Final Report - PowerPoint Presentation

Slide1

Final Report

Stephen

Joo

and Daniel

Kattan

April 16, 2010

ECE 002, Group 8Slide2

Group 8Slide3

We, Stephen Joo

and Daniel

Kattan are Group 8 of ECE 002. Throughout the semester, we have learned many things with each lab. We have faced many challenges and through them learned a lot. The different projects in ECE 2 gave us a taste of what’s to come in the next few semesters of engineering here at GW.IntroductionSlide4

Lab

introduced different types of sensors

Taught how to test different sensors to determine optimal range of use as well as how to write program using those sensorsSensors tested: light sensorsonar sensoroptical rangefindertouch sensor

These were critical in

next

project, creating and programming

an elevator.

Sensors LabSlide5

P

rovided

fairly stable results over the entire spectrumUseful for wide range of applicationsCan reliably detect differences between not only white and black but also different scales of grayCan be used to detect subtle changes in lighting, not just shift from black to white

Light Sensor resultsSlide6

Results somewhat

unpleasant because only accurate within

certain rangeAccording to results, sensor goes haywire and gives extreme values or values that are indiscernible from those around them (i.e. nonlinear) just outside of small normal rangeMakes this sensor ill-suited to all but very crude applications.Rangefinder sensor resultsSlide7

Results extremely

accurate and precise

When we made graph based on data, sensor provided extremely linear graph. Sensor is ideal for any application for measuring distances since it provides consistent and stable results at any certain distance.Sonar sensor resultsSlide8

Results from these tests greatly influenced

which

sensors to use for elevator projectWe decided to use Because sonar sensor had such linear and stable results, it as primary sensor for elevatorRangefinder had varied results and felt it would be unreliable for use in projectDidn’t

use light sensor either because

it had

little use in our design

Sensor lab conclusion:Slide9

Unique design:

using only one

sensor, which is sonar sensorElevator call buttons were start and stop buttons on HandyboardGroup felt we would have a simpler code by using only one sensor While somewhat true, the code became more

complicated to write than initially anticipatedTrials:

- rewrote code

several times until

got

it working properly.

- had

to fine tune

timing

of the elevator car.

Elevator ProjectSlide10

Design:

simple

and easy to construct and was reliable in its operationstreamlined stopping to simply turning off motorenough friction was built into raising/lowering mechanism to ensure elevator stayed in place whenever motor was

off

Elevator

Project (

cotd

)Slide11

Work on elevator: mostly Daniel

Kattan

Work on elevator code: mostly Stephen JooWe did a lot of work together to ensure that physical elevator would work properly with the codeElevator Project (cotd)Slide12

Instrumentation

lab exposed us to

different

instruments used by computer

engineers

Oscilloscope used

for measuring

voltage changing

with time and

displays it

in

graphical format

Voltage displayed

as

sine

wave (if

AC

current

)

Used

to display most

EM waves

Dials

on

control

panel are manipulated to produce

unique

graph

shown on display monitor

Input channels allow cables of two distinct functions via two channelsOscilloscope includes function generator which can easily change amplitude, frequency, shape of the graph, and moreAllows one to see how things should look before testing his/her circuits

Instrumentation and Circuit LabsSlide13

DC

power supply

source:- gives varying amounts of power to circuits- used to supply constant voltage to circuit; this voltage can be changed to see how circuit reacts to different voltages- many of these changes are measured using oscilloscope

Instrumentation Lab (cotd)Slide14

In another lab, we

used breadboard

to build

physical

circuit and connect it to

DC

power supply source

for power

We measured voltage

, current, and resistance at different points around

circuit

Lab

allowed us to actually see what we

learned

in

class; by

actually building and measuring the circuits, we

understand

better what is going on

Circuit LabSlide15

Simulation

Program with Integrated Circuit

Emphasis:used for analog and digital circuit design and educational purposeswe designed circuit blueprints via this program by adding various resistors, capacitors, voltage sources, ground, and link them all together into uniform circuitprogram allows you to test various circuits to ensure working design before actually building themby building/testing circuit

in PSPICE before physically building it, engineers can try out different designs and save time and

money

The

following two images are circuit designs of various homework problems.

PSPICE LabSlide16

PSPICE picturesSlide17

Learned

how to make

own

AM radio by soldering and connecting parts from

AM

radio

kit

L

earned

how to solder

correctly

Split

up

work

of soldering

parts

evenly between

two

of us so

both got

practice soldering

joints

Once radio

was

complete,

we could use

oscilloscope

to test

frequency

of incoming signal.AM Radio Lab:Slide18

Problem:

- trouble

with

larger

solder joints because

soldering

iron didn’t get hot enough to melt

solder quickly

Solution:

- soon

figured out that if we held

soldering

iron against

joint

and wire for

minute

or

two it

heats up enough to allow

solder

to flow evenly over

joint

Would

have been helpful to have different tips for

soldering

iron to have greater precision

for our

work

AM Radio Lab (

cotd

)Slide19

Overall, the projects have helped us become better engineers and better team players

We encountered many problems faced by engineers like coordinating the simultaneous development of hardware and software.

We became better team players through our need to finish projects outside of classtimeConclusion