temperature control system project report.doc

8/17/2019 Temperature Control System Project Report.doc

http://slidepdf.com/reader/full/temperature-control-system-project-reportdoc 1/49

GANPAT UNIVERSITYGANPAT UNIVERSITY

PROJECT REPORTPROJECT REPORT

ONON

TEMPRATURETEMPRATURE CONTROLLER ANDCONTROLLER ANDDISPLAY DISPLAY

PREPARED BY:PREPARED BY: GUIDED BY:GUIDED BY:

PATEL DHIREN (PATEL DHIREN (086440311526)) MR. H.H.AGRAWAL MR. H.H.AGRAWAL

PATEL JAY (PATEL JAY (086440311528))

PATEL PIYUSH (PATEL PIYUSH (086440311536))



Certifcate This is certifed that

1. Patel Dhiren Bharatbhai

2. Patel Jay Sureshbhai

3. Patel Piyush Dashrathbhai

O diplomain Electronics and Communication Engineering (6th

semester) o the academic year Dec-200 assatisactory completed their term !or" in pro#ect on TEMPRATURE CONTROLLER AND DISPLAY

They !or"ed !ith ull interest and here !ithsu$mit their report in partial ulfllment o the Diplomain Electronics % Communication Engineering&

Date of submission:

Sign of Guie:!ea of e"a#tment



$e %ou& &i'e to t(an' #es"e)te ignita#iesfo# t(ei# *a&uab&e Coo"e#ation+ T(e, (a*e (e&"e us in)om"&eting t(e "#o-e)t %o#' satisfa)to#, an su))essfu&&,

$e a#e #ea&&, *e#, t(an'fu& to ou# !ea of

t(e e"a#tment M#+.+S+Pate& fo# gi*ing us t(e o""o#tunit,to ta'e t(is "#o-e)t %o#' on /TEMPRATURE CONTROLLERAND DISPLAY an en)ou#aging us in )om"&eting t(e"#o-e)t %o#' su))essfu&&,+

$e a#e *e#, t(an'fu& to ou# guie0 M#+!+!+Ag#a%a& fo# "#o*iing us (is *a&uab&e guian)e ine*e#, as"e)ts )on)e#ne %it( ou# "#o-e)t+ !is %i&&ingnessan ee" 'no%&ege (a*e a&%a,s (e&"e us in )on)ei*ing

ne% ieas+ $e %ou& a&so &i'e to t(an' (im fo# (is )oo"e#ation !e (as a&%a,s 1uiet&, an g&a&, ans%e#e a&&ou# 1ue#ies #ega#ing to t(is "#o-e)t+

$e a#e a&so t(an'fu& to ou# &ab assistantM#+S(ai&es(b(ai as %e&& to "#o*ie us ne)essa#,&abo#ato#, e*i)es in %o#'ing o# #unning )onitions+

WITH HEARTFULL OF GRATITUDE



“E2PERIENCE IS T!E .EST TEAC!ER”. Thissaying as !aye" a g#i"ing r$!e in inc!#"ing in%$r&ati$n as aart $% the c#rric#!#& $% the ELECTRONICS ANDCOMMUNICATION r$gra&&e $% the GANPAT UNI3ERSITY+

This ractica! training 'ase" $n ELECTRONICSAND COMMUNICATION r$gra&&e". De(e!$e" %ee!ing

a'$#t the "i)c#!ties cha!!enges in the engineering *$r". On!ythe$retica! +n$*!e"ge "$es n$t i&art c$&!ete e"#cati$nara!!e! e,erience &#st acc$&any the$retica! +n$*!e"gea"&iring e"#cati$n.

In this "irecti$n *e ha(e try t$ $#r !e(e! 'est t$

resent a r$-ect re$rt $n “TEMPRATURE CONTROLLER AND

DISPLAY”.



4+ Int#ou)tion

5+ Ci#)uit Diag#am

6+ Ci#)uit Des)#i"tion

7+ Com"onent List

8+ Data s(eets

9+ Refe#en)e



A si&!e intr$"#cti$n a'$#t the te&erat#re c$ntr$!!ercirc#it.

This circ#it r$-ect is &ain!y #se" #se" %$r te&erat#rein"icat$r te&erat#re c$ntr$!!er

An" in c$ntr$!!ing "e(ice "een" $n te&erat#re.

C$ntr$!!ing "e(ices !i+e air heater %act$ry in"#stria!

a!icati$n.

In te&erat#re c$ntr$!!er circ#it there are t*$ art c$nsist$%

o ADC /0/1 inter%ace *ith at02s34.o LCD inter%ace *ith at02s34.

The har"*are circ#it $% te&erat#re c$ntr$!!er *ithc$ntr$!!er t$ nee" the r$gra&&ing.

There are t*$ $ssi'i!ities 5SO r$gra&&ing asse&'!y !ang#age r$gra&&ing c !ang#age

6ere *e #se the asse&'!y !ang#age r$gra&&ing #sing+ei! 789isi$n1 IDE: s$%t*are.

This r$gra&&ing #s#a!!y !$a" in the at02s34 c$ntr$!!eric.

At02s34 is a %a&i!y $% 0/3;.

The r$gra&&ing %$r 0/3;.this syste& is ca!!e"e&'e""e" syste&.

The &ain rinci!e $% this r$-ect t$ in"icate te&erat#reana!$g t$ "igita! t$ c$ntr$! the te&erat#re < inter%acing.



$o#'ing :$o#'ing :

6$* t$ inter%ace ADC/0/1 #sing 0/3; &icr$c$ntr$!!er7AT02C34:

ADC/0/1 is $ne $% the &$st c$&&$n!y #se" ana!$g t$"igita! c$n(erter IC. In &any a!icati$ns it is re=#ire"t$ c$n(ert the $#t#t $% the sens$r *hich is ana!$g#ein nat#re t$ a "igita! %$r&. The "ata in "igita! %$r&atcan then 'e #ti!i>e" %$r %#rther r$cessing 'y the "igita!r$cess$rs. Tyica! a!icati$ns inc!#"e s$#n"r$cessing te&erat#re r$cessing etc. This circ#it"e&$nstrates the rinci!e an" $erati$n $% inter%acinga si&!e ADC /0/1 #sing 0/3; &icr$c$ntr$!!er

7AT02C34:. ADC/0/1 is c$nnecte" as sh$*n in the circ#it "iagra&.

6ere the in#t is ta+en %r$& a reset *hich gi(es"i?erent ana!$g signa!s t$ the ADC. The $#t#t ins $%the ADC are c$nnecte" t$ LEDs. The c$ntr$! ins $% theADC are c$nnecte" t$ the &icr$c$ntr$!!er AT02C34.

ADC/0/1 is a sing!e channe! ana!$g t$ "igita! c$n(ert$ri.e. it can ta+e $n!y $ne ana!$g signa!. An ADC has n 'itres$!#ti$n 7'inary %$r&: *here n can 'e 0;/;4;@ $r

e(en 41 'its. ADC /0/1 has 0 'it res$!#ti$n. The higherres$!#ti$n ADC gi(es s&a!!er ste si>e. Ste si>e iss&a!!est change that can 'e &eas#re" 'y an ADC. 5$ran ADC *ith res$!#ti$n $% 0 'its the ste si>e is;2.3&9 739B433:.

The ti&e ta+en 'y the ADC t$ c$n(ert ana!$g "ata int$"igita! %$r& is "een"ent $n the %re=#ency $% c!$c+s$#rce. ADC/0/1 can 'e gi(en c!$c+ %r$& e,terna!s$#rce. It a!s$ has an interna! c!$c+.

6$*e(er the c$n(ersi$n ti&e cann$t 'e &$rethan;;/#s. T$ #se the interna! c!$c+ a caacit$r an"resist$r is c$nnecte" t$ in ;2 an" 1 as sh$*n in thecirc#it "iagra&. The %re=#ency is gi(en 'y the re!ati$n% ;B 7;.;RC:. The circ#it #ses a resistance $% ;/+ an" acaacit$r $% ;3/5 t$ generate c!$c+ %$r ADC/0/1. 9in*hich is the in#t in is c$nnecte" t$ a reset t$r$(i"e ana!$g in#t.

Pin Descriti$n

http://engineersgarage.com/content/ic-adc0804


http://engineersgarage.com/content/led

http://engineersgarage.com/content/microcontroller-at89c51



http://engineersgarage.com/content/led

http://engineersgarage.com/content/microcontroller-at89c51



;. CS Chi Se!ect This is an acti(e !$* in an" #se"

t$ acti(ate the ADC/0/1.

4. RD Rea" This is an in#t in an" acti(e !$*. A%terc$n(erting the ana!$g "ata the ADC st$res the res#!tin an interna! register. This in is #se" t$ get the "ata$#t $% the ADC /0/1 chi. hen CS/ < high t$ !$*#!se is gi(en t$ this in the "igita! $#t#t is sh$*n$n the ins D/FDG.

. R rite This is an in#t in an" acti(e !$*. Thisis #se" t$ instr#ct the ADC t$ start the c$n(ersi$nr$cess. I% CS/ an" R &a+es a !$* t$ hightransiti$n the ADC starts the c$n(ersi$n r$cess.

1. CLH IN C!$c+ IN This is an in#t in c$nnecte" t$an e,terna! c!$c+ s$#rce.

3. INTR Interr#t This is an acti(e !$* $#t#t in. This in g$es !$* *hen the c$n(ersi$n is $(er.

@. 9in Ana!$g In#t .

G. 9inF Ana!$g In#t. C$nnecte" t$ gr$#n".

0. AJND Ana!$g Jr$#n".

2. 9re%B4 This in is #se" t$ set the re%erence($!tage. I% this is n$t c$nnecte" the "e%a#!t re%erence

($!tage is 39. In s$&e a!icati$n it is re=#ire" t$ re"#cethe ste si>e. This can 'e "$ne 'y #sing this in.

;/. DJND Digita! Jr$#n".

;;F;0. O#t#t Data Kits 7DGFD/:.

;2. CLHR C!$c+ Reset.

4/. 9cc P$siti(e S#!y



Cont#o&&ing fun)tions :

http://2.bp.blogspot.com/_76n3lmgHtmM/TSbrH36Vw8I/AAAAAAAAAFw/ewCOtap6GIE/s1600/ab.bmp



The !c" "is!ay t*$ te&erat#re ;:c#rrent te&erat#re 4:set $int te&erat#re

The set $int incre&ent < "ecre&ent #sing s*itch.

hen *e set the s7 set $int : !ess than the c#rrentte&erat#re then trigger the #!se t$ 'ase $% transist$r'y c$ntr$!!er.

The c$!!ect$r c#rrent $* in c$i!. s$ the LED *i!! 'e ON.

In ON c$n"iti$n $% re!ay the c$&&$n ter&ina! is

c$nnecte" *ith NO $% re!ay.

5ina!!y the '#>>er *i!! 'e ON.

hen s is &$re than c#rrent te&erat#re. in thisc$n"iti$n !e" < re!ay < '#>>er *i!! 'e $?.

s%r P//,0/ s%r P;/,0/ s%r P;/,2/ s%r P4/,A/



s%r P/,K/

s'it re!ay P;/ S'it inc P;; s'it "ec P;4

"efne a"c"ata P

s'it intr P44 BB3s'it r" P4/ BB4s'it *r P4; BB

s'it rs P43s'it r* P4@s'it en P4G#nsigne" char !ine1Q /,0//,C//,2//,D/"efne DKUS P/"efne KLINHLCD /,/2"efne ONCURSOR /,/A"efne ONLCD /,/C"efne CLEARLCD /,/;"efne 6OMELCD /,/4

"efne ENTRYMODE /,/@"efne 5UNCSET /,0($i" *r!c"c&"7#nsigne" char c&" :($i" *r!c""ata7#nsigne" char Data :($i" "e!ay7#nsigne" int c$#nt:($i" *r&sg7char LineN$char en"!$c #nsigne" char &sgQ:($i" get"ata7:

static #nsigne" char s/

c$"e #nsigne" char scr34Q ;@Q Te& SP

c$"e #nsigne" char scr;4Q ;@Q VAY Pate! KSPP 4n" S6I5T ($i" &ain7:

#nsigne" char i#nsigne" char ,";"4"(a!a/

P/,?P//,//



P4/,/%re!ay/

*r!c"c&"75UNCSET: BBset "ata !engthn$ $%"is4F!ine "is!ay

*r!c"c&"7ONLCD: BB"is!ay an" c#rs$r $n*r!c"c&"7ENTRYMODE:BBinc. DDra& a""ress*r!c"c&"7CLEARLCD: BBC!ear "is!ay

%$r7i/iW4i:"e!ay7;//:*r&sg7!ineiQ;@scr;iQ:

%$r7i/iW;3i:"e!ay73////:

%$r7i/iW4i:"e!ay7;//:

*r&sg7!ineiQ;@scr3iQ:

*hi!e7;: *r/ "e!ay7;//: *r; *hi!e7intr X ;: *hi!e7intr X /:

r"/ "e!ay7;/: (a!a"c"ata r";

*r!c"c&"7!ine/Q2:

,(a!B;/";(a!;/"4,;/",B;/



*r!c""ata7"/,/:"e!ay7;/:*r!c""ata7"4/,/:

*r!c""ata7";/,/:"e!ay7;/:

a7"Z;//:7"4Z;/:";

*r!c""ata7[C[:

*r!c"c&"7!ine;Q2:*r!c""ata77sB;/:/,/:*r!c""ata77s;/:/,/:

i%7inc/:*hi!e7inc/:si%7 7"ec/: << s\/ :

*hi!e7"ec/:sFF

i%7a\s:re!ay;e!sere!ay/"e!ay743///:

($i" *r!c"c&"7#nsigne" char c&" :

DKUS c&""e!ay7;/:rs / BBse!ect c&" reg



"e!ay7;/:r* / BB*rite &$"e"e!ay7;/:en ;"e!ay7//:en /"e!ay74/:

($i" *r!c""ata7#nsigne" char Data :

DKUS Data"e!ay7;/:rs ; BBse!ect "ata reg"e!ay7;/:r* /"e!ay7;/:en ;"e!ay7//:en /"e!ay7;/:rs /"e!ay74/:

($i" *r&sg7char LineN$char en"!$c #nsigne" char &sgQ:

#nsigne" char i*r!c"c&"7LineN$:%$r7i /iWen"!$ci:

*r!c""ata7&sgiQ:"e!ay73/:

($i" "e!ay7#nsigne" int "!y:*hi!e7"!y\/:"!yFF



4+ Resisto#; 4'0 4<'0 =+5'0 4<' "ot

5+ Ca"a)ito# 488"f0 66"f0 4<uf

6+ DC "o%e# su""&,

7+ LED

8+ S%it)(

9+ T#ansisto#

>+ .u??e#

=+ Re&a,

@+ C#,sta&

4<+ AT=@S85

44+ ADC <=<7

45+ >=<8

46+Senso# LM 68

47+ Dis"&a,

48+ So)'et



RESISTOR:

A,ia!F !ea" resist$rs $n tae. Thetae is re&$(e" "#ring asse&'!y

'e%$re the !ea"s are %$r&e" an"the art is inserte" int$ the '$ar".

Three car'$n c$&$siti$n resist$rsin a ;2@/s (a!(e 7(ac##& t#'e:ra"i$. A resist$r is a t*$Fter&ina!e!ectr$nic c$&$nent thatr$"#ces a ($!tage acr$ss itster&ina!s that is r$$rti$na! t$ thee!ectric c#rrent thr$#gh it in

acc$r"ance *ith Oh&[s !a*

3 IRResist$rs are e!e&ents $% e!ectrica!net*$r+s an" e!ectr$nic circ#its



an" are #'i=#it$#s in &$st e!ectr$nic e=#i&ent. Practica!resist$rs can 'e &a"e $% (ari$#s c$&$#n"s an" f!&s as *e!!as resistance *ire 7*ire &a"e $% a highFresisti(ity a!!$y s#ch asnic+e!Bchr$&e:.

The ri&ary characteristics $% a resist$r are the resistance thet$!erance &a,i&#& *$r+ing ($!tage an" the $*er rating.Other characteristics inc!#"e te&erat#re c$e)cient n$isean" in"#ctance. Less *e!!F+n$*n is critica! resistance the (a!#e'e!$* *hich $*er "issiati$n !i&its the &a,i&#& er&itte"c#rrent $* an" a'$(e *hich the !i&it is a!ie" ($!tage.Critica! resistance "een"s #$n the &ateria!s c$nstit#ting theresist$r as *e!! as its hysica! "i&ensi$ns it[s "eter&ine" 'y"esign. Resist$rs can 'e integrate" int$ hy'ri" an" rinte"circ#its as *e!! as integrate" circ#its. Si>e an" $siti$n $%!ea"s 7$r ter&ina!s: are re!e(ant t$ e=#i&ent "esignersresist$rs &#st 'e hysica!!y !arge en$#gh n$t t$ $(erheat *hen"issiating their $*er.

Resisto# Co&o# Coing



4<' 3a#iab&eResisto#:

9aria'!e resist$rs c$nsist $% a resistance trac+ *ithc$nnecti$ns at '$th en"s an" a *ier *hich &$(es a!$ng thetrac+ as y$# t#rn the sin"!e. The trac+ &ay 'e &a"e %r$&car'$n cer&ets 7cera&ic an" &eta! &i,t#re: $r a c$i! $% *ire7%$r !$* resistances:. The trac+ is #s#a!!y r$tary '#t straighttrac+ (ersi$ns #s#a!!y ca!!e" s!i"ers are a!s$ a(ai!a'!e.

9aria'!e resist$rs &ay 'e #se" as a rhe$stat *ith t*$c$nnecti$ns 7the *ier an" -#st $ne en" $% the trac+: $r as a$tenti$&eter *ith a!! three c$nnecti$ns in #se. Miniat#re

(ersi$ns ca!!e" resets are &a"e %$r setting # circ#its *hich*i!! n$t re=#ire %#rther a"-#st&ent.9aria'!e resist$rs are $%ten ca!!e" $tenti$&eters in

'$$+s an" cata!$g#es. They are secife" 'y their &a,i&#&resistance !inear $r !$garith&ic trac+ an" their hysica! si>e



CAPACITORF

Electronic symbol:-

Type: - Passive A caacit$r $r c$n"enser is a assi(e e!ectr$nic

c$&$nent c$nsisting $% a air $% c$n"#ct$rs searate" 'y a"ie!ectric. hen a ($!tage $tentia! "i?erence e,ists 'et*eenthe c$n"#ct$rs an e!ectric fe!" is resent in the "ie!ectric. Thisfe!" st$res energy an" r$"#ces a &echanica! %$rce 'et*eenthe !ates. The e?ect is greatest 'et*een *i"e at ara!!e!narr$*!y searate" c$n"#ct$rs.

The c$n"#ct$rs an" !ea"s intr$"#ce an e=#i(a!entseries resistance an" the "ie!ectric has an e!ectric fe!" strength!i&it res#!ting in a 'rea+"$*n ($!tage.Caacit$rs are *i"e!y #se" in e!ectr$nic circ#its t$ '!$c+ the$* $% "irect c#rrent *hi!e a!!$*ing a!ternating c#rrent t$ asst$ f!ter $#t inter%erence t$ s&$$th the $#t#t $% $*ers#!ies an" %$r &any $ther #r$ses. They are #se" inres$nant circ#its in ra"i$ %re=#ency e=#i&ent t$ se!ectartic#!ar %re=#encies %r$& a signa! *ith &any %re=#encies.

Ce#ami) Ca"a)ito#:Cera&ic caacit$rs are c$nstr#cte" *ith &ateria!s s#ch astitani#& aci" 'ari#& #se" as the "ie!ectric. They can 'e #se"in high %re=#ency a!icati$ns. Tyica!!y they are #se" incirc#its *hich 'yass high %re=#ency signa!s t$ gr$#n".

These caacit$rs ha(e the shae $% a "is+. Their caacitance isc$&arati(e!y s&a!!.

The caacit$r $n the !e%t is a ;//5 caacit$r *ith a "ia&eter$% a'$#t &&.The caacit$r $n the right si"e is rinte" *ith

;/ s$ ;/ , ;/

5 'ec$&es /./; 85. The "ia&eter $% the "is+ isa'$#t @ &&.Cera&ic caacit$rs ha(e n$ $!arity Cera&ic caacit$rs sh$#!"n$t 'e #se" %$r ana!$g circ#its Keca#se "ist$rt the signa!.


http://slidepdf.com/reader/full/temperature-control-system-project-reportdoc 25/49RELAY:



A re!ay is an e!ectrica! s*itch that $ens an" c!$ses

#n"er the c$ntr$! $% an$ther e!ectrica! circ#it. In the $rigina!

%$r& the s*itch is $erate" 'y an e!ectr$&agnet t$ $en $r

c!$se $ne $r &any sets $% c$ntacts. It *as in(ente" 'y V$seh

6enry in ;03. Keca#se a re!ay is a'!e t$ c$ntr$! an $#t#t

circ#it $% higher $*er than the in#t circ#it it can 'e

c$nsi"ere"

t$ 'e in a 'r$a" sense a %$r& $% an e!ectrica! a&!i%ier.

Fig . 4 .26 Suga r cube relay

Desite the see" $% techn$!$gica! "e(e!$&ents

s$&e r$"#cts r$(e s$ $#!ar that their +ey ara&eters

an" "esign %eat#res re&ain (irt#a!!y #nchange" %$r years.

One s#ch r$"#ct is the ]s#gar c#'e^ re!ay sh$*n in the

fg#re a'$(e *hich has r$(e" #se%#! t$ &any "esigners

*h$ nee"e" t$ s*itch # t$ ;/A *hi!st #sing re!ati(e!y !itt!e

PCK area

Since re!ays are s*itches the ter&in$!$gy a!ie" t$

s*itches is a!s$ a!ie" t$ re!ays. A re!ay *i!! s*itch $ne $r

&$re $!es each $% *h$se c$ntacts can 'e thr$*n 'y

energi>ing the c$i! in $ne $% three *ays

4 No#ma&&, o"en NO c$ntacts c$nnect the circ#it *hen



the re!ay is acti(ate " the circ#it is "isc$nnecte" *hen the

re!ay is inacti(e. It is a!s$ ca!!e" a 5ORM A c$ntact $r

“&a+e” c$ntact.

4.N o #ma&&, ) &o s e N C c$ntacts "isc$nnect the circ#it

*hen the re!ay is acti(ate" the circ#it is c$nnecte" *hen

re!ay is inacti(e. It is a!s$ ca!!e" 5ORM K c$ntact $r”

'rea+” c$ntact

.C(a n g e o *e# o# ou b &e t( # o% c$ntacts c$ntr$! t*$

circ#its $ne n$r&a!!y $en c$ntact an" $ne n$r&a!!y _c!$se" c$ntact *ith a c$&&$n ter&ina!. It is a!s$ ca!!e" a

5$r& C “trans%er “c$ntact.

"C" denotes the common terminal in SPDT and DPDT types

E SPST S in g &e P o&e S in g &e T (# o %: These ha(e t*$

ter&ina!s *hich can 'e c$nnecte" $r "isc$nnecte".

Inc!#"ing t*$ %$r the c$i! s#ch a re!ay has %$#r

ter&ina!s in t$ta!. It is a&'ig#$#s *hether the $!e is

n$r&a!!y $en $r n$r&a!!y c!$se". The ter&in$!$gy

SPNO an" SPNC is s$&eti&es #se" t$ res$!(e the

a&'ig#ity.



E SPDT S in g &e P o&e D ou b &e T (# o %: A c$&&$n

ter&ina! c$nnects t$ either $% t*$ $thers. Inc!#"ing

t*$ %$r the c$i! s#ch a re!ay has f(e ter&ina!s in

t$ta!.

E DPST D ou b &e P o&e S in g &e T (# o %: These ha(e t*$

airs $% ter&ina!s. E=#i(a!ent t$ t*$ SPST s*itches $r

re!ays act#ate" 'y a sing!e c$i!. Inc!#"ing t*$ %$r the

c$i! s#ch a re!ay has si, ter&ina!s in t$ta!. It is

a&'ig#$#s *hether the $!es are n$r&a!!y $en

n$r&a!!y c!$se" $r $ne $% each.

E DP D T D ou b &e P o&e D ou b &e T (#o%: These ha(e t*$r$*s $% changeF$(er ter&ina!s.

E=#i(a!ent t$ t*$ SPDT s*itches $r re!ays act#ate" 'y a

sing!e c$i!. S#ch a re!ay has eight ter&ina!s inc!#"ing

the c$i!.

E FPDT F ua# u" &e P o & e D o ub&e T ( # o%: O%ten

re%erre" t$ as `#a" P$!e D$#'!e Thr$* $r 1PDT. These

ha(e %$#r r$*s $% changeF$(er ter&ina!s. E=#i(a!ent t$

%$#r SPDT s*itches $r re!ays act#ate" 'y a sing!e c$i!

$r t*$ DPDT re!ays. In t$ta! %$#rteen ter&ina!s

inc!#"ing the c$i!.



AT89S52 :-


http://slidepdf.com/reader/full/temperature-control-system-project-reportdoc 35/49SENSORLM68:



IC>=<8:



LCD:



LIFU ID CRY S TAL DIS P LAY

A !i=#i" crysta! "is!ay 7LCD: is a thin %!at "is!ay "e(ice

&a"e # $% any n#&'er $% c$!$r $r &$n$chr$&e i,e!s

arraye" in %r$nt $% a !ight s$#rce $r re%!ect$r. Each i,e!

c$nsists $% a c$!#&n $% !i=#i" crysta! &$!ec#!es s#sen"e"

'et*een t*$ transarent e!ectr$"es an" t*$ $!ari>ing

f!ters the a,es $% $!arity $% *hich are eren"ic#!ar t$

each $ther. Eith$#t the !i=#i" crysta!s 'et*een the& !ight

assing thr$#gh $ne *$#!" 'e '!$c+e" 'y the $ther. The

!i=#i" crysta! t*ists the $!ari>ati$n $% !ight entering $ne %i!ter

t$ a!!$* it t$ ass thr$#gh the $ther.

Many &icr$c$ntr$!!er "e(ices #se [s&art LCD[ "is!ays t$

$#t#t (is#a! in%$r&ati$n. LCD "is!ays "esigne" ar$#n"

6itachi[s LCD 6D11G0/ &$"#!e are ine,ensi(e easy t$

#se an" it is e(en $ssi'!e t$ r$"#ce a rea"$#t #sing the

0,0/ i,e!s $% the "is!ay. They ha(e a stan"ar" ASCII set $%

characters an" &athe&atica! sy&'$!s.

5$r an 0F'it "ata '#s the "is!ay re=#ires a 39 s#!y

!#s ;; IBO !ines. 5$r a 1F'it "ata '#s it $n!y re=#ires the

s#!y !ines !#s se(en e,tra !ines. hen the LCD "is!ay is

n$t ena'!e" "ata !ines are triFstate an" they "$ n$t inter%ere

*ith the $erati$n $% the &icr$c$ntr$!!er.

Data can 'e !ace" at any !$cati$n $n the LCD. 5$r ;@4LCD the a""ress !$cati$ns

are

Bi#st &ine =< =4 =5 =6 =7 =8 =9 t(#oug(=B

Se)on &ine C< C4 C5 C6 C7 C8 C9

t(#oug( CB

SIGNALS TO T!E LCD



The LCD a!s$ re=#ires c$ntr$! !ines %r$& the&icr$c$ntr$!!er

4 E n a b &e E

This !ine a!!$*s access t$ the "is!ay thr$#gh RBan" RS !ines. hen this !ine is !$* the LCD is "isa'!e"

an" ign$res signa!s %r$& RB an" RS. hen 7E: !ine is

high the LCD chec+s the state $% the t*$ c$ntr$! !ines

an" res$n"s acc$r"ing!y.

5 Rea$#ite R G$

This !ine "eter&ines the "irecti$n $% "ata 'et*eenthe LCD an" &icr$c$ntr$!!er.

hen it is !$* "ata is *ritten t$ the LCD. hen it is high"ata is rea" %r$& the

LCD.

6 R e gi ste# s e &e )t R S

ith the he! $% this !ine the LCD interrets the tye $%

"ata $n "ata !ines. hen it is !$* an instr#cti$n is 'eing

*ritten t$ the LCD. hen it is high a character is 'eing

*ritten t$ the LCD.

Logi) s t atus on ) o n t # o & &ines:

b E F / Access t$ LCD

"isa'!e"

F ; Access t$ LCD ena'!e"

b RB F / riting "atat$ LCD

F ; Rea"ing "ata%r$& LCD

b RS F / Instr#cti$n

F ;Characte

r



$ # i t i n g a n # e a ing t(e a t a f # om t(eL C D:

riting "ata t$ the LCD is "$ne in se(era! stes

;: Set RB 'it t$ !$*4: Set RS 'it t$ !$gic / $r ; 7instr#cti$n $r character:

: Set "ata t$ "ata !ines 7i% it is *riting:

1: Set E !ine t$ high

3: Set E !ine t$ !$*

Rea" "ata %r$& "ata !ines 7i% it is rea"ing:

;: Set RB 'it t$ high

4: Set RS 'it t$ !$gic / $r ; 7instr#cti$n $r character:

: Set "ata t$ "ata !ines 7i% it is *riting:

1: Set E !ine t$ high

3: Set E !ine t$ !$*

P IN D E S C RI P T ION

M$st LCDs *ith ; c$ntr$!!er has ;1 Pins an" LCDs *ith 4c$ntr$!!er has ;@ Pins

7t*$ ins are e,tra in '$th %$r 'ac+F!ight LED c$nnecti$ns:.



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