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ENGG 1203 Tutorial
Introduction to Electrical and Electronic Engineering – 2014 Spring Semester
Time and Venue Class: 1430 – 1520 CYPP3, every Friday
Tutor Leon LEI (me): CB 806
Michael CHAN: CB 515
Contact TAs and me via Piazza
Tutorial materials
http://www.eee.hku.hk/~culei/ENGG1203.html
Tutorial Schedule (Tentative)
--/-- Introduction
2/31 Lunar New Year
2/7 Digital Logic
2/14 Digital Logic
2/21 Digital Logic
2/28 Circuit
3/7 Circuit
3/14 Reading Week
3/21 ** Mid Term **
3/28 Signal
4/4 Signal
4/11 Signal
4/18 Good Friday
4/26 N/A
5/2 N/A
5/X Revision
--/-- Computer
3 4
ENGG 1203 Tutorial
Tutorial materials
Regular tutorials
Project facilitation tutorial
Revision tutorial before examination (Tentatively)
ENGG 1203 Admin Q&A
Lecture/Lab materials, announcements Course site
http://www.eee.hku.hk/~engg1203/sp14/index.html
Moodle HKU Computer Center
http://www.its.hku.hk/lms/moodle/v2/support_student.php
Prompt helping, finding groupmates, asking
lecture/tutorial/homework questions Piazza
https://piazza.com/#spring2014/engg1203
Admin help Piazza (Private post)
Extra lab check-off session TA office hour (CB LG205)
Thu 1530 – 1730, Fri 1530 – 1730 (Tentative)
Textbook No textbook
5 6
ENGG 1203 Tutorial
Course and Circuits
N/A
Learning Objectives
Outline the course, the tutorial and the project
Revise basic concept of electrical circuits
News
TBD
Ack.: UPenn Intro to OM
IPhone 4S ↔ EEE …
8 megapixel camera Linear oscillating vibrator
Battery
Light sensor and
IR LED for the
proximity sensor
960 x 640
pixel Retina
display
IPhone 4S ↔ EEE …- Touchscreen
controller
- Gyroscope
- Three-axis
accelerometer
- Audio codec chip
- Dual-core Processor
- RF Transceiver (Analog)
- Power Amplifier
- Surface acoustic wave filter
Dual-core
processor with
RAM
Siri /
iCloud
Source: http://www.ifixit.com/Teardown/iPhone-4S-Teardown/6610/1
IPhone 4S ↔ ENGG1203 …
Sensors, Actuators
Measure and manipulate the physicalenvironment
Computer Systems
Compute, control and decide
Digital Logic
Assemble acomputer system
Electrical Circuit
Assemble digital logic,convert signals
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11
SP13 Champion!
12
Project: Death of “Professor’s
Negation Field” Design a rigid, reliable and robust machine
13
Rube Goldberg Machine
Make sure that every part is working…
Components, terminals, wires, connections
14
START button
Ou
tpu
t
Ou
tpu
t
Inp
ut
Actu
ato
r to
po
p th
e
ba
lloo
n
Inp
ut
90%
work
90%
work
90%
work
90%
work
90%
work
90%
work
90%
work
53.14% work
Brief Plan for the Project
A brief plan for the project construction
No technical requirement
A way to start thinking about the project
A block diagram with illustrations
Showing how the machine works after pressing the START button
No fire/chemicals/heat/explosion/knife
No water Use green beans
Lego bricks are fine…
15
A Stage in the Rube Goldberg
Machine In a stage, an electrical sensor is triggered by an
external mechanical input, the sensor then switches on the actuator(s) through buffers.
Electrical actuator then moves mechanical parts, which finally trigger the electrical sensor in the next stage.
16
Actu
ato
r
Se
nso
r
Bu
ffe
r
Electrical signal
Mechanical
signal for
next stage
Mechanical signal
from previous stage Me
ch
an
ica
l
pa
rt
A Partial Stage in the Rube Goldberg
Machine
17
Sensor (Push)
Actuator (Push)
Sensor (Rotation)
Actuator (Push)
Buffer
A Partial Stage in the Rube Goldberg
Machine
18
Sensor(Non contact)
Actuator (Fan)
Buffer Actuator (Light)
A Partial Stage in the Rube Goldberg
Machine Ball counting circuit:
A sensor only
Light tracking circuit:Sensor + Buffer +Actuator (Not yet acomplete stage)
19
Actu
ato
r
Se
nso
r
Bu
ffe
r
Me
ch
an
ica
l
pa
rt
Stages in the Rube Goldberg Machine
20
Sensor(Button)
Actuator (Fan)
Buffer
Actuator (Rotation)
Mechanical parts
Sensor(Rotation)
Buffer
(Mechanical parts in the second stage are missed.)
In order to build a reliable machine
Carefully work on every Lab session
Know what you have to do and want to do
Implement the
machine neatly
Place the
component
carefully
99.99% work
for every stage
21
Four Dimensions of Performance
22
Cost
Efficiency
Measured by:- cost per unit- utilization
Time
Responsiveness to demand
Measured by:- customer lead time- flow time
Quality
Product quality (how good?)=> Price
Process quality (as good as promised?)=> Defect rate
Variety
Customer heterogeneity
Measured by:- number of options- flexibility / set-ups- make-to-order
Good Production Practice: Toyota
Production System (TPS) Eliminate waste (muda)
Design out overburden
(muri)
Ensure that the process is
as flexible as necessary
without stress
Design out inconsistency
(mura)
Designing a process \
capable of delivering the required results smoothly
23
Waste: Rework
Repetition or correction of a process Major problem in the project!
Rework is failure to meet the “do it right the first time” expectation
Can be caused by methods, materials, machines, or manpower (Check carefully at the beginning!)
Example: Rewash the dish after it has been
poorly washed; Reconnect the circuit system
N times
Solution: Analyze and solve root causes
24
Waste: Over-processing
Processing beyond what the project requires May result from internal standards that do not
reflect true requirements
Not enough time to work on other parts
Example: Stirring a fully mixed cup of coffee; Building many fancy mechanical stages, but no electrical stages
Solution: Know what is required
25
Waste: Transportation
Unnecessary movement of parts or people between processes
Example: Building a dining room and kitchen at opposite ends of a house, then keeping it that way Create handling damage and cause delays
Example: Fishing in the Indian Ocean
Solution: Relocate processes for
transportation
26
Waste: Motion
Unnecessary movement of parts or people within a process Result of a poor working procedure and route
Example: Locating (and keeping) a refrigerator outside the kitchen; Finding equipment and tools
Solution: Arrange procedure, people and
parts around stations with work content to
minimize motion
27
In order to manage quality
Avoid defects by
keeping variation
out of the process
If there is variation,
create an “alarm”
and trigger process
improvement
actions
28
Detect, stop, alert
Jidoka
Andon cord
Root-cause
problem-solving
Ishikawa Diagram
Kaizen
Avoid
Poka Yoke
Build-in quality
Toyota Quality System
Detecting Abnormal Conditions
Detect – Stop – Alert
If equipment malfunctions / gets out of
control, please shuts it down at once to
prevent further damage
Power supply
Transformers, motors
Root Cause Problem Solving
Ishikawa Diagram
A brainstorming technique of what might have
contributed to a problem
Electrical Safety and Lab Safety
5-10 ma can cause death
Death can result from as low as 50 volts
NO Slippers and NO Sandals in the Lab
Electric sockets are not overloaded
The floor is dry and in good condition
Exits are not obstructed
Report TAs or technicians for any
emergency cases
Digital Multi-meter (DMM)
Diagnosis tool
Wrong connections?
Voltage DC: 2mv-1000v
24m, 240m, 2.4, 24, 240
Resistance: 2Ω-2MΩ
Turn off the DMM if you
are not using
Don’t measure current if
it is not needed
Lab Check-off
Extra TA office hours for lab check-off
Thu 1530 – 1730; Fri 1530 – 1730
To speed up lab check-off process
Read the instruction sheet before lab session
Log in lab check-off system and think of answers
before calling TAs
If you (pl.) have multiple check-off, log in different
HKU Portal accounts via different internet
browsers first (IE, Firefox and Chrome)
33
Lab Check-off
34
12
3
Appendix: Procedures in top-down
and bottom-up Making a Rube Goldberg Machine (Top-down)
Decide the types of stages according to the location,
number of stages, and interface of each stage
Design stages according to the types of stages, input
and output requirements
Find out the required components for each stage
Get all things ready (e.g. acquire from the technician)
Prepare and assemble each stage
Combine each stage together
Fine-tune the connection between stages
35
Appendix: Procedures in top-down
and bottom-up Making a Rube Goldberg Machine (Bottom-up)
Find out the components available
Mix and match available components as different
stages to meet the project requirements such as types
of stages according to the location, number of stages,
and interface of each stage etc.
Prepare and assemble each stage by the given
equipment
Combine each stage together
Fine-tune the connection between stages
36