TAP CHi KHOA HOC DHSP TPHCM ^o 8(74) ndm 2015 \ XAY DL^G MOT SO THI NGHIEM SÛ DUNG CAM BIEN SIEU AM VA PHAN MEM LABVIEW DE DAY HOC CHÛ OHVG D O N G HOC VAT LI 10 N G O MINH NHUT'''', MAI H O A N G P H[.]
Trang 1\.XAY DL^G MOT SO THI NGHIEM SU^ DUNG CAM BIEN SIEU AM
VA PHAN MEM LABVIEW
DE DAY HOC CHU^OHVG D O N G HOC - VAT LI 10
N G O MINH NHUT', MAI H O A N G P H L / O N G "
TOM TAT
Bdi bdo ndy trinh bdy img dung phdn mim Labview, Card USB Arduino vd cdm bien sieu dm trong viec xdy dung bg thi nghiem co khd ndng do dac, thu nhgn vd xu li chinh xdc cdc dgi lugng vdt li vi chuyin dong ca hgc Vai su ca dgng, ghi nhdn lien tuc vd giao dien giao tiip v&i mdy tinh dan gidn bg thi nghiem ndy co the giup gido vien, hgc sinh thuc hien cdc thi nghiem kiim chung vi cdc dang chuyen dgng trong chuang "Ddng hpc chat difim " - Vdt li 10 a tren lap hgc hay ngay & nhd
Tir khda: Card USB Arduino, cam bifin sifiu am, phdn mfim Labview, thi nghiem vat li
ABSTRACT
Constructing some experiments using ultrasonic sensors with Labview software to teach
Kinetics in grade 10 Physics
This paper presents an application of the Arduino UNO Card, ultrasonic sensor and Labview software in the construction of a pilot program, which measures Ihe physical quantities of the mechanical motion With its mobility, continuous recording and simple computer user interface, the pilot program can help teachers and students easily perform verification experiments in the classroom or at home
Keywords: Card USB Arduino UNO, Ultrasonic sensor, Labview, experiment
L Gidi thieu nghiem da dugc trang bi va da duac
Trong day hpc phdn co hpc d nghien ciiu sii dung trong day va hpc vat THPT, viec nghien ciiu cae qua trinh cd li Cu thfi nhu cac thifit bi ghep ndi may dien bifin nhanh nhu chuyen ddng ciia tinh \ a cac phan mem tuong iing cua cac cac vat ludn gap khd khan rat Idn trong hang nhu: Gassy, Phywe (Diic), Pasco, vifie xac dinh vi tri ciing nhu gia tdc, van Vernier (IVK), Coach (Ha Lan) 6 Viet ldc cua vat d mdt thdi diem bdt ki nao dd Nam, da cd nhifiu dfi tai luan an, khoa Neu nhu trudc da\' de khao sat chuyfin luan nghifin ciiu sir dung cac thiet bi thl ddng cua mgt vat, la Ihudng sii dung nghiem ghep ndi may tinh va thi nghiem phuong phap dung cdn rung difin, chup phdn tich video ho trg trong vific day hpc dnh hoat nghifim, hoac do thdi gian nham ndng cao chdt lugng va hieu qua chuyfin ddng bdng ddng hd hifin sd va day hpc vat Ii nhu: luan an tifin sT ciia tac cdng quang dien thi hifin nay mfit sd bd gia Nguyfin Xudn Thanh (2003) vdi dfi tai thi nghifim ghep ndi vdi may vi linh cimg "Xay dyng phdn mfim phdn tieh video va vdi cac phan mfim xCr li so lieu thi td chiic hoat ddng nhan thiic ciia hpc sinh
;_SV Truang Dgi hpc Sif pham TPHCM; Email minhnhutcom@gmail.com
ThS, Tfircrng Dgi hpc Si/ phgm TPHCM
Trang 2trong day hpe cac qua trinh co hgc bifin
ddi nhanh theo quan diem li luan day hpc
hifin dai" [7]; Iuan van thae sT cua tac gid
Le Hoang Anh Linh (2013) vdi dfi tai
"Thiel ke bd thi nghifim co hgc diing cdm
bifin Sonar va sir dung trong day hpc
chuang cac dinh ludt bdo loan - ldp 10
THPT' [3] Nhd vao cac thi nghifim kfit
ndi may linh, phan mfim phdn tich video
ma viec do dac va xir li sd Hfiu thi nghiem
trd nen nhanh chdng va dfi dang hon
giiip cho vific day va hpc vat li cua giao
vifin va hpc sinh dat hifiu qua tdl hon
Tuy nhifin, d Viet Nam cac nghifin
Cliu trong vific thiet kfi, xay dung cac bd
thi nghifim vdt li ket ndi may tinh van cdn
han che hoac chi dimg d miic do nghifin
Cliu sir dyng chua dap iing cho vific trang
bi va diing day hgc vat li d trudng THPT
Mae khae eac bd thi nghiem ghep ndi
may tinh nfiu nhdp ttr nudc ngoai thi gid
thanh rat cao khdng phii hgp vol tifiu chi
xay dung phdng thi nghiem vdt li d
trudng THPT Vi vay, cdn thifit phai chfi
lao cae cam bifin don gidn, gia thanh thap
phil hgp vdi ddi tugng do Xuat phat ttr
nhung khd khan dd, chiing tdi da thifit kfi
va xdy dung mgt bp thi nghifim ed khd
nang do dac cac dai Iugng trong chuyfin
dpng CO nhu tga do, van ldc, gia tdc cua
mgt vdt chuyen ddng mdt each nhanh
chdng vdi dp chinh xac cao bang cam
bifin sifiu am va lap trinh ket ndi bang
phdn mem Labview Tinh mdi ciia bai
bao nay la xay dyng dugc bg thi nghifim
ddp ling nhu cdu d?y hgc vat Ii chuong
dgng hgc vdi gia thanh re, ddng thdi ihifit
kfi dugc chuong trinh trfin may linh vdi
giao dipn bdng tifing Viet Ngoai ra,
chuang trinh cdn cung cap mdt sd bai thi nghiem mau, giao vifin hay hgc sinh cd the dya vao dd dfi thifit kfi them cac bai thi nghifim khac
2 Npi dung Sau mgt thdi gian nghien ciiu va thifit kfi, chiing tdi da xay dyng dugc bd thi nghifim gdm:
Hinh 2.1 Hop chim cdm bien sieu dm
vd bo mgch Arduino
• Mdt bd thi nghifim (hinh 2.1) gdm: Cam bifin sieu am
Board Arduino Day kfit ndi vdi may tinh ca nhan thdng qua cdng USB
• Giao difin ngudi dung tren mdy tinh canhdn (hinh 2.2)
—::;•£ ^H'i.fr
Hinh 2.2 Giao dien chuong trinh tren mdy tinh cd nhdn 2.L Card USB Arduino UNO
Arduino UNO la mdt board mach vi xir Ii cd kha nang kfit ndi, thu nhdn va
Trang 3TAP CHi KHOA HOC DHSP TPHCM
xuAi tin hifiu difiu khifin dfin cac thifit bi
phdn Cling nhu cac cam bifin ddng co
hoac mdt sd thiel bi ngoai \i khdc cung
nhu xii li tin hifiu tra \e tir cam bifin va
cho la ket qua sd lieu can do
Minh 2.3 Board mach Arduino Uno
Trong bd thi nghifim na\ mach
Arduino nhu mdt mach difiu khifin trung
gian gitra may tinh va cam bifin sifiu am
Mach Arduino UNO sc nhan lfinh tir
ngudi dimg thdng qua giao difin tren ma\'
tinh sau khi thyc hifin cac lfinh xong
mach Arduino UNO se trd lai tin hifiu thu
nhdn dugc lir cam bifin sifiu dm Nhd vao
chucmg trinh ma\ linh ma lin hifiu dd se
dugc tin loan \ a cho ra kfit qua cudi cCmg
la khoang each ldi vat can khao sal
2.2 Cdm bien sieu dm
De xdc dinh tpa dp cua vat can khao
sal d nhtmg thdi difim khac nhau chiing
tdi sir dung cam bien sifiu am SRF04
Da\ la Ioai cam bifin do khodng each theo
phuong phap thdi gian tru\'fin cd cdu tao
gdm mdt ddu phat va mdt ddu thu tin hifiu
nhu hinh 2.4
So do cac chdn ciia cam bien SRF04 l.GND 2 Echo 3 Trig 4 Vcc Dfi do khodng each tdi vat can do
bg phat (Trigg) cua cam bifin se xudt ra mdt xung dai 10 ys tan sd 40 kHz Sdng
am tru\ en tdi \ at can do \ a bi phan xa lai
bd thu lin hifiu Neu ggi t la khoang thai gian tir liic phat dfin khi thu dugc tin hieu thi khoang each tdi vat can do tinh theo
cdna thlic d - Vdi V la \ an toe sdng
1234
am trong khdng khi
Do each thlic hoat ddng ciia cam bien sifiu am hoat ddng dya trfin phuang ph^
do thdi gian uuyfin nen cd nhifiu nguyfin nhdn ddn dfin sai sd cua phep do Iam cho
sd lieu thu dugc thifiu chinh xac hoac bi nhifiu Mdt sd ngmfin nhdn chinh sau:
Su thay ddi ciia tdc do truyfin sdng
dm trong khdng khi
Sy luong lae ciia sdng tdi vdi bfi mat ciia ddi tugng cdn do
Tdm quel ciia cdm bien sifiu am co gdc md ldn (khoang 53 dp)
Tir da\ chung tdi dua ra mdt so bifin phap khac phuc trong qua trinh thiet
kc nhu sau:
Khdc phuc su thay doi ciia tdc do truyen song dm trong khong khi: Nhu ta
da bifil van tdc truyfin sdng am trong khdng khi phu thudc vao nhifit dp moi trudng khi nhifii dp mdi trudng thay doi thi van tdc truyfin sdng thay ddi ddn den kfit qud do khoang each se khac nhau khi thyc hien d nhiing ncri cd nhifit do moi trudng khac nhau Vi va> chung tdi sir dung them cam bifin nhiet do LM35DZ dfi do nhifit dp mdi Irudng tai noi tien hanh thi nghifim Cdng thiic gdn diing
Trang 4bifiu difin su phu thudc ciia van tdc truyen
sdng va nhifit do: v ==; 0.6? + 33I(m/.?)
(0.6/-F33l).Ar
suy ra a = -^^
2
Vdi t la nhifit dp mdi trudng (0"C);
AT la thdi gian truyen sdng (s)
Khdc phuc su tuang tdc ciia song
v&i be mat ciia doi tuang cdn do: Khi
sdng dm tac ddng vdi bfi mat ciia ddi
tugng can do, tin hieu bj phan xa theo
nhifiu hudng khac nhau nfiu nhu gdc tdi
cua chiim sdng khdng vudng gdc vdi bfi
mat phan xa hoac be mat phan xa khdng
bang phang Difiu nay lam cho ddu thu tin
hifiu khdng nhdn dugc tin hifiu phan hdi
hodc tin hifin phdn hdi bj phan xa theo
nhifiu hudng khac nhau, each khac phuc
khi lifin hanh khao sat thi nghifim cam
bien sieu dm phai dat vudng gdc vdi ddi
lugng can khao sat, trfin ddi tugng can
khao sat can gan them tam phang ddi
difin cam bifin dfi ddm bao sdng tdi phan
xa tdt
Khdc phuc goc ma cua cdm bien:
Do gdc md cua cam bifin ldn, nen khi
mgt vat nam trong gdc md nay d mdt
khoang each ndo do cam bifin vdn cd thfi
dgc dugc cac tin hifiu, dan dfin hifin tugng
nhifiu Vi vay, khi do khoang cdch, chiing
tdi ldy gia tri trung binh ciia nhifiu Ian do
ddng thdi trong thi nghifim khao sat, vat
cdn di chuyfin trong pham vi tir 10 em dfin
n o cm Sau khi da thyc hifin cdc bifin
phdp gidm sai sd cua cam bien, chiing tdi
thu duge bdng sd Hfiu sai sd eiia cam bifin
theo khodng each do nhu bang 1:
Bdng 1 Sai s(') cua cdm bien sieu dm
u*
10
15
20
25
30
40
50
60
1.61 2.53 2.26 0.37 1.37 1.52
2.6
2.22
v-ip?. H •
70
80
90
100
110
120
150
2.42 1.84
3.2
1.52 3.01 5.04 8.13
Sau khi da xac dinh dugc tga do ciia vat can khao sat d nhtmg thdi diem khac nhau, chiing ldi sir dyng thudt toan tinh dao ham dfi tinh van tdc va gia tdc tire thdi cua
\ at d nhimg thdi difim khac nhau
2.3 Giao dien tren mdy tinh cd nhdn
Dya trfin ngdn ngir lap trinh dd hga Labview chiing tdi da ihici kfi va xdy dyng mdt giao difin ngudi diing don gidn
va true quan Giao difin chuang trinh la noi hien thj sd lieu thi nghifim dudi dang cac dd thi, bang bifiu cung nhu cho phep ngudi diing cd thfi thao tac trong vific thu thap xir Ii sd lieu, luu kfit qua hoac md tap tin Clia cac bai thi nghiem da lam trudc do Cira sd giao difin chuong trinh nhu hinh 2.2
Ket qua thi nghifim dugc thfi hifin thdng qua cac dd thj va bdng sd lieu Thdng qua dd thi ta cd thfi nhdn biet dugc cdc dang chuyfin ddng cua vat can khao sat, ddng thdi ngudi diing ed thfi tinh gia tri trung binh, khdp ham, tinh tich phdn, lim gid tri ldn nhdt, nhd nhdt nhd vao thanh cdng cy xu Ii sd Hfiu Kfit qua thi nghifim cd thfi dugc luu lai dudi dang tap tin cd thanh phan md rgng la txi va md lai tap tin dd khi can sir dyng Ngoai ra
Trang 5giao difin cdn cd phan "Hudng dan su
dung chuong trinh" giup ngudi dung cd
the de dang sir dyng eac chirc nang cua
chuong trinh trong vific thu thap va xir li
sd Hfiu thi nghiem
3 Mot so bai thi nghiem da xay
dung
3.1 TIti nghiem khdo sdt chuyen dgng
thang bien ddi diu
Chuyfin dpng thang bifin ddi dfiu la
chuyen ddng thang trong do dp ldn cua
van ldc tire thdi tang hoac gidm dfiu theo
thdi gian
Phuong trinh tpa dp ciia chuyfin
ddng thang bifin ddi dfiu:
x = x^^v^t + -at' (3.1)
Trong dd Xy VQ la vj tri va van tdc
liic dau cua chuyfin dgng
Phuang trinh van tdc tiic thdi cua
v$t theo thdi gian: v = v^ + at (3.2)
Nfiu vat chuyfin dgng nhanh ddn
dfiu thi a.v > 0 Nfiu vat chuyfin ddng
chdm ddn dfiu thi a.v < 0
3.L1 Bo tri thi nghiem khdo sdt chuyin
dong thdng nhanh ddn diu
Bo tri thi nghiem nhu hinh 3.1
Hinh 3.1 Bo tri thi nghiem khdo sdt
chuyen dgng thdng nhanh ddn diu
Xe khdi lugng m = 0.5 kg dugc ddt trfin thanh ray Thanh ray dugc dat nghieng mgt gdc 20** so vdi mat ban, cam bifin dat phia sau xe (hinh 3.1) Trong thi nghiem khdo sat nay ma sat ciia xe vol tharih ray la khdng dang ke Kfit ndi cam bifin sifiu am vdi cdng USB ciia mdy tinh
va khdi ddng chuang trinh giao dien ngudi diing trfin may linh
Tifin hanh thi nghiem, tha xe khdng van tdc ddu tir dinh thanh ray, xe se chuyfin ddng nhanh ddn xudng chan thanh ray Kfit qua thi nghiem dugc thl hifin tren chuong trinh giao difin may tinh, dya trfin bdng sd lieu thu thap dugc, chiing la se tifin hdnh phan lich dd thi ve dugc va linh dugc cae gia tri van tdc, gia tdc ciia xe chuyen ddng Kfit qua thi nghifim dugc thfi hifin trfin dd thi nhu hinh 3.2
Hinh 3.2 Dd thi tga do - thai gian (a), van tdc - thai gian (b)
Trang 6Ta thdy phan dugc td den d dd thi
the hifin sy thay ddi vi tri ciia vdt cd dang
parabol, va do thi van tdc - thdi gian cd
dang dudng thang cd he sd gdc duong
phu hgp vdi cdng thire (3.2) Sii dung
chlie nang khdp ham dfi so sanh ham sd
thyc nghifim vdi ham sd li thuyfit, tir dd
tim duge phuong trinh tga do ciia chuyfin
dgng va phuong trinh van tdc cua vdt
theo thdi gian
Phuang trinh tpa dp cua chuyfin
ddng: ;c = 0,112 + 0,134/+ 1,66/" (3.3)
Phuong trinh van tdc theo thdi
gian: v = 0,110+3.35/ (3.4)
Tren hinh 3.3 la dd thi bifiu dien
sir thay ddi gia tdc theo thdi gian Gia
tri gia too a thu dugc trong vung dugc
td den cd gia tri thay ddi, do vay.dd thi
nay cd dang gan diing vdi dd Ihi li
thuyet (Do chiing tdi chua tim dugc
cam bien sifiu dm cd chat lugng, ddng
thdi, lap trinh tinh dao ham dya tren sd
lieu toa do, tir dd ddn dfin sai sd trong
each tinh gia toe) Tir dd thj, tinh dugc
gia tdc trung binh trong vung dugc td
den a = 3,38 m/s^
Mac khac, bang phuong phap ddng lyc hgc, ta chiing minh dugc gia tdc cua
xe chuyen ddng tren thanh ray dat nghifing 1 gde a dugc linh theo cdng
thlic: a=gsina (3.5) Tifin hanh thi
nghiem khao sat bang each thay ddi gdc nghifing cua thanh ray so vdi mdt ban do gia tdc mang iing vdi mdi gdc a va so sdnh vdi gia tri tinh theo cdng thiic (3.5)
Bdng 2 Ket qud do gia tdc khi Ihay doi goc nghieng a
30
25
20
15
10
5
4.80 4.13 3.23 2.49 1.65 0.89
4.90 4.14 3.35 2.54 1.70 0.85
2.04 0.24 3.58 1.97 2.94 4.71 Nhan xet: Gia tri gia tdc do dugc gan diing vdi gia tri gia tdc tinh theo H thuyfit (duge chimg minh bang phuang phap ddng lyc hgc) Sai sd ciia phep do nhd hon 5% chiing td bd thi nghiem hoat ddng tuong ddi chinh xac
Ngoai each bd tri thi nghifim nhu trfin, ta cd thfi bd tri thi nghiem theo phuang an 2 nhu hinh 3.4 Vdt chuyfin ddng la mdt chiec xe (1) khdi lugng M -0.5 kg dugc dat trfin thanh ray (2) nam ngang Mdt vat cd khdi lugng m = lOOg ndi vdi xe bang mdt sgi ddy thdng rdng rpc cd khdi lugng khdng dang ke Cam bifin (3) dat phia sau xe
Hinh 3.3 Dd thi gia tdc - th&i gian
cua chuyen dgng nhanh ddn deu
Trang 7Hinh 3.4 Bo tri thi nghiem chuyen
dqng thang nhanh ddn deu theo phuxmg dn
khdc Ket qud thi nghiem duoc trinh bdy
hinh 3.5
Hinh 3.5 Bo thi tpa do - thai gian
khi thtrc hien phuang dn 2
Phucmg trinh toa dp cua chuyen
dpng ling vol viing do thj dupc to den:
.ir = 0,07+0.118/ + 0,707/- (3.6)
Til (3.6) suy ra a = l,14lm/s^ Kat
qua nay gSn bang vdi gia tri tinh theo li
thuyet: a„=J!^=^^^.^.aml,^
m+M 0,1+0.5
(cong thirc nay dupc chirng minh theo
phircmg phap dpng luc hpc)
3.1.2 Bo tri thi nghiem khao sdt chuyin
ddng thang chdm ddn diu
B6 tri thi nghiem nhu hinh 3.6
Hinh 3.6 Bd tri thl nghiem khdo sat chuyen dong chgm ddn deu
Thanh ray dtrgc dat nghieng mpt goc 8° so voi mat ban Trong thi nghiem khao sat nay, ma sat cua xe voi
thanh ray la khong dang kk KSt n6i
cam bien sieu am voi cong USB cua may tinh va khoi dong chuong trinh giao dien nguoi diing
Tien hanh thi nghiem: cung cap cho xe mot van toe ban dau v„, xe se chuyen dpng cham dto dSu d6n mpt vi tri
ma vto toe ciia xe bang khong, xe se dimg lai va chuyen dpng nhanh dta deu ngupc tro lai
Kft qua thi nghiem dupc ihi hien
tren chuong trinh giao dien tren may tinh, dua tren btog s6 lieu thu thap ducrc, chiing ta se tien hanh phto tich d6 thi ve dupc va tinh dupc cac gia tri van t6c, gia tpc cua xe chuyen dpng K6t qua thi
nghiem duoc XVA hien hinh 3.7
Trang 8v<m ,«t y\i
Hinh 3.7 Do thi tga do, van tdc cua
xe khi chuyin dong tren mdng nghieng 8^
Khi xe dugc cung edp van tdc Vo
0,79 m/s (img vdi difim A trfin do thj), xe
chuyen ddng chdm dan dfiu dfin vi tri B, van
tdc xe bang khdng, xe chuyfin ddng nhanh
ddn dfiu ngugc trd lai (do liic na\ thanh
phdn dpc theo mang ciia trgng luc ddng vai
trd la luc keo) Tir B dfin difim C dd thi van
tdc nam dudi true Ot do luc nay xe chuyfin
ddng ngugc chieu so vdi liic dau, ddng thdi
do ldn cua van ldc tang theo thdi gian Gia
tdc trfin doan AB la a - -1.35 m/s^
3.2 Bo tri thi nghiem khdo sdt chuyen
dgng tit dng deu
Chuyfin ddng thang dfiu la chuyfin
dpng cd quy dao la dudng thang va cd ldc
dp trung binh nhu nhau Uen mpi quang
dudng (v = const)
Phuang trinh tga do cua chu>en
dgng thiing dfiu: x-x^-^vt (3.7)
Bd tri thi nghifim nhu hinh 3.8
Trong thi nghiem khao sat nay ma sat Clia xe vdi thanh ray la khdng dang kfi Truyfin cho xe mdt van ldc ban dau
Vo, xe se chuyfin ddng thang dfiu vdi van tdc VQ
Kfit qua thi nghifim dugc thfi hifin d hinh 3.9
Hinh 3.9 Do thi toa do, van tdc theo th&i gian trong chuyen dgng thdng deu
Dd thi tga do - thdi gian la mdt dudng thang phii hgp vdi cdng thiic (3.7) K.hdp ham, chiing ta tim dugc phuang trinh tpa do cua chuyfin dpng img vdi
\'iing dugc td den trfin dd thi: A-= 0.079 + 0.565/
Gia tri van tdc trung binh khdp dugc tir do thi tpa do - thdi gian la 0,565 m/s, gan diing vdi gid trj van ldc trung binh tinh tir dd thi van tdc - thdi gian la 0.546 m/s Nhu vdy vat chuyen thang dfiu vdi van tdc gan bang 0,55 m/s
Hinh 3 H Bo iri thi nghiem
Trang 93.3 Bd tri thi nghiem khdo sdt su rai
tudo
Rai ty do la mdt trudng hgp dac
bifit ciia chuyen ddng thang nhanh dan
deu vdi gia toe a = g = 9,8 m/s' Nhu vay
dd thi tga dp - thdi gian vd do thi van tdc
- thdi gian cd dang gidng nhu trong thi
nghifim thdng nhanh ddn dfiu
Bd tri thi nghifim nhu hinh 3.10
Hinh 3.10 Bo tri thi nghiem
khdo sdt su rai tu do
Trong thi nghiem roi tu do, la phai
chgn vdt nang cd kich thudc nhd dfi giam
lyc can cua khdng khi tac dung vao vdt
Khi trpng lugng ctia vat Idn, la cd thfi bd
qua luc cdn eiia khdng khi va xem nhu
vat roi ly do Tu\ nhifin nfiu chgn vdt ed
kich thudc nhd thi sdng am do cdm bifin
phat ra se khdng thfi phdn xa Iai ddu thu,
do va\ cam bien sfi khdng da dugc
khodng each tdi vat can khao sdt Trong
thi nghifim khao sdt na\ vdl ndng dugc
ehgn de khao sat thi nghifim roi la qua
bdng rd Nfiu khdng can do chinh xac
cao, ta vdn cd thfi coi su rcri ciia qua bdng
gdn dung la sy roi ty do
/" I
3.4 Thi nghiem khdo sdt dao ddn^ dieu hba cua con ldc Ib xo
Bd ui thi nghifim dao dgng ciia cor ldc Id xo gdm: mdt Id xo cd do ciing k, moi ddu dugc mdc vdo gia dd ddu cdn lai tree
qua nang m = 50g Keo qud nang ra khoi \\
tri can bang va tha ra cho dao dgng va khao sat dao ddng ciia con lac Id xo Ket qua thi nghiem dugc trinh bay d hinh 3.12
Hinh 3.11 Do thi tga do - th&i gian
Hinh 3.12 Do thi toa do - th&i gian
ciia con ldc Id xo
4 Ket Iuan va hirdng phat trien ciia
de tai
4.L Ket ludn
Tir vific nghifin ciiu cdc kien thiic
CO ban ve ngdn ngtr lap trinh Labview trong viec kfil ndi vdi cac thifit bi ngoai
vi chting tdi da thifit kfi vd xay dung dugc mgt sd thi nghifim chuong "Dpng hgc chat difim - Vdt Ii 10" bdng cdm bi£n sifiu dm va Card USB Arduino Bd thi nghifim nay da giai quyfit dugc mdt so ban chfi cua cdc bd thi nghifim truyen thdng trong vific do dat vd xii Ii kfit qiia thi nghifim, giiip cho gido vifin va hoc sinh de dang thyc hifin cac thi nghiem kifim chimg trfin Idp hay d nha
Ngoai ra, vdi gia thanh thdp hon r§l nhifiu so vdi cdc bd thi nghifim n h ^ tir nudc ngoai nfin cd thfi trang bi rgng rai 6 cde hirdng THPT (Chi phi cho mpt bg thi nghiem vdo khoang 750.000d)
Trang 104.2 Hu&ng phdt trien cUa de tdi
Bd thi nghiem nay thu nhdn ket qua
tuong ddi tdt d cac dang chuyfin ddng
thang deu, thang nhanh ddn dfiu, eham ddn
deu, dao ddng ciia eon lac Id xo Tuy
nhifin vdn cdn mdt sd khuyet diem cdn cai
lien nhu thdi gian kfit ndi gitra may linh ca
nhdn vdi Card USB Arduino cdn chdm
gay khd khan cho ngudi sir dung; sai sd
cua cam bifin edn ldn (khi vat dat xa hon
1,5m thi sai sd ldn hon 5%); de bi loi kfit
ndi giira may tinh vdi Card Arduino; sai
sd khi tinh eac gia tri dao hdm cua cac dai lugng vat H, dac bifit la khi tinh va ve do thi gia tdc d hinh 3.3 Vi vdy, de khac phuc nhung khuyfit difim trfin, trong thdi gian sap tdi, chiing tdi se tim vd thay the cam bien sifiu dm cd do chinh xac cao hon
de giam sai sd eiia kfit qua thi nghiem Ngoai ra, chung tdi se tiep tuc rad rpng bg thi nghifim nay cho viec thiet ke cdc thi nghiem trong chuong ddng lyc hgc va cac dinh luat bao loan sir dyng them cdm bifin gia tdc va cam bifin Iyc
TAI LIEU THAM KHAO
1 Nguyfin Ba Hai (2011^ Lap trinh LabView Trinh do ca bdn, Nxb Dai Qufic gia TP
Hd Chi Minh
2 Dinh Sy Hifin, Lfi Htm Phuc, Luong Qudc Dung (2004), "Nghifin cim chfi tao KIT
cam bifin ghep vdi NI DAQ PCI 6024E'', Hdi nghi &ng dung vdt li todn qudc ldn
thd-2, TP Hd Chi Minh, thang 12/2004
3 Lfi Hoang Anh Linh (2013), Thiet ke bg thi nghiem co hgc diing cdm bien Sonar vd sir dung trong dgy hgc chuang cdc dinh ludt bdo lodn - l&p 10 THPT, Ludn van Thac
sT Giao due, Trudng Dai hpc Su pham TP Hd Chi Minh
4 Nguyfin Xuan Thanh (2003), Xdy dung phdn mem phdn tich video vd to chuc hoat
dgng nhdn thuc cua hgc sinh trong dgy hgc cdc qud trinh co hgc bien doi nhanh theo quan diem li ludn dgy hgc hien dgi, Luan an Tifin si Giao due, Tnrdng Dai hgc Su
pham Ha Ngi
5 Jeffery Travis, Jim Kring (2006), Labview for everyone Prentice Hall
6 Malan Shiralker (2007), Labview Graphical Programming Course, Rice University,
Houston, Texas
7 http://www ni com
(Ngdy Tda soan nh$n duvc biii: 18-4-2015; ng^yphAn bi§n ddnh gid: 12-5-2015;
ngdy ChSp nhdn ddng: 24-8-2015)