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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

10

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