TELKOM
NIKA Indonesia
n
Journal of
Electrical En
gineering
Vol. 12, No. 8, August 201
4, pp. 6027 ~ 6035
DOI: 10.115
9
1
/telkomni
ka.
v
12i8.563
2
6027
Re
cei
v
ed
Jan
uary 15, 201
3
;
Revi
sed Ap
ril 7, 2014; Accepte
d
April 2
4
, 2014
Design of Temperature Measurement and Data
Acquisition System Based on
Virtual Instrument
LabVIEW
Xingju Wang
*, Zongjian Huang
Dep
a
rtment of Architectura
l Enviro
nment Eq
uipm
ent Eng
i
n
eeri
ng, Hen
an
Pol
y
t
e
ch
nic Ins
t
itute
Hen
an Na
n
y
a
n
g
, 4730
00, Ch
i
n
a
*Corres
p
o
ndi
n
g
author, e-ma
i
l
:
w
a
ng
xing
ju
e
du@
163.com
A
b
st
r
a
ct
T
he L
abVIEW
virtual
instru
ment co
nsists of
thre
e
parts: d
a
ta ac
quis
i
tio
n
, data
test a
nd
ana
lysis
,
output
disp
lay.
System c
ontro
l part is r
e
a
l
i
z
e
d
on t
he
LabVI
E
W
platfor
m
, d
a
ta col
l
ecti
on,
data pr
ocess
i
n
g
,
and
data r
e
cor
d
in
g, alar
m
an
d histor
ical
dat
a rea
dbac
k
fu
nction. T
he sy
stem us
es DS
l
8
B20 to
meas
ure
temp
eratur
e.
The p
aper
pres
ent des
ign
of
temper
ature measur
e
m
ent
a
n
d
data acq
u
isit
ion
syste
m
ba
sed
on virtua
l instr
u
ment La
bVIE
W
.
F
i
nally, thi
s
paper re
ali
z
es the tem
per
ature acq
u
isiti
on an
d detecti
on
system
, which is a new type of intelligent. System
ha
rdware circuit design is us
ing
digital tem
p
erature
sensor DS
18B
20, and
exper
i
m
e
n
ts show
that
the prop
ose
d
met
hod h
a
s
a goo
d effect.
Ke
y
w
ords
:
te
mp
eratur
e mea
s
ure
m
e
n
t, virtual in
stru
ment, data acq
u
is
itio
n, LabVIEW
Copy
right
©
2014 In
stitu
t
e o
f
Ad
van
ced
En
g
i
n
eerin
g and
Scien
ce. All
rig
h
t
s reser
ve
d
.
1. Introduc
tion
Virtual in
stru
ment is the
core
of compu
t
er
ha
rd
wa
re
platform, its
function
by the u
s
e
r
desi
gn and d
e
finition, which has a virtua
l panel, a co
mputer in
stru
ment syst
em
the test functi
on
is re
alized b
y
the test so
ftware. Th
e essen
c
e of
v
i
rtual in
strum
ent is to sim
u
late the con
t
rol
panel of tradit
i
onal in
strum
ents u
s
ing th
e displ
a
y
fun
c
tion of comp
uter mo
nitors, expressio
n
and
output results in
many fo
rms;
arithm
etic, si
gnal
an
alysis an
d p
r
oce
s
sing
the
data
usi
ng t
h
e
powerful
software fun
c
tion
in the comp
uter; co
mplet
ed the a
c
q
u
isition and
co
n
d
itioning
sig
n
a
ls
usin
g the I/O
interface e
qui
pment, to
co
mplete a
com
puter i
n
st
rum
ent sy
stem te
st fun
c
tion. Use
the mouse or
the keybo
a
rd
virtual panel
use
r
s,
like usi
ng a sp
eci
a
l measuri
ng in
strum
ent.
LabVIEW is a virtual instrum
ent developm
e
n
t pla
tform softwa
r
e, can su
pp
ort and
expre
ssi
on a
nalysi
s
functi
on equip
m
en
t source le
vel
with its intuitive and simpl
e
prog
ram
m
i
ng
style, many d
r
ivers, diverse,
created th
e ba
sis
of co
ndition
s for
u
s
ers to
quickl
y
build their
o
w
n
instru
ment sy
stem nee
ded
in pra
c
tical
e
ngine
erin
g [1]
.
The
LabVIE
W fun
c
tion
i
s
very p
o
werfu
l
.
Like
C an
d
C++
and
oth
e
r
advan
ce
d
co
mpute
r
l
a
ngua
ge, L
a
b
V
IEW is a
g
eneral-purpo
se
prog
ram
m
ing
lang
uag
e,
has the fu
n
c
tion
s of
p
o
we
rful va
ri
ety, various,
incl
udin
g
d
a
ta
acq
u
isitio
n, GPIB, serial i
n
stru
ment
co
ntrol, data a
n
a
lysis, d
a
ta
d
i
splay a
nd da
ta storage, a
n
d
even n
e
two
r
k functio
n
. La
b
V
IEW also h
a
s
a
pe
rfe
c
t
si
mulation, d
e
b
uggin
g
tool
s,
su
ch
as setting
brea
kp
oints,
singl
e step e
x
ecut
ion. La
b
V
IEW dynam
ic co
ntinuo
us tracking m
o
de, contin
uo
us,
dynamic o
b
servation of the data flow a
nd the cha
n
g
e
s of the pro
g
ram, an
d it
are othe
r tha
n
the
langu
age dev
elopme
n
t environm
ent more conve
n
ient,
more effectiv
e.
Virtual in
stru
ment me
asu
r
eme
n
t sy
ste
m
is
a
thermometer u
s
ed virtu
a
l in
strum
ent
techn
o
logy transfo
rmatio
n
of tra
d
itiona
l; enabl
e
it t
o
have
the
more
po
we
rful featu
r
es.
The
sen
s
in
g ele
m
ent in
strum
e
nt system
te
mperatur
e
se
nsin
g devi
c
e
throu
gh th
e
front en
d of t
h
e
measured o
b
ject, the tempe
r
ature into a vo
ltage or
curre
n
t signal
si
mulation, po
we
r
amplificatio
n, filtering an
d other
pro
c
e
ssi
ng by
sign
al co
ndit
i
oning
circuit
,
transfo
rm i
n
to
stand
ard volt
age
sign
al ca
n be d
a
ta a
c
quisitio
n
card
. In the data
acq
u
isitio
n card
conve
r
ts
the
analo
g
si
gnal
to digital si
gn
al, and the
da
ta acq
u
is
itio
n
comm
and
se
nt to the co
m
puter b
u
s, fo
r a
variety of data acq
u
isitio
n pro
c
e
ssi
ng required by
u
s
ing virtu
a
l in
strum
ent soft
ware ha
s be
en
installe
d at the PC machin
e.
The
tem
p
e
r
a
t
ure often subje
c
ted
to
variou
s distu
r
ban
ce
s that
affect the
detectio
n
accuracy, th
u
s
the
ne
ed f
o
r filteri
ng
proce
s
sing
of
measurement
. The traditio
nal temp
erature
Evaluation Warning : The document was created with Spire.PDF for Python.
ISSN: 23
02-4
046
TELKOM
NI
KA
Vol. 12, No. 8, August 2014: 602
7 –
6035
6028
measuri
ng in
strum
ent i
s
g
enerally re
ali
z
ed
by ha
rd
ware
circuit, b
u
t
this way are
com
p
lex ci
rcuit,
high
co
st, u
n
stabl
e pe
rfo
r
man
c
e
and
other i
s
su
e
s
,
at the
sam
e
time, the
developm
ent
of
instru
ment fu
nction i
s
limit
ed, and th
e
virtual te
st te
chn
o
logy b
a
sed on virtu
a
l
instru
ment
can
solve the
s
e
probl
em
s wel
l
. This p
ape
r based o
n
L
abview te
ch
n
o
logy a
s
the
core, the d
e
sign
method fo
r tempe
r
ature d
e
tection
syst
em ha
rd
wa
re
platform
with com
pute
r
, data a
c
qui
sition
card and oth
e
r
device
s
.
LabVIEW is
a
set of spe
c
ia
lly design
ed for dat
a a
c
q
u
i
s
ition an
d instrument control, data
analysi
s
an
d
data pre
s
en
tation and th
e desi
gn of grap
hical pro
g
rammi
ng so
ftware, the d
a
ta
acq
u
isitio
n of general and
instrum
ents are co
mb
in
ed, can the
desi
gn of virtual instru
me
nt.
Gene
ral
com
puter te
mpe
r
ature te
ste
r
is
signal
a
c
quisitio
n
an
d
pro
c
e
s
sing
system fo
r a
n
intelligent, in
the main
stru
cture
complet
ed by co
mp
uter inte
rnal te
mperature
si
gnal a
c
q
u
isiti
on,
amplificatio
n
and front en
d ha
rd
ware
part of p
r
e
p
roce
ssing
and
data a
c
q
u
isi
t
ion. The p
a
per
pre
s
ent
de
si
gn of te
mpe
r
ature
mea
s
u
r
eme
n
t an
d
data a
c
q
u
isiti
on
system
b
a
se
d o
n
virt
ual
instru
ment La
bVIEW.
2. Dev
e
lopment of T
e
mp
eratu
r
e Acq
u
isition Sy
st
em Base
d on LabVIEW
Tempe
r
atu
r
e
acqui
sition i
s
the first
step to
mea
s
u
r
e all the testing, testing
physi
cal
sign
al gene
ra
ted by the senso
r
sig
nal
s into vo
ltage or cu
rre
nt cla
s
s and the
n
throug
h the dat
a
acq
u
isitio
n card data a
c
q
u
isition tra
n
smissi
on ma
chine, with th
e help of soft
ware co
ntrol
data
acq
u
isitio
n
card
for data
analysi
s
, p
r
o
c
e
ssi
ng. Pr
e
s
sure
for its
simple
p
r
og
ramming,
different
data acqui
sition ca
rd
supp
ort, powerful
data pro
c
e
s
si
ng, friendly
man-m
a
chine
interface whi
c
h
become
s
the best softwa
r
e
control a
nd it
is developm
ent of data acquisitio
n
ca
rd
.
LabVIEW inte
grate
s
all the function
s of t
he hardware
and data a
c
q
u
isition an
d meet the
GPIB, VXI, RS- 23
2 a
nd
RS- 48
5 p
r
oto
c
ol card
comm
unication. It a
l
so fe
ature
s
a
built-in
lib
rary
function
s for
TCP/ IP, ACTiveX and oth
e
r softwa
r
e st
anda
rd
s [2]. LabVIEW i
s
a
n
end
-u
ser to
ol,
it provides a
conve
n
ient way to instrum
ent
prog
ram
m
ing and dat
a acqui
sition
system for th
e
use
r
, p
r
inci
pl
e of u
s
ing
it for
re
sea
r
ch,
desi
gn,
test
a
nd impl
ement
instru
mentati
on system
s, can
greatly impro
v
e work effici
ency.
The
hardware is mai
n
ly compo
s
ed
of
comp
uter an
d si
gnal
con
d
itioning
com
pone
nts,
whe
r
ein the
compute
r
inclu
des a mi
crop
rocesso
r
, me
mory and di
splay, which is mainly used
to
provide
re
al-t
ime data
pro
c
e
ssi
ng p
e
rf
orma
nce.
Th
e
sig
nal con
d
itioning com
pone
nts can
be
GPIB instrum
ent module,
VXI module, PXI module
or inst
rume
nt instrum
ent d
a
ta acq
u
isitio
n
card, it is m
a
inly use
d
for
data a
c
qui
siti
on, sig
nal tra
n
smi
ssi
on. M
o
stly used
at pre
s
e
n
t is th
e
data acqui
sition ca
rd a
n
d
the VXI instrument
mo
d
u
le, esp
e
ci
all
y
the data acqui
sition
card
spe
c
ial for th
e majority of sci
entific an
d
technol
ogi
ca
l personn
el loved. In addi
tion, the virtual
instru
ment
an
d a
go
od
hardwa
r
e
platform of VXI b
u
s syste
m
, it i
s
suitabl
e fo
r o
pen i
n
the
wo
rl
d
scope, hig
h
speed 3
2
bit module
s
suppli
e
r inst
rume
nt bus, a
s
is sho
w
n by Equati
on(1
)
.
L
k
o
k
o
O
L
k
k
k
Q
Q
Q
T
Q
T
T
1
2
2
2
1
2
1
1
(1)
The functio
n
DAQ VI library contain
s
all
t
he NI into the coll
ectio
n
and outp
u
t data type
and p
r
o
c
e
ss
of DAQ prod
ucts. Appli
c
at
ion of insert
in
g the high
-sp
eed an
d direct control i
s
id
eal.
Becau
s
e
of the lo
w p
r
ice, it can
gre
a
tly redu
ce
the
cost of e
a
ch chann
el. Analysis
of La
bVIE
W
libra
ry
functio
n
s, wide appli
c
ation ra
nge, and
the
an
alysis soft
ware
of com
parabl
e. This analy
s
i
s
libra
ry inclu
d
e
s stati
s
tics, introdu
ction,
reg
r
e
ssi
on, linear
algeb
ra,
signal g
ene
ration algo
rith
m,
the time dom
ain and fre
q
u
ency dom
ain
algorith
m
and
digital filter etc.
Tempe
r
atu
r
e measurement
system usi
n
g
optic
al fibe
r probe
wa
s
use
d
a
s
the
sen
s
o
r
,
the temperature field of radiat
ion ab
so
rption an
d transmi
ssion t
h
rou
gh opti
c
al fiber. The fiber
end
con
n
e
c
te
d to a Y
coup
ler, the
optica
l
sig
nal
tran
smissi
on i
s
divided into
two
parts,
and
ea
ch
one h
a
s a n
a
rrow-ba
nd i
n
terferen
ce fi
lter, so
it ca
n be
obtain
e
d
app
roximat
e
ly two different
wavele
ngth
s
of light
sign
a
l
s. Th
en the
optical
si
gnal
by ph
otoele
c
tri
c
conve
r
si
on, an
d
som
e
Evaluation Warning : The document was created with Spire.PDF for Python.
TELKOM
NIKA
ISSN:
2302-4
046
De
sign of Te
m
perature M
easurem
ent a
nd Data
Acqu
isition Syste
m
Ba
sed on
… (Xingju
Wang)
6029
sign
al p
r
o
c
e
ssi
ng o
p
e
r
ati
ons (su
c
h
a
s
am
plific
ati
on, filtering
the si
gnal t
o
facilitate t
h
e
sub
s
e
que
nt) colle
ction, proce
s
sing, an
alysis.
The software
desig
n mainl
y
complete
s the dat
a acqui
sition and
co
ntrol, analysi
s
of test
results an
d reco
rdin
g, data query, al
so
provide
a
convenie
n
t interface for th
e use
r
. The
use
r
interface (fro
nt panel) is a
n
import
ant p
a
rt of virtual instru
ment, se
tting, test results sho
w
that
the
function
s of i
n
stru
ment p
a
r
amete
r
s
is realized
by so
ftware, so
th
e software in
terface
is
sim
p
le
and direct, ea
sy to use. Th
e system is d
e
sig
n
of the user inte
rfa
c
e usin
g LabVIEW8.2 software.
The interfa
c
e
can di
splay chang
es by se
nso
r
, dat
a col
l
ection
card a
nd the conve
r
sion of voltag
e
waveforms,
and the
cali
bration
is
ob
tained afte
r t
e
mpe
r
ature
values
we
re
displ
a
yed
u
s
ing
waveform, an
d nume
r
ical method
s, ada
pt to the need
s of different
use
r
s
The system use
s
Rem
o
DAQ-80
17S
8
analo
g
inp
u
t module,
th
e data
a
c
qui
siti
on
an
d
control mod
u
l
e
ba
sed o
n
RS-4
85 net
work [3]. They
provide
anal
o
g
input, anal
o
g
output, digit
a
l
input an
d ou
tput, dingshi
q, cou
n
ter, A
C
dat
a
acqui
sition, wi
rele
ss
co
mmuni
cation an
d ot
her
function
s. Th
ese
modul
es can
be by t
he comma
nd
remote
co
ntrol. Remo
DAQ-80
17SV i
s
8
cha
nnel volta
ge input mod
u
le, as is
sho
w
n by Figu
re
1.
Figure 1. Lab
VIEW Tempe
r
ature Data A
c
qui
sition Pro
g
ram
The ta
sk of
data a
c
qui
siti
on
system,
specifi
c
ally, is to sim
u
late
the new acquisition
sen
s
o
r
o
u
tput
and
co
nvert
ed into
digital
sign
al t
hat
a
comp
uter ca
n
re
cog
n
ize, a
nd then
sent
to
the com
pute
r
, the comp
uter to
calculat
e and
pro
c
e
s
s a
c
cordi
ng t
o
different n
e
eds, the
req
u
i
red
data. At the same time,
the cal
c
ulat
ed data to
d
i
splay an
d p
r
int, so that
certai
n phy
si
cal
surveill
an
ce.
The ta
sk of
data a
c
q
u
isiti
on
syst
em
can
kno
w
d
a
ta a
c
qui
sition
system
ha
s the
followin
g
fun
c
tion
s: data
acq
u
isitio
n, a
nalog
si
gnal
processing,
digital
sig
n
a
l p
r
o
c
essin
g
, a
swit
ch si
gnal
pro
c
e
ssi
ng, two data
cal
c
u
l
ation,
displ
a
y, data stora
g
e
,
and print, intera
ctive.
This sy
stem
use
s
Labvi
e
w8.5 a
s
a developm
ent
tool. The simulation dat
a as an
example to t
e
ll the
syste
m
alarm mo
nitoring,
th
e temperature
and
di
spl
a
y function. Usi
ng
Labvie
w8.5 p
r
og
rammi
ng
so that the temperatur
e
ca
n swit
ch bet
wee
n
Fah
r
en
heit and Celsius,
and it is re
al-time monit
o
ring of tem
peratu
r
e. When the tem
peratu
r
e exceed
s the limit
requi
rem
ents will timely li
ght ala
r
m la
mp ala
r
m a
n
d
display the
numb
e
r of
a
c
cumulate
d ti
me
alarm in the
pro
c
e
ss
of collectin
g, alarm limit
value can b
e
thro
u
gh the front
panel
control
s
to
cha
nge its va
lue. Acqui
sition sche
dule
defined for
e
a
ch
colle
ctio
n 100. In ord
e
r to preve
n
t the
prog
ram into
a cycle of de
ath betwee
n
each acq
u
is
iti
on time is interval for 100
0ms. Start after
the colle
ction
of througho
ut the acqui
sition pro
c
e
s
s may susp
en
d the acq
u
isi
t
ion in orde
r to
kee
p
the temperatu
r
e
wa
s observed.
Vi hiera
r
chi
c
a
l
gra
ph
with
VI icon
s
rep
r
ese
n
ting e
a
ch VI, clea
rly
sho
w
s the
hi
era
r
chical
Pyramid
stru
cture, ea
ch
su
b VI VI "Tem
peratu
r
e
Sy
stem Demo.vi"
the next laye
r is i
n
trod
uced
in
the previou
s
pape
r to the sub VI, and a
sub VI the
next layer also
calls the L
a
b
V
IEW functio
n
in
the function l
i
bra
r
y for example, Digital Therom
ete
r
.vi Deviation a
nd Varian
ce.
v
i called Std is
use
d
to
cal
c
ulate the
sta
ndard d
e
viation, the
s
e fu
nction
s a
r
e
listed i
n
the t
h
ird l
a
yer. T
h
e
hiera
r
chy of
prog
ram
is si
mple, only to
the thi
r
d lay
e
r i
s
ove
r
, b
u
t the a
c
tual
pro
g
rammin
g
i
n
some
more
complex p
r
og
rams
are
often
deep l
e
vel st
ructu
r
e, the V
I
hiera
r
chy di
agra
m
st
ru
ctu
r
e
diagram for b
r
owsin
g
structure effect is
more o
b
viou
s [4].
Evaluation Warning : The document was created with Spire.PDF for Python.
ISSN: 23
02-4
046
TELKOM
NI
KA
Vol. 12, No. 8, August 2014: 602
7 –
6035
6030
}
)
(
)
(
)
(
)
(
{
M
)
(
|
)
(
2
)
(
0
1
)
(
T
1
-
|
k
k
k
k
k
k
k
k
s
a
s
s
a
a
s
E
(2)
The sy
stem
use
s
DSl882
0 to mea
s
u
r
e
tem
perature,
and the b
a
si
c re
qui
reme
n
t
s for all
1-Wire b
u
s a
s
the co
mmu
nicatio
n
port:
micro
p
ro
ce
ssor m
u
st be
bidire
ction
a
l, who
s
e o
u
tput
is
an op
en d
r
ai
n, and the lin
e with
wea
k
pull-u
p
;
micro
p
ro
ce
ssor m
u
st be
stand
ard sp
eed 1
-
Wi
re
comm
uni
cati
on requi
red
to produ
ce
a
c
curate
1
U
S delay; com
m
unication
p
r
ocess
ca
nn
ot be
interrupted.
T
he
system
fo
r the
mea
s
u
r
ement
of tem
peratu
r
e
an
d
humidity m
e
asu
r
em
ent a
n
d
control
syste
m
, the fre
que
ncy i
s
not
hig
h
, so
the
syst
em ad
opts AT90S85
15 M
C
U re
ceive
s
t
h
e
temperature,
humidity data
,
and from the RS
232 p
o
rt
to transfer d
a
ta to a comp
uter.
The vario
u
s
kinds of data a
c
qui
sition
system
is diverse, the purpo
ses an
d functi
ons a
r
e
also
different
, there a
r
e
several
comm
on cl
assification metho
d
s:
according t
o
the fun
c
tio
nal
cla
ssifi
cation
of data a
c
qui
sition
system
: data colle
cti
on an
d data
distrib
u
tion: a
c
cordi
ng to t
h
e
data a
c
q
u
isiti
on
system
to
ada
pt to th
e
environ
m
ent: cla
ssifi
cation
of
isol
ated an
d
no
n
i
s
olate
d
type, cent
rali
zed
an
d di
stri
buted, hi
gh,
medium
an
d
low
sp
eed
type; cl
assification a
c
cording
to
the control
d
a
ta a
c
qui
sitio
n
sy
stem: int
e
lligent
d
a
ta
acqui
sition
system, n
o
n
intelligent
d
a
ta
acq
u
isitio
n system; according to the n
a
ture
of the
analo
g
sig
nal
: voltage sig
nal and
cu
rrent
sign
al, high signal an
d a low level si
gn
al, a single e
nded in
put (SE) and the
differential in
put
(DE), u
n
ipol
a
r
and
bipol
ar;
cla
ssifi
cation
according
to
the stru
ctu
r
e
of the sig
nal
cha
nnel:
sin
g
le
cha
nnel, mult
i-ch
ann
el mo
de.
Measurement
data acqui
si
tion modul
e to ac
hi
eve th
e temperature and the
co
llected
data a
r
e
stored into
a dat
a table, to p
r
epare fo
r the
follow-up
dat
a processin
g
, com
puting
a
nd
printing.
Data
acq
u
isition i
s
the main fun
c
tion
of the
system soft
wa
re, data p
r
o
c
essing, d
r
a
w
i
ng
and oth
e
r m
odule
s
[5]. L
abVIEW can
displ
a
y the
waveform of
the data a
c
q
u
isition m
odu
le.
Whe
n
the
d
a
ta acqui
sitio
n
mod
u
le to
colle
ct
the
measured si
gnal,
a discrete
set of
si
gnal
values, th
rou
gh the
gra
p
h
i
cal di
spl
a
y control
s
o
n
a
comp
uter
display point by
point an
d li
ne
displ
a
y, can d
i
splay the me
asu
r
ed
sign
al
, as is sh
own by Equation (3).
)
(
cos
1
2
/
)
(
sin
2
)
(
2
1
2
/
0
,
1
f
l
l
L
f
f
H
l
L
l
L
L
(3)
At the same
time the highe
st tempe
r
atur
e re
al-ti
m
e mea
s
u
r
e
m
ent syste
m
is also
con
s
tantly
m
onitor and re
cord
the obj
ect
ap
pea
red
and th
e lo
west temp
erat
ure
dete
c
tion
of
obje
c
ts, so y
ou can
bette
r state,
at the sa
me
time
, the syste
m
also
ha
s al
arm a
nd
alarm
function.
Wh
en the temp
eratu
r
e of th
e obje
c
t
bey
ond the n
o
rmal ran
ge, b
u
t in the allo
wed
temperature range,
the sy
stem will giv
e
a wa
rnin
g
sign
al;
whe
n
the temperature ex
cee
d
s
the
allowable ran
ge,
the syste
m
di
re
ctly ala
r
m. In a
c
cord
ance wi
th th
e
above p
r
o
c
e
dure
conne
cti
o
n
and set pa
ra
meters, stan
d-alo
ne o
peration, begin
to colle
ct, then sin
g
le fro
n
t panel p
a
u
s
e
button.
Thre
e
wire
P
T
100
re
quire
ments lead
s
to thre
e
wire
se
ction
a
r
ea
and
len
g
th
were th
e
same,
ci
rcuit mea
s
u
r
eme
n
t of platin
u
m
re
si
stan
ce
is
gen
erally
not bal
an
ced
brid
ge, pl
atinu
m
resi
stan
ce a
s
a bridge arm resi
stan
ce
bridge,
will lead to the powe
r
su
pply end of a brid
ge,
b
r
id
ge
ar
m ar
e
r
e
sp
ec
tive
ly c
o
n
n
e
c
ted w
i
th
th
e
two arm
bri
dge
is lo
cate
d a
d
jacent to th
e
platinum
re
si
stan
ce
and
la
st, wh
en th
e
balan
ce
of
th
e bri
dge, th
e
wire
resi
stan
ce chan
ge
ha
s no
impact
on th
e mea
s
u
r
em
ent re
sult
s, so a
s
to eli
m
in
ate the m
e
a
s
urem
ent e
r
ror ca
used by
wire
line re
sist
a
n
c
e
.
The virtual i
n
strum
ent fro
n
t
panel li
ke in
stru
m
ent op
e
r
ation a
nd di
splay pan
el, a
variety
of pa
ramete
r
setting
s a
nd
data di
spl
a
y
are
complete
d by the
fro
n
t pan
el. On
th
e fro
n
t pa
nel
cli
ck
of the mouse
on the param
eter setting
can
be a
c
hiev
ed, as in a re
al instru
ment.
In preci
s
ion
i
n
stru
ment,
weak si
gnal
d
e
tecti
on,
aut
omatic control in
strum
ent
s, al
ways
want to offset
voltage operational amplif
ier to
be sm
a
ll and do not
vary with temperatu
r
e. Lo
w
drift op
eratio
nal am
plifier i
s
d
e
si
gne
d f
o
r thi
s
purpo
se [6]. T
he
commonly
use
d
hig
h
p
r
e
c
isi
on,
low d
r
ift ope
rational am
plifier
with OP0
7
,
OP27, AD508 a
nd
com
posed by M
O
SFET chop
pe
r
stabili
zed lo
w drift device I
C
L7
650. OP0
7
high p
r
e
c
is
i
on ope
ration
a
l
amplifier wit
h
very low inp
u
t
offset voltage; low input
offset voltage dri
ft, noise voltage amplitude
and long-term stability
Evaluation Warning : The document was created with Spire.PDF for Python.
TELKOM
NIKA
ISSN:
2302-4
046
De
sign of Te
m
perature M
easurem
ent a
nd Data
Acqu
isition Syste
m
Ba
sed on
… (Xingju
Wang)
6031
cha
r
a
c
t
e
ri
st
ic
s v
e
ry
low.
A
ccu
rat
e
am
plif
icat
ion is widely use
d
in stable i
n
tegral, p
r
e
c
i
s
e
absolute val
ue ci
rcuit, a comp
arator and a
wea
k
si
gnal, e
s
peci
a
lly suita
b
le for p
r
e
c
i
s
ion
instrument
s in the aerospace, m
ilitary and the requirements of mi
niaturi
z
ation, high
reli
ability.
In this
pap
er, the technol
ogy of virtua
l in
strume
nt techn
o
logy a
s
the
main
mean
s,
adoptin
g
sev
e
ral
way
s
of
monitori
ng, d
a
ta a
c
qui
sitio
n
ha
rd
wa
re
with digital te
m
peratu
r
e
sen
s
or
DS18B2
0
to t
he temp
eratu
r
e of th
e e
n
vironm
ent,
to carry out
data
transmissio
n by
usi
ng sing
le
chip
comp
ute
r
, the machi
n
e in the PC for data p
r
o
c
e
ssi
ng an
d display by LabVIEW softwa
r
e
.
With data
acquisitio
n
, display data in
variou
s wa
ys, alarm, data
recording
an
d histo
r
ical d
a
ta
read
ba
ck fun
c
tion.
Data a
c
qui
si
tion system
is develop
ed in this p
aper, the d
a
ta pro
c
e
s
sing usi
n
g
LabVIEW, co
mpleted the
acq
u
isit
io
n, processin
g
, st
orag
e, pl
ayb
a
ck and di
sp
lay the signa
l;
comp
ared
wi
th traditio
nal
data
a
c
qui
si
tion sy
stem,
its p
r
ice i
s
l
o
w, the
u
s
e
of strong,
sh
ort
developm
ent
cycle, th
e dat
a proc
essin
g
is
simpl
e
an
d convenie
n
t. In the a
c
tual
develop
ment
,
LabVIEW
sh
owe
d
go
od fl
exibility. The SCM data
ac
quisitio
n
sy
stem und
er th
e
environ
ment
of
LabVIEW ha
s a strong e
ngine
erin
g
practicability, and ca
n be wi
dely use
d
in test and cont
ro
l
field.
3. Applicatio
n of Virtual Instru
me
nt in
Temperatur
e Measur
e
m
e
nt
Virtual in
stru
ment i
s
referred to
as VI, i
s
a
PC in
stru
ment
with virt
ual p
anel,
co
mposed
of hardware
and inte
rfa
c
e,
PC ma
chi
ne,
the devi
c
e
driver softwa
r
e
and virtu
a
l in
strum
ent p
a
n
e
l.
The ha
rd
wa
re interfa
c
e, a
nd can be
of variou
s PC
b
a
se
d built-i
n functio
n
card
s su
ch a
s
DA
Q,
gene
ral
purp
o
se
interfa
c
e
bu
s GPIB in
terface
card
,
seri
al inte
rfa
c
e an
d VXI b
u
s i
n
terfa
c
e,
or
other
progra
mmable
exte
rnal te
st e
qui
pment [7].
T
he d
e
vice
dri
v
er softwa
r
e
is d
r
iven
dire
ctly
control the v
a
riou
s h
a
rdware inte
rfa
c
e.
Virtual
in
stru
ment for di
re
ct co
mmuni
cation thro
ugh
the
low laye
r d
r
i
v
er software
and
real i
n
st
rume
nt sy
ste
m
, and di
spl
a
y variou
s
control
s
of virt
ual
instru
ment
pa
nel a
nd the
real in
stru
men
t
operat
ion correspon
d
to the
elem
ents in
the scre
en of
comp
uter by
usin
g virtual instru
ment pa
nel form.
DS18B2
0
di
g
i
tal tempe
r
atu
r
e
se
nso
r
wi
ring i
s
conve
n
i
ent, pa
ckage
d a
s
can
be
applie
d
in many o
ccasio
n
s,
su
ch
as the
pip
e
line type,
scre
w type, mag
net ad
so
rptio
n
, stainle
s
s
steel
packa
ge type
, type is varied, there
are
LTM887
7,
L
T
M887
4 and
so on. Th
e
main chan
ge
in
appe
ara
n
ce i
s
a
c
cording t
o
differe
nt ap
plicatio
ns. After the
DS1
8
B
20 pa
ckag
e
can
be
used
for
cabl
e
chan
n
e
l tempe
r
atu
r
e, bla
s
t furn
ace
ci
rcul
atin
g water te
m
peratu
r
e,
boil
e
r tem
peratu
r
e,
room temp
erature, ag
ricul
t
ural green
ho
use temp
erature, cle
an ro
om temperat
ure, ammu
nition
and othe
r n
on limiting tempe
r
ature measurement
occasio
n
s. Wea
r
-re
s
ista
nt
touch,
small
volume, co
nvenient u
s
e,
packa
ging fo
rms,
spa
c
e
equipm
ent fo
r a variety o
f
small area
s of
digital tempe
r
ature me
asurement and
co
ntrol.
Figure 2. Single Bus Port
DSl8B20
Dia
g
ram
The DS1
8
B2
0 pin a
s
sh
o
w
n in Fig
u
re 2. Each DS
1
8
B20 can be
set to one of t
w
o po
we
r
sup
p
ly mod
e
s
, nam
ely the
data b
u
s po
wer supply m
ode a
nd
external
po
wer su
pply mod
e
. T
a
ke
the data
bu
s
powere
d
mo
d
e
can
save
a
wire, but
the c
o
mp
le
tio
n
of te
mp
e
r
a
t
u
r
e me
as
ur
e
m
en
t
for lon
g
peri
o
ds
of time; ta
ke th
e exte
rn
al po
we
r
sup
p
ly mode,
wit
h
a
wi
re, b
u
t the me
asurem
ent
of spee
d.
Evaluation Warning : The document was created with Spire.PDF for Python.
ISSN: 23
02-4
046
TELKOM
NI
KA
Vol. 12, No. 8, August 2014: 602
7 –
6035
6032
LabVIEW bl
o
ck
diag
ram
of the pro
g
ram, wi
thout
conve
n
tional
prog
ram
m
in
g syntax
rest
rictio
n. First of all, ch
oose the fun
c
ti
on no
de n
eed from th
e
menu fun
c
tion, positio
n i
s
positio
ned on
the panel will; and then use the lin
e (Wi
re
s)
conn
ecting p
o
rts i
n
the prog
ra
m
grap
h of
ea
ch fun
c
tion n
o
de, is u
s
ed t
o
tran
smit
da
ta between
n
ode
s in th
e f
unctio
n
. The
s
e
node
s incl
ud
e simple a
r
ithmetic a fun
c
tion ar
e adv
anced data a
c
qui
sition an
d analysi
s
an
d is
use
d
to store and retriev
e
data file in
put and
o
u
tp
ut function
s
and net
wo
rk function. Using
grap
hical VI
LabVIEW
de
veloped
is hi
era
r
chical a
n
d
mod
u
la
r [8]
.
We
ca
n b
e
use
d
for the
top-
level pro
c
edu
res, can also
be used for other
pro
g
ra
m or sub
r
out
ine sub
p
rogram. Appare
n
t
ly
LabVIEW attachm
ent and
developme
n
t of the c
once
p
t of modular prog
ram de
sign. Graphi
ca
l
prog
ram p
r
o
g
r
ammin
g
is si
mple and intu
itive, the developme
n
t of high efficien
cy.
This p
ape
r p
r
esents the d
e
velopme
n
t o
f
te
mperatu
r
e
measureme
n
t system
ba
sed
on
LabVIEW2
01
0, according t
o
the de
sign
prin
ciple
of
lo
cal in
gene
ral
,
through th
e
analysi
s
of th
e
system fun
c
ti
on; the wh
ol
e system i
s
divided into
several p
a
rts t
o
achi
eve dif
f
erent fun
c
tio
n
s
,
and e
a
ch pa
rt of the de
sign
. In orde
r to realize
the fun
c
tion of the te
mper
ature de
tection syste
m
,
the sy
stem i
s
divided i
n
to t
w
o
part
s
of u
pper ma
chin
e
and l
o
wer
m
a
chi
ne: up
pe
r machine
is a
PC ma
chin
e
with La
bVIEW20
10
software, the
lower is a
sm
all sy
stem a
nd
sin
g
le chip
com
pute
r
and p
e
rip
h
e
r
al ci
rcuit. The
two pa
rts
are to commun
i
cate th
rou
g
h
the PC m
a
chine in th
e USB
seri
al po
rt. The output
of which the
slave
part
mainly com
p
letes the te
mperature
si
gna
l
acq
u
isitio
n and temperatu
r
e data; upp
er part to
co
mplete the driver on the hard
w
a
r
e, da
ta
pro
c
e
ssi
ng
a
nd
stora
ge,
display, ge
neratin
g ove
r
temp
eratu
r
e ala
r
m a
n
d man
-
ma
ch
ine
interface.
DS18B2
0
su
pport
s
the
"b
us lin
e" inte
rface,
m
e
a
s
u
r
e
m
ent of the
tempe
r
ature range
55
°
C~+1
25
°
C °
C, in
the
-1
0
~
+85
ran
ge,
accuracy i
s
± 0.5 °
C.
In
si
tu tempe
r
atu
r
e directly to
the
"digital bus li
ne" tran
smi
s
sion and it is
greatly
imp
r
o
v
ing the syst
em's inte
rfere
n
ce. Th
e on
-site
temperature
measurement
, suitable fo
r harsh
env
ironment
su
ch
as: envi
r
on
mental
control,
equipm
ent
or pro
c
e
ss cont
rol,
temperatu
r
e cla
s
s co
nsumer el
ectron
ics p
r
od
uct
s
.
The fun
c
tion
s of the p
r
o
g
ram
are t
o
spe
c
ify a n
a
me for th
e
VISA resou
r
ce
se
rial
according to
specific initial
i
za
tion
settings. T
he
polymorp
h
ic in
sta
n
ce
data
con
nectio
n
to
a
VISA
resou
r
ce na
me input can
be determi
n
ed to be us
e
d
. This proce
dure VISA co
nfiguratio
n se
rial
data set to 96
00 bau
d rate,
data bits, parity 8, 0.
Data conversion mo
dule
samplin
g p
r
ocedu
re
s in
a cycle, p
r
e acqui
sitio
n
data
pro
c
e
ssi
ng, i
s
m
a
inly to t
he voltag
e
si
gnal i
s
co
nve
r
ted i
n
to a
te
mperature.
Due to
the
sm
all
voltage
signa
l gen
erate
d
b
y
the thermo
cou
p
le, the
a
c
qui
sition
to t
he am
plified
voltage
signa
l of
the divisio
n
operation, re
duci
ng the v
o
ltage of th
e
r
mo
cou
p
le v
a
lue, the volt
age
sign
al of
the
actual a
rray
are arra
nge
d
on the table, the pr
oced
ure for cl
aim
,
the voltage signal thro
u
g
h
pra
c
tical
con
v
ersio
n
modu
le looku
p
pro
c
ed
ur
e
com
p
arison, wh
en
the voltage si
gnal is colle
cted
by the above indexing tabl
e defined
val
ue, stop, move on to the next cycle of acqui
sition, wh
en
the voltage
sign
al
colle
cted in th
e in
dexing tabl
e
definition of
value,
the voltage sign
al i
s
comp
ared
with a voltage
d
i
viding table,
output
temp
e
r
ature corre
s
pondi
ng a
r
ra
y, a su
ccessf
ul
conve
r
si
on, a
s
is sho
w
n by
Equation (4
).
2
0
01
1
1
(
)
(
)
[(
(
)
],
1
n
i
ij
b
i
y
qy
C
k
I
b
i
f
j
m
h
(4)
This pa
per i
s
the
de
sig
n
of tem
perat
u
r
e me
as
ur
e
m
en
t s
y
s
t
em b
a
s
e
d
on vir
t
u
a
l
instru
ment te
chn
o
logy, the
syst
em
ha
s the adva
n
tag
e
s of
simple
stru
cture,
ea
sy
maintenan
ce,
and ha
s stro
ng universalit
y, the hardware of the system can b
e
desig
ned i
n
to a standa
rd
module, buil
d
new sy
stem
which ca
n d
i
rectly
use,
software can be
modified according
to the
use
r
dem
an
d, the syste
m
can b
e
use
d
fo
r te
mperature m
easure
m
ent
in som
e
ha
rsh
environ
ment, with a ce
rtain
value.
VISA is a ge
neral te
rm fo
r an I/O interf
ace
software
libra
ry and
st
anda
rd. Th
e
pre
s
en
ce
of I/O interfa
c
e
software
i
n
the i
n
strum
ent an
d th
e
i
n
stru
ment
dri
v
er, co
mplete
the di
re
ct da
ta
stora
ge o
peration of inst
rume
nt internal re
giste
r
s,
and provid
es the u
nde
rlying softwa
r
e
informatio
n transfe
r for in
strum
ents a
n
d
instru
m
ent
driver. Appli
c
ation of Lab
VIEW icon (i
.e.
instru
ment d
r
iver)
set the
seri
al po
rt, serial d
a
ta rea
d
ing. Becau
s
e all the M
o
Ren
se
rial p
o
rt
setting
s (96
0
0bp
s 8 data
bits, 1 stop, 1 bit
start,
no hand
sh
ake signal
), the lowe
r posit
ion
Evaluation Warning : The document was created with Spire.PDF for Python.
TELKOM
NIKA
ISSN:
2302-4
046
De
sign of Te
m
perature M
easurem
ent a
nd Data
Acqu
isition Syste
m
Ba
sed on
… (Xingju
Wang)
6033
machi
ne g
a
th
ering
proced
ure
s
comply
with the
a
g
re
ement, the di
rect
use
of re
ading i
c
on
re
ad
seri
al data.
DSl882
0 si
gn
al by sin
g
le
b
u
s
comm
uni
cation p
r
ot
o
c
ol
stri
ct and
it is in
ord
e
r to
ensure
the integ
r
ity of the data.
The p
r
oto
c
ol
define
s
several type
s of
sign
als:
re
set pulse, imp
u
lse
respon
se,
wri
t
e 0, write, re
ad. In ad
ditio
n
to im
p
u
lse resp
on
se, all
of these si
gn
als
are
issu
e
d
by
the ho
st
synchroni
zatio
n
si
gnal. All
data
and
comma
nd b
u
s tra
n
smissi
on
is in
bytes, lo
w in
the
front.
Usi
ng DS18
B20 chip
te
mperature
m
easure
m
ent
t
e
mpe
r
ature
can
refle
c
t the
tren
d of
system
on
ch
ip. Integrate
d
part
s
of the f
unctio
nal
circuit, so that th
e overall ci
rcuit more
sim
p
le,
build the
ci
rcuit and th
e
welding
ci
rcuit
faster. M
o
re
o
v
er, usi
ng th
e integ
r
ated
block, effe
ctively
avoid outsi
de
interfere
n
ce, improv
e the
accuracy of
measuri
ng ci
rcuit. So the u
s
e of integ
r
at
ed
chip
will become a trend in the devel
opment of
ci
rcuit.
Here we
use
the temperature
chip
DS18B2
0
. DS18B20 is
a
1-wi
re di
gital temper
atu
r
e sen
s
or, 3
pin TO92
small p
a
cka
ge.
T
e
mp
er
a
t
ur
e me
as
ur
e
m
en
t r
e
s
o
lu
tio
n
is 0
.
0
6
2
5
Ԩ
, 16
bit digi
tal qua
ntity is m
e
a
s
ured
by
temperature
sign
extend
e
d
seri
al o
u
tp
ut. The
wo
rki
ng p
o
wer su
pply can
be
i
n
trodu
ce
d in
th
e
distal end, ca
n
al
so be
pro
duced by
the
pa
ra
si
te p
o
wer.
CPU nee
ds
only o
n
e
p
o
rt lin
e
can
a
n
d
many DS18B
20 communi
cation, occupy
the microp
ro
ce
ssor p
o
rt is less, can
sa
ve a lot of lea
d
and logi
c ci
rcuit.
The syste
m
of compute
r
and powerf
u
l gr
ap
hical prog
ram
m
ing
software La
bVIEW
together,
set
up mea
s
urement and
control appli
c
ation p
r
og
ram ba
sed o
n
com
puter
with
flexibility;
finally const
r
uct a system that
meets
your needs. The sy
stem
consist
s
of the followi
ng
parts: a
Lab
VIEW comp
u
t
er, MPC89E
52 micro
c
ont
rolle
r, a leve
l conve
r
si
on
chip MAX2
3
2
,
temperature sen
s
o
r
DS1
8
B
20.
In this pape
r, using the
virtual instru
ment
techn
o
l
ogy to con
s
truct the tem
peratu
r
e
measurement
system
brea
ks th
ro
ugh
th
e traditio
nal i
n
stru
ment
s in
the data
pro
c
e
ssi
ng, di
spl
a
y,
transmissio
n and sto
r
ag
e of such co
nstraints,
re
du
ce the hard
w
are cost a
n
d
duplication
of
developm
ent, which ma
kes the
syste
m
hard
w
a
r
e
maintena
nce, expansi
o
n
and up
gra
d
ing
softwa
r
e is v
e
ry conve
n
ie
nt. Especially
for as
long
as the ori
g
in
al prog
ram fo
r minor
cha
n
ges,
the u
s
er can
according
to
their o
w
n
ne
eds, th
e
in
strument to
de
sign a va
riety
of perso
nali
z
ed
displ
a
y an
d o
peratin
g p
a
n
e
l. At pre
s
e
n
t, with L
abVIEW a
s
th
e
sof
t
ware
platfo
rm of the
virtu
a
l
instru
ment t
e
ch
nolo
g
y is becoming t
he develo
p
in
g dire
ction
of the mode
rn temp
eratu
r
e
measurement
and the wh
ol
e test field.
4. Design of Temperatur
e Measur
e
ment and
Data Acquisitio
n
Sy
stem Based on Virtual
Instrument LabVIEW
This pa
per o
n
the develo
p
ment of sof
t
wa
re d
e
velo
pment enviro
n
ment of La
bVIEW
softwa
r
e
are
introdu
ce
d, a
nd the
n
int
r
o
duced th
e
system
user l
o
gin, self-te
s
t, temperature
and
humidity mon
i
toring, data
pro
c
e
ssi
ng, d
i
splay an
d alarm, re
co
rd
data and hi
st
orical data re
ad
back fun
c
tion
desig
n.
In the syste
m
of multi point temperat
ure me
asure
m
ent, tempe
r
ature mea
s
urem
ent
method
is th
e tra
d
itional
analo
g
sign
al
rem
o
te
sam
p
ling fo
r A
D
conve
r
si
on,
and i
n
o
r
d
e
r to
obtain hig
h
e
r
measurement
accuracy
, we
must ad
opt the mea
s
u
r
e
s
to solve the p
r
oble
m
of lon
g
distan
ce tra
n
s
missio
n, error com
pen
sa
tion for
multi points me
asu
r
ing switchin
g and amplifying
circuit ze
ro drift caused by.
With digital te
mpe
r
ature chip DS18B2
0
temperatu
r
e measurement
,
digital outp
u
t
sign
al. Easy t
o
han
dle
and
co
ntrol M
CU, many pe
riph
eral
circuit
s
o
f
the traditio
n
a
l
measuri
ng m
e
thod of
elim
inating. Th
e
physi
cal
a
n
d
che
m
ical p
r
opertie
s
and
the chi
p
i
s
very
stable, it
ca
n
be
used fo
r indu
strial
te
mper
ature
m
easure
m
ent
element, the
eleme
n
t lin
ear
better. In the 0 - 100 de
gre
e
s Celsi
u
s, th
e maximum linear e
r
ror i
s
less than 1 de
gree
cel
s
iu
s.
The temp
era
t
ure si
gnal
b
y
the DS18
B20 di
gital t
e
mpe
r
ature
sen
s
o
r
, sm
al
l system
comp
osed
of
a sin
g
le
chi
p
comp
uter t
o
collect the
tem
peratu
r
e
sig
n
a
l, and th
en t
he data
will
b
e
transmitted to
the compute
r
thro
ugh P
C
seri
al
data
RS-232,
run
n
in
g on the
com
puter
LabVIE
W
prog
ram a
nal
ysis to the input pro
c
e
ssi
n
g
, the re
sult
s will be displa
yed by the computer, an
d the
comp
uter L
a
b
V
IEW to com
pare the
set tempe
r
ature value, reali
z
e
alarm fun
c
tio
n
.
The DSl8B2
0
digital therm
o
meter p
r
ovi
des 9 bi
t (bin
ary) temp
erat
ure readi
ng
s; indicate
the tempe
r
at
ure
of the d
e
v
ice [9]. The i
n
formatio
n
af
ter
the singl
e interface
into the
DSl8B2
0 or
from the
DSl8
B20 se
nt fro
m
t
he ho
st CPU to the
DSl8B20, so
only
a line (and
ground
). Becau
s
e
each
DSl8B2
0 in
the fa
cto
r
y ha
s
bee
n
given a
uni
qu
e seri
al n
u
mb
er, a
nd it i
s
so any
num
be
r of
Evaluation Warning : The document was created with Spire.PDF for Python.
ISSN: 23
02-4
046
TELKOM
NI
KA
Vol. 12, No. 8, August 2014: 602
7 –
6035
6034
DSl8B20 m
a
y be sto
r
ed in t
he same
sing
le bu
s wh
i
c
h
allows the te
mperature
se
nsitive device
in
many differe
nt place
s
. Th
e measurem
ent rang
e of
DSl8B20 fro
m
-55 to +12
5
, the incre
m
ental
value is 0.5.
Figure 3. De
sign of Tempe
r
ature Mea
s
u
r
eme
n
t and
Data Acqui
sitio
n
System Based o
n
Virtual
Instrum
ent La
bVIEW Diag
ram
One of
the bi
gge
st
charact
e
ri
sti
c
s of
DS
18B20
uses the d
a
ta
transmissi
on of sin
g
le
b
u
s,
temperature measuri
ng
de
vice
is com
p
o
s
ed of
di
gital thermom
e
ter DS182
0
an
d micro
controll
er
AT89C51, di
gital si
gnal
which
is directl
y
output
tem
peratu
r
e,
ca
n
be
dire
ctly conne
cted
to t
he
comp
uter. In
this
way, st
ructu
r
e te
mp
eratu
r
e
m
e
a
s
urem
ent sy
stem is
relativ
e
ly simpl
e
, the
volume i
s
sm
all, and
the
AT89C51
ca
n t
a
ke
mo
re th
a
n
on
e
DSB18
20, so it
ca
n
be ve
ry ea
sy
to
reali
z
e multi-point mea
s
u
r
ement.
This pa
per focuses o
n
the monitoring inte
rfa
c
e u
s
ing L
abVIEW dev
elopme
n
t
environ
ment
de
sign
of t
he h
o
st
co
mputer,
ho
st com
pute
r
RS232
seri
al port
and
8
9
E52
comm
uni
cati
on
th
rou
gh USB,
tempe
r
ature
mea
s
u
r
ement data
i
s
rea
d
from the
temp
erat
ure
sen
s
o
r
DS1
8
B
20, so a
s
to reali
z
e the re
al-t
ime dete
c
t
i
on of the temperatu
r
e p
a
ra
meter.
5. Conclusio
n
The pa
per
prese
n
ts de
sig
n
of temperatur
e me
asure
m
ent and d
a
ta acq
u
isitio
n syste
m
based
on virtual in
strum
e
nt LabVIEW.
This pa
pe
r de
scribe
s t
he d
e
si
gn
of a temp
erature
detectio
n
sy
stem based o
n
LabVIEW.
The temp
erat
ure d
e
tectio
n
system i
s
m
a
inly to achi
e
v
e
the follo
wing
functio
n
s: th
e re
alization
of se
rial co
m
m
unication b
e
twee
n
PC
a
nd singl
e chi
p
microcomput
er, ca
n timel
y
send the te
mperature
da
ta sent to the
PC machine
,
and in the
PC
interface stro
ke cu
rve, sho
w
ing
temp
era
t
ure
i
n
tuit
ive
;
d
e
t
e
c
tion
pa
ra
me
te
rs
s
how
e
d
:
s
u
c
h
as
the
test time, the set tempe
r
atu
r
e, the cu
rren
t tem
peratu
r
e
,
when the te
mper
ature excee
d
s
a ce
rta
i
n
a ra
nge
of a
l
arm; real-tim
e monito
ring
of temp
e
r
at
ure
cu
rve di
splay, but
al
so h
a
s a di
g
i
tal
displ
a
y and waveform di
spl
a
y.
Referen
ces
[1] Dong
L.
W
i
re
less te
mp
erat
ure
me
asur
e
m
e
n
t a
nd
ala
r
m
devic
e b
a
sed
on s
i
ng
le
bus
di
gita
l
temp
eratur
e se
nsor
. WASE Globa
l Conf
erenc
e on Scie
nce E
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