Desig
oftheTemperatureCo
trolSystemBasedo
AT89C51
ABSTRACT
Thepri
ciplea
dfu
ctio
softhetemperatureco
trolsystembasedo
microco
trollerAT89C51arestudieda
dthetemperaturemeasureme
tu
itco
sistsofthe1Wirebusdigitaltemperaturese
sorDS18B20Thesystemca
beexpectedtodetectthepresettemperaturedisplaytimea
dsavemo
itori
gdataA
alarmwillbegive
bysystemifthetemperatureexceedstheuppera
dlowerlimitvalueofthetemperaturewhichca
besetdiscretio
arilya
dthe
automaticco
trolisachievedthusthetemperatureisachievedmo
itori
gi
tellige
tlywithi
acertai
ra
geBasi
go
pri
cipleofthesystemitiseasytomakeavarietyofother
o
li
earco
trolsystemssolo
gasthesoftwaredesig
isreaso
ablycha
gedThesystemhasbee
provedtobeaccuratereliablea
dsatisfiedthroughfieldpractice
KEYWORDSAT89C51microco
trollerDS18B20temperature
1INTRODUCTION
Temperatureisaveryimporta
tparameteri
huma
lifeI
themoder
societytemperatureco
trolTCis
oto
lyusedi
i
dustrialproductio
butalsowidelyusedi
otherfieldsWiththeimproveme
tofthelifequalityweca
fi
dtheTCapplia
cei
hotelsfactoriesa
dhomeaswellA
dthetre
dthatTCwillbetterservethewholesocietysoitisofgreatsig
ifica
cetomeasurea
dco
trolthetemperatureBasedo
theAT89C51a
dtemperaturese
sorDS18B20thissystemco
trolstheco
ditio
temperaturei
tellige
tlyThetemperatureca
besetdiscretio
arilywithi
acertai
ra
geThesystemca
showthetimeo
LCDa
dsavemo
itori
gdataa
dautomaticallyco
trolthetemperaturewhe
theco
ditio
temperatureexceedstheuppera
dlowerlimitvalueBydoi
gsoitistokeepthetemperatureu
cha
gedThesystemisofhigha
tijammi
ghighco
trolprecisio
a
dflexibledesig
italsofitstheruggede
viro
me
tItismai
lyusedi
peopleslifetoimprovethequalityoftheworka
dlifeItisalsoversatilesothatitca
beco
ve
ie
ttoexte
dtheuseofthesystemSothedesig
isofprofou
dimporta
ceThege
eraldesig
hardwaredesig
a
dsoftwaredesig
ofthesystemarecovered
11I
troductio
The8bitAT89C51CHMOSmicroco
trollersaredesig
edtoha
dlehighspeedcalculatio
sa
dfasti
putoutputoperatio
sMCS51microco
trollersaretypically
fusedforhighspeedeve
tco
trolsystemsCommercialapplicatio
si
cludemodemsmotorco
trolsystemspri
tersphotocopiersairco
ditio
erco
trolsystemsdiskdrivesa
dmedicali
strume
tsTheautomotivei
dustryuseMCS51microco
trollersi
e
gi
eco
trolsystemsairbagssuspe
sio
systemsa
da
tilockbraki
gsystemsABSTheAT89C51isespeciallywellsuitedtoapplicatio
sthatbe
efitfromitsprocessi
gspeeda
de
ha
cedo
chipperipheralfu
ctio
ssetsuchasautomotivepowertrai
co
trolvehicledy
amicsuspe
sio
a
tilockbraki
ga
dstabilityco
trolapplicatio
sBecauseoftr