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ll ' Do Van Dialt vd Big Tap chl KHOA HOC & CONG NGHE 151(06): 111-118 i THIET Kfi THIET BI DO, THU THAP, GIAM SAT I MPT SO THONG S MOI TRl/CWb Bd Van Blnh'-, Binh Van Nhuong, Trdn Hadi Link' Vien Bien, Trudng Bgi hgc Bdch khoa Hd Ngi Trudng Bgi hgc Sao Bo T6MTAT Tif kll6.: Thiet bi do: Ihu Ihdp: glim sdt: thing si: mat trudng: nhiet do: da dm i Cha vi^t tat: ADC MMC LCD GPRS PSoC SD SMS SPI IC UART t Analog Digital Converter Multi-Media Card Uquid Crystal Display General Packet Radia Service Programmable System on Chip Secure Digital Short Masage Services Serial Peripheral Interface Intcrgrated Circuit ^"IvGrsal Asynchronous Receiver Transmitter BirVANBt, ' fi'?" "^S"' ' ^ ^* 3™> l^" moi Inicmg khong Ull dang d | t la cap bach n h i m cung cap cac i (Mnh gia v l diln biln ch^t luong mOi ttucmg I W n quy mo quoc gia, phuc vu vice xay dimg bao^cio hien trang moi tniong, cac danh ! gii vl dien bien chat lu(mg moi tnrong • ciia tung viing trpng dilm duoc quan trac d l > phuc vv cac yeu c i u ttic t h « ciia cac cjp quan IJ nha nuAc ve bao ve moi tnicmg, canh bao ' kip thM cac diln biln bit thucmg hay cac nguy CO nhiem, suy thoai moi truing va I xay dimg oa s6 dtt lieu v l chit luong moi tniong^ phiio vii vi$c luu trtt, cung d p va I trao doi thong tin phjim vi q u i c gia va < qu6c tl Vi vjy, iing dung cang biln ! cda cac h? thong ludng, quan ttic moi I tntftng ti4 xa dang 14 nhu c l u tit ylu liong • Tel: CIS! 166160: Emad: dgdinh/Slggmnll.cgm thuc tien san xult va doi s6ng, kinh tl, xa hoi gop phan tranh thien tai, tang nang suit laci dOng, nang cao chit luQng cupc sing Cac thiet bi hicn c6 xu huong cang nh6 gpn, thong minh va da chiic nang Tnrfc day mpt thiet bi quan tiic moi trucmg doi hoi phai CO m?ch thu thap, co clu hiln thi, luu tril r l t cong kenh Voi sir phat triln cua nganh che tao Unh kien dien tii thi chiing ta da co dupc nhiing vi mach tich hop da nang co kha nang tai clu hinh manh me Ta CO the tich hpp nhilu chiic nang hien dai vao thiet bi ma khong yen clu nhieu v i kich thucrc phan cling, Muc tieu cua nghien ciiu bai bao la ling dung cong nghe vi dicn tu mm de thiet ke mpt thiet bi do, thu thJp va giam sat thong sd moi trucmg nho gon, ttiuan tien nhung van CO day du cac chiic nang Thilt bi dupc thilt k l la su tich hpp cong nghe tien tien, sir dyng cac cam biln thong minh, bp vi xii ly da nang, Iuu dii lieu voi dung lupng Ion, Oiu thJp va giam sat du lieu til xa thong qua mang di dong di dona GPRS/30 ^ PHAN TICH, T H E T KE v A LUA CHON THIET BI DO THU THAP, O I A M S A T MOT SO THONG SO MOI TRUCJNG Thiet bi dupc nghien ciiu va thilt kl bai bao la thilt bi do, thu thjp, giam sat nhiet -^^^^ Bd \'an Dinh va Dig Tap chi KHOA HOC & CONG NGHE % a am moi Iruong \ ' a i muc dich xay dung ihiet bi nho gon thuan tien cho vice su dung, CO the chinh \ a c thong so moi truang thu thap so heu \ a giam sal qua mang Thi^t bl dugc thiet ke \-cri mot so yeu cau va chiJc nang nhu sau Dai nhiet tir 0-SOX \ a dai do am tir 30% -100% Thiet bl lam viec duoc lien tuc thoi gian dai \ a moi tnrcmg chong mroc, bui, Thiet bl nho gpn \'an hanh, su dung thiet bi don gian, thuan tien thong qua giao dien, Co kha nang lmi trir gia tri nliiet do am dong bo theo thai gian thuc \'a hen tuc vai chu ky phiiL'lan thm gian khoang nam, Thict bl CO Iinh linh hoat cao qua qua trinh hoat dong - kha nang ma rong va nang ciip dc dang, Hicn thi giii in nhict do am Iren man hinh LCD, doc kcl qua hru IrCr qua giao dien va tra kcl qua ve Microsoft l:xcel, Co kha nang ket noi \ a i may linh lir xa qua mang dl dong GPRSGG So long the cac kiioi chuc nang co ban ciia Ihicl bl dirac trinh bay tren hinh Hinh }.Sifdo khoi cua duet bi De thuc hicn cac chirc nang nhir da neu tren, bai bao de xual lua chon cJc phin lu nhu sau Ic cam bien iSeiiso,-) can su dung cam biSn Ihong so moi tnrirng la nhiet va am, uu ticn su dung cac cam bi6n tich hop (do ca hai dai luang ciing m6i iiic) dc lidi kiem v6 kich thuac Ve mdn hinh LCD hien ihoi la chi cin hi6n thi thai gian (g,6, thang nam) va gia tr, nhict do am lhuc t^ nen c6 the su ii: 151(06): U l - u g dung cac man hinh don gian hien thi hoac'J dong ky tir, Ve khoi lint tnl: de liru trii so Iicu \a then gian vm t£m so llan/'phiil ta cin dune luang cho I lan ghi khoang - byte nen &i luu tru nam so lieu ta can khoang lOMB Dung luong Ion han cac bo nho EEPROM Ihong dung nen ta co the sir dung cac the nha MMC Cac the co kha nang Imt trir dirac dir lieu Ion (co the di dang im 4GB), toe truy cap cao diing d^ Itru trii du Iicu da thai gian dai, Ve tniyen thdng- de dam bao tniydn thong don gian, it phu thuoc vao cac he thong mang CO dinh, ta co the su dung mang GPRS/3G vol mirc phii song rpng, thuan lien cho viec trao doi di"r Iicu Do nhiet va hm moi Inrong bien thicn cham, nen qua trinh Ihu thap du Iicu qua mang khong cin nhanh, chi can khoang phiit cap nhan dtr lieu I lin, Ve may tinh may tinh dd doc, hni tru, giam sal du Iicu thong qua giao dicn nen co Ihc su dung cac may tinh ca nhan thong dung, Khoi dong bo thai gtan Chuyen dimg il^ dong bo cac ket qua vai he th6ng, voi ck thiet bl khac vai thiri gian lhuc nen ta co the sir dung cac IC thoi gian thuc chuyen dung Vl xil- ly trung tdm Cung yen can v^ linh nho gon, da chirc nang, ket ri6i dtrgc vtti cac ngoai VI da neu tren nen ta lua chpn kh6i xu Iy tning tam la PSoC Dong vi xir ly co kha nang sit dung cac kh6i Analog va Digilal VOl cau hinh lap trinh m6m lmh hoat Irong lai nguyen cua PSoC se gnip giam bdt ganh nang phan cimg phia ben ngoai vi xir ly PSoC co thu vien ho tra hau hk cac kh6i chiic nang quan Irpng nhu ADC, giao tifip SPi, giao liiip UART, LCD, Khoi nguon Co nhiem vii cung cap nguoii dam bao hoat dong cho toan bo he Ihong chuyen doi dien ap luoi 220V nguon ap mpi chieu 5V Dong cue dai du kicn la nho hail 50 mA BSVa.BM,»0(e Tap cM KHOA HQC & CONG NGHE L U A C H O N LINH n g N THifer BI VA T H f e T K E PHAN CIING Voi cac ffinh h u m g v j chiic nang ciia thilt bj va linh ki&i nhu a phjn tifci, liong bai bao cac lac gia tea chpn cac thilt bi cy t h i nhu sau: 151(06): 111-118 E C i m U a i a U | t vii tt a m Voi c i c dilu kien lhuc t l hiSn nay, viec thn Ihjp s6 lieu tai cac tram quan trie moi tniong moi ^ dp chinh xac » l nhiet la «).5° va d» i m ±3% nen bai bao de xuat SB dung cam b i l n SHT75 Thuy SI san xuit v4i cac thong s6 phii hpp SHT75 la IC nhiet dp, dp i m tuong d6i, dirpc tich hpp mpt d i u ra, ung dung cua cong ngh? qua ttmh CMOS dam bao dp tm c j y cao va Um viec dai han SHT75 co dp chlnh xac nhiet dp la ±o,3°c va dp i m ±1,8% [5] Ca hai kenh hoat dpng theo nguyen tic cam bien dien dung va dupc Uen k i t voi bang tin hi6u tucmg tu, tin so chuyen d l i 14 bit v4 giao Hip n l i tilp tren ciing mpt chip X •it tt7 ffinh Ddc tinh ldm viic cug SHT75: (a)Boamvd (b) Nhiii dp [5] ffinh Man hinh LCD Hitachi [5] The n h * M M C a) b) Hinh Cam biin SHT75: (g) Hinh dnh, (b) Sa dd kil noi Bing Thang si ky thugt cua SHTJ5 Sai so Saisddo Nguon it$un nhi^dn Giao tiep (V) '/.RBI CO ±1.8 2.4+5.5 Do PSoC ho h o chuin giao tilp voi the nho MMC nen v i n d l n i y co thi dupc thuc hien kha li d l dang Dii li6u Inn v i o the nho duoi dimg FAT32 cho nen hoan toan co thi tiuy xuat bing cac thilt bj khac h5 ttp chuin FAT32 [ I ] Chiic nang c h i n g ghi (Write Protect) va phit hien the {Caril Deled) dupc PSoC he h o mpt cich d i y du The MMC diing ttong d l tai la the nho cua hang Kington voi dong lupng 2GB P/ei"' Sbus So t ^ c tinh Iam viec ciia cam biln S l n S , nhu tiong hinh [5] M i n U n h h i l n flii giao IHID (LCD) Do chi can nhu c i u hiln thi t6i thilu bing cac man hinh LCD v5n ban nen bai bao Iua chpn man hinh LCD cua hang Hitachi (2x16) la m i n hmh hiln thi thang dung Hmh minh hpa m i n hinh LCD thvic t l da chpn ^ ffinh Htnh dnh cua thi nha MMC [11 GPRS IP Model Vdi tin suit khoaiig phut cap nhan dii lieu Ian nen bai b i o de xuit chpn chuin GPRS d l ket noi voi thilt bi tu xa va chon thilt hi F2I03 IP Model F2103 GPRS IP Model (Unh 8) la thiet bj di dpng d i n culi cung d p 113 Do \'an Dmh \d Dig Tap chi KHOA HOC & CONG NGHE giai phap iniyen dir lieu tren mang GPRS;3G thiei bi •iis dung CPU cong nghiep 16'32 bit duac nhung he thong ihcri gian thuc vk duac hd Ira cong RS232 \ a RS485 cho phep nguai dling de dang ket noi vai thiet bi \oi can hinh CO ban Thong so cu ban cua F2103 GPRS IP Model nhu bang [4], I Hinh Giao dien the XIS-IC vd mach ghep noi giao nep the MMC &i PsoC [I] Bang Thdng so cobdn cua F2103 GPRS IP Model Ten CPU PLASH STRAM Ngij(jn cung uap \'o KiL-h ihuoi; Trong iuoTig RS233/RS485,U S422 port SlM,ajlM port Power port Antenna port Nhiet lam vice Do am lam vice Thong so ki' thuat I6 32bil 1MB S12KB DC 5~35V, nguoii chuan I2V0 5A Sal cap bao ve IP30 9U5S5x22mm 20Sg 15KVESDproicciion 151(06) l l l - ] ! Khoi dong bo thoi gian (Realtime) Thiet bl sir dung chip dong ho thoi gian ihirc (RTC - Real-time clock) la IC DSI307 Chip co ghi 8-bit chua thoi gian la giay, phut, gia, thu (trong tuan), ngay, thing, nam [5], Khoi vi xir - ly trung tam PsoC (Programmable System on Chip) (2, 5] Khoi VI xu ly tmng tam ciia thiel bi duoc lira chon la PSoC CYSC29566 cd tai 16 kh6i Digital va 12 khoi Analog co kha nang cau hinh dc tro cac khoi chijc nang phii hop voi yeu cau ciia thiet ke Cac kh6i chiic nang duac ho trg day dii boi phiin mem PSoC Designer ciia hang C \ T R E S S CY8C29566 CO 48 chan co tai 44 chan I'D nhu tren hinh Moi chan 10 co kha nang ket noi tai mgt frong rat nhi6u cac kh6i so va tuong lu ben loi PsoC Dac digm giup ich riit nhieu quy hoach chan di^ ihicl kc mach in, PSoC co bo dao dpng noi tm 24MHz va co bo chia tan so ben giiip cho cac khoi chirc nang ben PSoC co nhieu lira chgn \ e tan so hoal dpng ISKVESDproIecnon Bao ve chong nguoc va quaap Chon.i; sel(oplional) -23^+65^ 95% Hinh Hinh anh ben ngodi cua PSoC CY8C29566 [i] Khoi nguon cung cap Hinh Hinh anh tliiet bi GPRS IP Model F2I03 [4] Tniyen thong may tinh Chuan truyen thong giua thi6t bi va may tinh duoc lua chon la chuan USB ThiSl bi se sir dung mot IC driver PL2302 [5] de d^ng bo chuan UART [2] da duoc tich hgp tren v, xu Iy PsoC \ai chuan USB Vai dong cue dai 50mA ta d6 xuit su dung !C ngu6n LM2576, IC co dai ngu6n d^u vao tir 4V-40V, dong dSu co thi c^p la 3A [5] Tong hgp lai, Ihiet bi bai bao dirac thiet ke voi so nguyen [y nhu hinh KET QUA T H i r c NGHIEM Cac thiet ke tren day da dugc thii nghiem hoan chinh tren cac phSn mim mo phong, cat sa nguyen Iy va thi^I ka mach ciing da dugc hoan thien Thidt bi nho gon, co kich thuoc I0,5t.wx7,5cnix2tm Bo Van Binh va B^ Tup chi KHOA HOC & C N G NGHfi Hinh 10 Hinh dnh cua thiit bi Giao dien ket n6i giiia may tinh voi thiit bi thong qua chuSn GPRS duac t h i hien nhu hinh I I Hinh 11 Giao dien kit ndi giOa mdy tinh vai thiit bi Ket qua doc dii lieu tu thiit h\ len may tinh duoi dang file Microsoft Excel dugc thi hi?n nhu hinh 12 Hinh Sa nguyen ly tdng th4 cua thiit bi do: (a) The nha MMC (b) LCD (c) Dong bo thai gian.(d) Nguon cung cap, (e) Cdm biin SHT75 va kenh dv phdng (f) Khoi USB (g) VXL trung tam Hinh anh thilt bi da dligc thi^t k i va i t p d^t t^i dia diem khac a tinh Hai Duong (Huy4n Thanh Ha, thi xa Chi Linh, huy^n Ninh Giang, Hai Chrang) duoc gioi thi§u tr6n hmh iO Hinh 12 NQI dung aia file Microsoft Excel K i t qua cua thiit bi dugc danh gia, so sanh vm ket qua cac tram quan trie cua tinh Hai Duong, s6 lifiu tren https://yahooweather.com [6] K i t qua so sanh a h u tren bang 3, bang -=?^l Tap chi KHO.* HOC & CONG NGHE Do Vai, Dmh ,d Dig Ban« Bdng so sd nh so heu nine, md, inrong Ngay 1/3/2015 2/3/2015 3/3/2015 4/3/2015 5/3/2015 6/3/2015 7/3/2015 8/3/2015 9/3/2015 10/3/2015 11/3/2015 12/3/2015 13/3/2015 14/3/2015 15/3/2015 16/3/2015 17/3/2015 18/3/2015 19/3/2015 20/3/2015 21/3/2015 22/3/2015 23/3/2015 24/3/2015 25/3/2015 26/3/2015 27/3/2015 28/3/2015 29/3/2015 30/3/2015 31/3/2015 Do tai tram quan trac Tp.Hai Duffne C O Min Ma\ 23 192 199 16 25.7 183 21 18 21 18 22 194 194 17,6 21 173 23 20 23.5 20,4 20,4 18 18 16 19 159 21 185 23 21.4 26 21 23 22 23 22 27 22,8 26 23,5 28 23 25.5 22 26 20,8 23 20 23 20,5 23 18,9 24 195 24,4 20 27 194 27 20,7 29 22 So lieu tren Weather cua valioo com (°C) Max Min 24 19 20 17 25 20 20 18 21 18 21 16 17 16 20 16 21 20 21 18 19 16 17 15 18 15 22 18 25 20 31 24 27 23 29 23 30 24 30 24 26 24 27 23 27 22 25 21 23 19 21 18 22 19 24 20 27 21 29 22 30 23 Do ttr thiet bi dat tai Tp Hai Duomg ("Ct Max Min 23,37 18,03 22 80 17,24 28.94 20,07 21 75 19 00 20,74 19 00 20.34 17 06 19 03 16,53 20,34 17,24 23,42 20.24 21 22 20.42 22,23 16 53 19 60 15 82 19,86 16 97 20 65 18 83 23,99 22,01 26.22 1971 24 82 22 72 26 40 22 63 28.20 23,25 24 51 23,07 26,88 22 90 24,34 21 57 25 52 21,04 23,11 21 04 21 97 19,27 23 55 19,27 23,94 19 45 23 64 20,24 28 33 19 80 27 15 21,04 27 80 22,28 Bang Bang so sdnh so l,eu dd dm md, truang Ngay 1'3/2015 3/2015 3/2015 4/3/2015 5/3/2015 6/3/2015 7'3/20!5 8/3/2015 9/3/2015 10'3/2015 11/3/2015 12./3/201S 13/3/2015 14 3-2015 Do tai tra m quan trac Tp Hal' Duong (•''•) 97 100 100 99 100 100 100 100 99 97 100 100 100 100 70 87 78 71 97 89 98 99 86 83 91 89 99 99 So lieu tren Weatlier ctia valioo o m (•'•) 94 100 100 100 100 100 100 100 64 83 53 60 83 88 88 88 100 100 100 100 100 IOO 94 88 88 77 88 78 Do tir thiet bj dat tai Tp Hai Dutmg C°\ Max 97.79 99 69 99 69 98.74 99,69 99 69 99.69 99 69 98 74 97.79 99 69 99 69 99 69 99 69 Mm 69 26 88.37 69 26 68,30 88 37 94 11 94.11 90 28 89 33 90 28 83.59 80 73 88,37 90,28 Do Van Dinh va j)ig Tjp chl KHOA HOC & C O N G N H $ Do t^i tr^iD qnan t r i e Tp.HiiDmnig|*l Ngiy 15/3/2015 16/3/2015 17/3/2015 18/3/201S 19/3/2015 20/3/2015 21/3/2015 22/3/2015 23/3/2015 24/3/2015 25/3/2015 26/3/2015 27/3/2015 28/3/2015 29/3/2015 30/3/201S 31/3/2015 100 100 98 97 97 IOO 100 IOO 99 96 96 97 100 IOO 87 95 78 78 67 80 69 87 78 70 76 78 64 73 So lieu treo Weather cna yahoo 100 100 100 94 94 94 94 94 94 94 94 100 IOO 94 89 94 78 77 74 66 62 66 78 70 61 78 88 73 78 73 65 62 58 151(06): 111-118 Do tir thiet bi dat t^i Tp HiiiDir(nig'('^) 99.69 98.74 99.69 99.69 96.84 96.84 95.89 97.79 98.74 99.69 97.79 95.89 97.31 99.69 97.79 94.94 98.74 92.19 84.84 86.46 91.24 75.95 73.08 68.30 79.77 67.35 81.68 80.73 73.08 79.77 77.86 63.53 67.35 68.00 m n h 13 Do thi biiu dien sS h^u gid tri nhiit dp dm Bftng H4 so tuang quan sai so trung binh tuy^t ddi giQa kit qud c vdi tram quan trdc dich vu mang Ngn&n s6 ligu Thjgt bi Jo H? so tuong quan (r) lai so tnmg blnh tuy^t doi fMAE) Tram quan trie Tp Hii Dinmg Nhift Nhift DpInT Dfai d$ max d8 max 0.91 0.71 Nhift Yahooweatber.coni Nhift Bglm dfu 0.91 0.76 97 3.32 TO bang va hinh 13 cho thiy kit qua tu thiit hi luon bam theo cac gia tri cua hai nguon so h ^ u : t u t r m quan trac, tus61i?u tai tai cac cac dich dich vu vu mang mang (yahooweather.com) ' Tuy nhien v5n c6 sv khac bi?t giua ba ngu6n s6 lieu; tii tram quan tr3r tr5c hr tii cac s6 lieu tai cac dich vy nmng va t i so lieu tn;c d i p dac biet la sai s6 trung binh tuyet d6i (do am min) Diiu cho thSy ta tiip ^ c can pha, xac dmh nguon sai lech giua cac m6 hinh d i tu lua chpn ngu6n s6 lieu phu hpp (at«t dt^ pht^gphap hieu chinh so li$u aia cdc nguSn nhSm htrong tai kit ( qud cfiinn xac hem) Di\auBmbvdDig Tap chi KHO.A HOC & CONG NGHE 151(06) l l l - | | g KET LUAN VA HUCiNG P H T TRIEN s6 lien chudn d i dua dugc phurnig phap Bil! bao da trinh bay \ i mot thiit k i mach do, thu thap va giam sat mot s6 thong s6 raoi hieu chinh so lieu ciia thiet bi n h ^ huong tcri ket qua chinh xac hoTi, tnrong qua mang di dong GPRS/3G Thiet bi da ducrc tnin khai va l4p dat a khu -vuc tinh Hai Durnig, va buac d k cho kit qua chinh xac va dat duac nhirng veu clu d i nhu: do, , , , , : , ,.-, doc, iuu tru, canh bao va aiam sat du heu, Dir kien phat tnen thiet bi then gian toi, Phat tnen thiil bi da nang, co kha nang diroc nhiiu thona s6 moi tnicmg khac nhu CO,, NO,, SO,? bui, : Xac dmh ngu6n T A I LIEU THAM K H A O '• MultiMediacard datasheet ^ Datasheet; MAX 232, UART SPL ADC PGA, PSoCDesigner 5, , CjTiress Microsystem , ^• -t.^'.nr^,- _• , ^ J CY8C295663 datasheet, C>press MicroSyslem httpV/konvcrter hu/leto]tes/T2l03%20GPRS%3 0IP%20MODEM%20SPECrF[CAT!ON pdf ^ www.datasheetarchive com ^ httpsV/weather yahoo.com SUMMARY A PROPOSED DESIGN O F AN I N S T R U M E N T F O R DATA C O L L E C T I O N AND M O N I T O R I N G SELECTED E N V I R O M E N T A L P A R A M E T E R S Do Van Dinh'', Dinh Van Nhuong^ Tran Hoai Linh' 'Hanoi Universitv ofScience and Technolog] 'Sao Do University This paper presents the design ol" a device to measure, collect data to monitor a number af cn\ironmenIaI parameters to assist in reading, recording, stonng and analyzmg of data The device IS designed wnh high accuracy, easy lo use, while collected data are automatically saved to Ihe MMC memory card Periodically, the dala are sent back to the servers via GPRS/3G networics Additionally, users are allowed to set up the parameters for the data collection such as sampling period, low memory warning, and device status access via SMS The device has been manufactured and instances are installed at several locations in the province of Hai Duong for measuring, collecting and monitoring of temperature, relative humidity in the region where Ihere are nol monitonng stations before Measurement results form lhe basis to build forecast models of environmental parameters With the tests performed, the device gave good results Keywords: Instrument, collecti : monitoring, parameter, environment' temperature, relative hum idlly mjshmlwc TS Truong Tua, Ani, ^ Tnrdng Da, hoc Kf thud, Cdng nglnep - DHTN ^'••m'S!",m.E„„ja.,,.h-.i.^g„„„ ... % a am moi Iruong \ '' a i muc dich xay dung ihiet bi nho gon thuan tien cho vice su dung, CO the chinh \ a c thong so moi truang thu thap so heu \ a giam sal qua mang Thi^t bl dugc thiet ke \-cri... bl nho gpn ''an hanh, su dung thiet bi don gian, thuan tien thong qua giao dien, Co kha nang lmi trir gia tri nliiet do am dong bo theo thai gian thuc ''a hen tuc vai chu ky phiiL''lan thm gian... tniyen thdng- de dam bao tniydn thong don gian, it phu thuoc vao cac he thong mang CO dinh, ta co the su dung mang GPRS/3G vol mirc phii song rpng, thuan lien cho viec trao doi di"r Iicu Do nhiet va
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