1. SENIOR DESIGN PROJECT
1/30/06

2. RELAYS AGAIN
Microcontroller->Transistor->Solenoid

3. RELAYS AGAIN

4. RELAYS AGAIN Solid State Relays (SSR)
DC Solid State: opto-isolation, very fast (PWM), very low power, drive directly from
Microcontroller.
AC Solid State: same as above, may not be able to switch faster than the AC
Signal frequency. (used in light dimmers)

5. RELAYS vs. Transistor Switch
Mechanical Relay: cheap, makes little noise, visible
Mechanical motion.
Solid State Relay: opto-isolation, very fast (PWM),
very low power, drive directly from microcontroller.
Transistor Switch: very cheap, small, fast.

6. MOTORS AGAIN Hobby Servo:
Built in Encoder -- Built in Servo Controller
+V, GND, Signal
Give the signal line a PWM value. (like PWM)
ATT: Pulse Width DEFINES POSITION, NOT SPEED
Pulse Width Signal created by Built Servo Controller.
[the above is true for hobby servos. It allows for cheap
Motors. Industrial servos, use different control
Techniques….]

7. MOTORS AGAIN
Stepper Motor
[Electro-Magnets]

8. MOTORS AGAIN
DC MOTOR
COMMUTATOR
BRUSHES

9. SENSORS RESISTIVE SENSORS: CAPACITIVE: PIEZO ELECTRIC PYRO ELECTRIC
(change resistance)
“Photocell”
“Bend Sensors”
“CO sensor”
CAPACITIVE:
(change capacitance)
“Condenser microphones”
“Touch Sensors”
PIEZO ELECTRIC
PYRO ELECTRIC
SONARS

10. SENSORS PIEZO ELECTRIC: PYRO ELECTRIC
Create voltage when bent / when voltage across
they bend… .
some capacitive sensors have
digital-out built in.
PYRO ELECTRIC
Warps when exposed to heat. => change capacitance
(“Motion Infrared Sensors”)

11. SENSORS SONARS PHOTOTRANSISTOR Light controlled switches
Emit sound and record time it takes for sound waves to return.
(reflection, angle, complications…)
PHOTOTRANSISTOR
Light controlled switches
(base current created with photons)

12. SENSORS INFRARED REFLECTION SENSORS IR OPTICAL SWITCH
Transmitter / Receiver in one package or two.
(record reflection time, similar to sonars; can be used as collision
detection sensors or data link.)
IR OPTICAL SWITCH
IR LED + PHOTOTRANSISTOR

13. SENSORS BARCODES, RFID, ACCELEROMETERS, THERMISTORS,
HUMIDITY, SENSORS, GYROSCOPES (how fast you’re
turning)… .

14. PROJECT PROPOSAL 0. Team 1. Short 3 Sentence Summary
Word Description
3a. Floatchart
3b. Open questions lists. (what do you not know and how are you planning to find out?)
4. Timeline
5. Partslist

15. PROJECT PROPOSAL 0. Form Teams, sign-up on elearning.
Team name should be same as project name.
1.Short 3 Sentence Summary (“elevator pitch”)
Word Description:
What ? Why ? How? For Whom?
[objectives / research goals /
user / client base]
project should ideally address a social, political or environmental theme of your interest;

16. 3a. Float chart
FLOAT CHART

17. PROJECT PROPOSAL
3b. Open questions lists. (what do you not know and how are you planning to find out?)
BE SPECIFIC!!

18. PROJECT PROPOSAL 4. Timeline & Task Division [calendar]
(week by week break-up. “Who is doing what when”)
5. Parts list and Manufacturers;

19. PROJECT PROPOSAL FORMAT: Powerpoint and/or html.
Prepare prepare minute presentation.

20. PIGEONBLOG
PigeonBlog, provides an alternative way to participate in environmental air pollution data
gathering. The project equips urban homing pigeons with GPS enabled electronic air
pollution sensing devices capable of sending real-time location based air pollution and
image data to an online mapping/blogging environment.

21. ANNOUNCEMENTS FEB 6: project proposal presentations; EAGLE overview.
FEB 13: Roachbot demo, FAB reading 2 due.
Fab reading discussion.

22. ENGAGING AMBIVALENCE 1. On page two the authors mention that "..
DARPA is in the business of creating and satisfying desire."
What type of desire are they talking about? What is your take on this?
(200 words)
2. What types of problematic outcomes do the authors perceive to be inherent
in what they call the "da Vinci" impulse and the "Dilbert" impulse?
Do you agree? (300 words)
3. How do the two aspects above relate to engineering culture in more general
terms? Do you find any of that within your own education?
[Feel free to add any comments/thoughts you might have on this article as a whole.]
( words)