finished an approach to designing seven segment static displ

8/13/2019 Finished an Approach to Designing Seven Segment Static Displ

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AN EFFECTIVE APPROACH TO DESIGNING SEVEN SEGMENT STATIC DISPLAY SYSTEMS WITH

COMPLETE CHARACTER REPRESENTATION

1Ezekwe Chinwe Genevra, 2Okwu Patrick Ikechukwu,2Mbonu ekene Samuel,4Ue !naemeka Gowill,

1, 2, 3 & 4 Electronics Development Institute, Awka

National agency for cience an! Engineering Infrastructure "NAENI#

$e!eral ministry of cience an! %ecnology, Nigeria

norakin"chi#$ahoo%com,okwu&i#"mail%commbo'eke'(am#$ahoo%com,4"owillnnaemeka#"mail%com,

ABSTRACT

A seven-segment dis!"#$ %& seven-segment

indi'"t%&$ is " (%&m %(e't&%ni' dis!"# devi'e (%&

dis!"#ing de'im"! "!)"*ets-n+me&"!s t)"t is "n

"!te&n"tive t% t)e m%&e '%m!e, d%t-m"t&i,

dis!"#s N%&m"!!# seven segment dis!"# !ette&

(&%m "-g t)en n+m*e&s (&%m .-/ 0+ite +n!i1e nine-

segment$ (%+&teen-segment "nd si,teen-segment

D+e t% t)ese !imit"ti%ns$ m%st dis!"# &%2e'ts g%

(%& d%t m"t&i, dis!"# even 3it) t)e "dv"nt"ges %(

s)"& dis!"# "nd "v"i!"*i!it# %( seven segments

T)is "e& &esents v"&i%+s 3"#s %( '%m*ining

t3% seven segment dis!"# t% "')ieve %t)e& !ette&s

(&%m )-4 +sing ie'e-3ise '%ntin+%+s "!g%&it)m

vi" "n "ssem*!# '%ded mi'&%'%nt&%!!e&

5AT6/C789 T)e "e& "!s% &esents "n "')ieved

)#si'"! &%2e't 3it) seven- segment (%& ("'+!t# %(

s'ien'e in t)e (%&m :FAC;LTY OF SCIENCE


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T"*!e 8 Seven-segment t&+t) t"*!e

In a!!ition to te ten numerals, seven segment

!isplays can (e use! to sow letters of te 0atin)3*,

yrillic an! reek alpa(ets inclu!ing punctuation,

(ut only few representations are unam(iguous an!

intuitive at te same time uppercase),*, C,E,+, G,

,I,-,., O,P, S, U, , an! lowercase a, b, c, ,", h, i,

n, o, /, r, t, u' %us, a! oc an! corporate solutions

!ominate te fiel! of alpa(etic on seven5segment

!isplays, wic is usually not consi!ere! essential

an! only use! for (asic notifications, suc as internal

test messages on euipment un!er !evelopment'

II' STATEMENT OF PROBLEM

In Nigeria, Englis language is te general language

spoken an! un!erstoo! (y almost all an! tere are

twenty5 si. letters of Englis language' even

segment !isplay (eing te most common !oes not

!isplay all upper an! lower case alpa(et' %is as

move! most !isplay !esigners away from seven

segment to !ot matri. !isplay even wen it is te

most efficient an! effective in luminosity' In or!er to

solve tis pro(lem an! increase te usa(ility of seven

segment, we em(arke! into tis researc using

$A60%7 +$ IENE8 as our case stu!y troug

piece5wise continuous algoritm '

III O*2e'tive %( st+d#

%is researc work is (ase! on te knowle!ge of

seven5segment !isplay an! more specifically on te

creation of piece5wise continuous algoritm, (y

manipulating two seven5segments to get an accurate

!isplay of te alpa(et we want to !isplay' econ!ly,

we wrote co!es in assem(ly language via notepa!,

wic must (e save! as 'asm file' %e save! file was

(uilt wit an assem(ler "9IDI 5 :1# wic generate!

tree files; e. file, o(< file an! list file' %e e. file

was use! for te simulation of te !esign in roteus

/'/ =9 professional an! (urning of te

microcontroller for construction' %ir!ly te

programme! microcontroller wit oter components

were use! to acieve pysical !esign of te researc

wic is functional'

IV RELATED LITERAT;RE

even5segment !isplays are ma!e wit 0ED>s' tey

are arrange! in a pattern tat represents te num(er

?@> "see figure 1 a(ove#' Num(ers like 5B can (e!isplaye! an! some of te alpa(ets tat can (e

possi(le in seven5segment (y turning !ifferent 0ED>s

on or off' %e various segments may (e ligt up to

form te numeric !igits from to B' Displays wit

more segments yiel! a muc more realistic

alpa(et)@*' %e seven segment !isplay !oes not

allow true !escen!ers on letters suc as Cg8, C On On On +ff +ff +ff +ff 6 On On On On On On On

/ On On +ff +ff On On On


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control te !isplay' o we ave wire! te pins tat

control tem to F:v or groun! were appropriate'

ince tere are seven5segments, one woul! assume

tat you woul! nee! seven outputs from te I to

!isplay one !igit' Gere we are using a cip tat will

take four (it an! convert it to te /5(it output for te

seven5segment !isplay'

IV Seven segment '%nne'ti%ns

%ere are two important ways of seven5segment

!isplay connection'

ommon Ano!e Display "F#

ommon ato!e Display "5#

In common Ano!e !isplay, te ano!e of all te

0ED>s on te segment are collecte! an!


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system proteus =9 professional version /'/ as

sown in fig' 4

Fig @ sim+!"ted design %( t)e s#stem in s)eet 8

"nd s)eet

$rom te simulate! !esign te construction of te

pysical system starte! wic is ma!e up of many

electronic an! electrical components' %is system

make use! of piece5wise continuous algoritm in

wic two seven5segments are manipulate! to form

145segments wic can !isplay e.tra caracters in

6ppercase' %e piece5 wise continuous algoritm is

fully !emonstrate! (elow;

A0+I%G9 %+ DI0A7 CFAC;LTY OF

SCIENCE8 using seven5segment !isplay

a, (, c, !, e, f, g, as oolean varia(les

+n L1

+ff L

I$ Ca8 is on !isplay C18

Else !isplay C8

%o !isplay ?$>

A, , , D, E, $, ,

Ken AL1

L

L

DL

EL1

$L1

L1

?$>L 1111

%o !isplay ?A>

Ken AL1

L1

L1

DL

EL1

$L1

L1

?A>L 111111

%o !isplay ?>

Ken AL1

L

L

DL1

EL1

$L1

L

?>L 1111

%o !isplay ?6>

Ken AL

L1

4

F A C U L T Y O F

9icrocontroller

C I E N C ES

0

1

011

01

2

0

1

0

20

3

0

40:

0

H

0

/

0

@

0

B

01

301

4

01

:

01

H

a

(

c

!

e

f

g

A

D

E

$


5/8

L1

DL1

EL1

$L1

L

?6>L 11111

%o !isplay ?0>

Ken AL

L

L

DL1

EL1

$L1

L

?0>L 111

%o !isplay ?%> "tis is were piece5wise continuous

algoritm is applie! to acieve C%8 in upper case#'

$or egment "1# $or egment "2#

Ken AL1, wen

AL1

L1

L

L1

L

DL

DL

EL

EL1

$L

$L1

L

L

egment 1 F segment 2 L $ L 111111

%o !isplay ?7>

Ken AL

L1

L1

DL

EL

$L1

L1

?7>L 1111

%o !isplay ?+>

Ken AL1

L1

L1

DL1

EL1

$L1

L

?+>L 111111

%o !isplay ?>

Ken AL1L

L1

DL1

EL

$L1

L1

?>L 11111

%o !isplay ?I>

Ken AL

L

L

DL

EL1

$L1

L

?I>L 11

%o !isplay ?N>

Ken AL1

L1

L1

DL

EL1

:


6/8

$L1

L

?N>L 11111

%o !isplay ?E>

Ken AL1

L

L

DL1

EL1

$L1

L1

?E>L 11111

Display C$A60%7 +$ IENE8

VI DESIGN AND IMPLEMENTATION

As menti%ned "*%ve all te electrical an! electroniccomponents were connecte! an! sol!ere! togeter (y

us, several testing an! corrections were !one on te

system to (ring out a functional system' %e overall

!esign flow was summari-e! in fig' :'to power on

tis !isplay system , an alternating current "A# of

22v enters te transformer from te step5!own

point, te step5!own re!uces te current from 22v to

1@ to 12v nee!e! to !isplay eac segment after

passing troug resistors of "1w 5/oms# an!

capacitors wic elps to control te flow of ig

voltage from te segments in or!er not to cause

!amage to te 0EDs insi!e te segment, an! also

stores electrical carges respectively' %o !isplay any

particular segment of eac !igit, te controlling

integrate! circuit will turn on te cato!e !river for

te selecte! !igit an! te ano!e !river for te selecte!

!igit too; wit te elp of te clock cycle on te

circuit, it pro!uces a sort (linking interval wic

will elp a new segment to ligt'

VI 8 Det"i!ed im!ement"ti%n !"ns

%ese are te various steps for te implantation of

tis seven5segment !isplay system'

tep 1

imulation of te !isplay system in proteus =9

professional /'/

Fig design (!%3

Ste

B+&ning %( t)e '%mi!ed '%des int%

mi'&%'%nt&%!!e& AT6/C78 3it) " 3en%n

&%g&"mme&

Ste

H

=ero5

(oar!

ystem !esign

ircuit !iagram

egments

ol!ering

esistors

ol!ering

%ransistor

ol!ering

ower!io!e

tart

ol!ering

onnecting

ca(les

%esting

ackaging

top


7/8

C%nst&+'ti%n %( t)e '%nt&%! +nit 3it) t)e

mi'&%'%nt&%!!e& 3it) %t)e& '%m%nents

Fig ste di"g&"m

Ste @

C%nst&+'ti%n %( dis!"# +nit 3it) t)e ie'e 3ise

'%ntin+%+s "!g%&it)m

Fig > t)e ie'e 3ise '%ntin+%+s "!g%&it)m

Fig 6 t)e dis!"# +nit

Ste 7

T)e '%m*in"ti%n %( t)e '%nt&%! +nit "nd t)e

dis!"# +nit t% "')ieve " (+n'ti%n"! s#stem

Fig / ste 7 di"g&"m

Ste

P"'1"ging %( t)e 3%&1ing s#stem

VII RES;LT

%is main aim of tis researc is to sow ow

seven5segment can (e manipulate! to !isplay all

letters (ot upper an! lower case' %is was acieve!

an! it was very interesting troug te use of piece5

wise continuous algoritm tere(y creating room for

manipulation of /5segments to form 145segments, B5

segment an! 1H5 segment' As researcers, we

(elieve tat tere is always a room for more

improvement on tis researc work' %is pro


8/8

)H* 9antega--a,' eal %ime Application Interface

"%AI# in low cost ig performance

motion control, 9otion ontrol 23, a

conference of ANI0A, Associa-ione

Na-ionale Italiana per l>Automa-ione

"National Italian Association for

Automation#, 9ilano, Italy' etrieve! on

9arc 2/, 21, 23 Q'

)/* icar!, Alpa Arcitecture, Digital %ecnology

finished an approach to designing seven segment static displ

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