≤10.0V = no penalty »10.0V < V o ≤10.5V = 1 second penalty »10.5V < V o ≤11.0V = 2 second penalty »etc.

15. 15 l Q3 – What is the purpose of penalties in competition scoring for ENGR 1110? »(a) Punish the unethical »(b) Introduce cost and force tradeoffs Write the letter of your answer and also the complete answer.

16. 16 Lego Car Design l Output voltage »Higher output voltage increases speed »Penalties apply above 10V l Power supply (batteries) »One 9V battery (light, but less than 10V) »Two 9V batteries (≥10V, but heavy) »Watch batteries (very light, but drain quickly) l Wheel size and gears »Torque vs. speed tradeoff l Drive strategy »Front wheel vs. rear wheel drive l Course path »Passing through all gates vs. missing gates »Pushing block vs. not pushing block l Body »Light vs. heavy

17. 17 Tables/ Spreadsheets/Graphs

18. 18 Tables vs. Graphs l Tables are an effective method for organizing and presenting design data. l Tables are good for recording and calculating precise numerical results. l Tables can be created conveniently in MS Word® or Excel®.

19. 19 Tables vs. Graphs l Graphs are effective for showing trends in the data l Graphs are effective for visually interpolating “in between” values

20. 20 Tables vs. Graphs l Q4 – Trends in data are best shown through »(a) Graphs »(b) Tables l Q5 – Precise numerical values are best shown in »(a) Graphs »(b) Tables Write the letter of your answer and also the complete answer.

21. 21 Tables vs. Graphs

22. 22 Tables vs. Graphs

23. 23 American Wire Gauge l Resistance per unit length increases with gauge

24. 24 Tables vs. Graphs

25. 25 Tables

26. 26 Table Formatting l Use the fewest lines necessary to guide the eye for a cleaner look.

27. 27 More lines than needed…

28. 28 Cleaner layout

29. 29 Table in MS Word

30. 30 Table in MS Word -- Result

31. 31 MS Word Tables l Tables in MS Word are STATIC l Potential problem: »Values in the table are related by a formula »A value in the formula changes l In MS Word, all the affected values must be recalculated and re-entered manually.

32. 32 Table in MS Excel Excel is a table!

33. 33 Tables in Excel l Excel inherently organizes material into tables. l Tables can actually calculate entries automatically. l Numbers can easily be formatted to reflect the proper type of data and precision.

34. 34 Excel Table Example l Ideal weight for a 5’0” male »110 lbs. l For every inch above 60” (5’0”) »Ideal weight increases by 5 lbs. »Ideal weight = 110+(height-60)*5 l Create a table of ideal weights for heights from 60” to 78”

35. 35 Excel Table Example l Formulas l Absolute references l Sizing of rows and columns

36. 36 Another Excel Example l Car payment »Loan Amount »Interest Rate »3 year (36 month) duration l Compute »Payment »Amortization schedule

37. 37 Pie Chart Example l New-hire engineer assignments

38. 38 Last Slide Q6 – When and where is your skit due? Ans: Tues. Oct. 16 by noon to Canvas