. Dieing 4: Sink E F T, tong PA= 5, thng
c)Canh bao "Low Battery"
C6 nhieu tin hieu citnh bao nguan duqc trio ra, n6 phai five tiep tac dOng toi ngutri sir dung de quitn ly thc hog dung ctia ngu6n. Ck bieu ttrqng quen thuec ve tin hieu dirt bao ngu6n thip (low battery) duqc thiy tren camera, cell phone va cdc PDA c6 the duqc su dung trong citc ling dung nhu nguyen 19 may tinh ca than !thong day (wrireless PC) nai ma ngubi sir dung chb de thiy cac tin hieu earth Mo. Chit y ring ngtrai s* dung c6 the Op nhieu vin de a the node mang khong duqc hien thi va nhitng nai khd de quan 19. Thutmg thi birc dien cash bao duqc gui luftn phien thong qua mang cam bien toi met node dang chay cic tien ich trang thai mang.
Met tien ich trang thai mang Ia met ceng nai ma ngutri so dung c6 the quart 19
tang thai ctia mpg. Phu thuOc vao the img dung, tien ich tang thai mang c6 the la: —Met xir ly nen chay tren met node mpg;
—MOt xir lY dang chay tren phin chuyen dung curt phin cling (nhu lit Laptop hoc PDA) duqc djnh Icy truy nhop vao mang;
— MOt xir 19 dang chay tai ceng node manenku c6), 6 day ngtrOi sir dung c6 the truy cep cac tien ich thong qua mang Internet.
Trong nhieu ck ling dung, tien ich tang thai mang la van de then St guy& (firth t6i thank c8ng cua viec thiet ke mpg. M#c du riming c6 the ttr to chirc va to von hanh nhung ngutri sir dung met mang Ion vin phai chic chin mang dam bao cac chirc rang ctla n6. Han nita trong nhieu cdc ling dung d(ic biet trong tnrOng hqp khtm cap trang thai mpg phiti frau dung.
Neu thrill bao nguem thip duqc girl th8ng qua chinh mang cam bien, thi node mang phiti duqc thiet ke de chirc Wing thu phat la chirc rang sau ding trong cdc dieu khien. Con ck chirc Wing khac curt node nhu sur von hanh Sensor, Actuators va giao dien ngtrOi sir dung phiti chip nhon sir dung nguon thip de dam bito cho chic fling truyen nh(in duqc thuc hien va tin hieu earth bao ngu6n thip duqc girl.
Cac nguyen 19 thiet ke node mang cam bien di node c6 kha nang dieu hoa ngu6n thip:
— Node mang chi gfri birc dien "thay d6i twig thin" don thi vi tri trtmg tam chi khi nao citnh bao ngu6n thip duqc thief lop. Nguyen 19 nay toi uu hod vao tau
—Node mong ce the girl birc dien "cop nhot trong thai mong" mOt cacti dinh lct t6i g6c mpg. M5c dfr nguyen 19 My lam dai birc dien van hinh mang nhung no cung cap thong tin quan tong tea ngutri sir dung;
—Neu mang Ichang h6 trq birc dien "Op nh#t tong thai mpg", node c6 the chia se thong tin trong thai nguan tai tit ca cac node Ian con. Node nay c6 the tri
loi cac truy van lien quan toi trong thai cos ne neu ne ce the thoc hien dtroc dieu My. Khi nguen cfra ne hong cac node lin Om se thong bao cho mong 13% do node hong.
2.4.2. TO dyng cdc nguAn tang hipng trong 4r nisi&
Trong nhieu throng hqp, viec liy rding luong ttpc tiep tfr mei throng ce the dam bio cho viec vOn hinh cac node mang dun Bien. Nang luqng nay ngtrtri to goi la Ming luqng sach vi thuet ngtt "energy scavenging" bao gam quang Ong, dung nang vi cac nguan &mg luqng khac.
Clic node mang tan dung ning luqng sach duqc goi la "live off the land" de thay the cho nguen nang luqng sir dtmg Uri chinh n6. Neu duqc thiet ke hop 1y cac node mang sir dung nang Itrotng sach c6 the rat nhe b6i chfrng kh8ng con mang theo ngu6n chira nang bong. Nguan nang luqng duqc liy tfr m8i throng c6 bien dOng tit len vi chimg c6 the duqc ngit trong qua frith hoot dOng. Thong thurtmg viec ngit ngu6n se duqc do down truttc, nhu la viec thay dal chu Ick ctia duet bj chuyen ding. Trong trulmg hqp khac viec ngit ngu6n la do str c6, do de do bao thong ke thutmg duqc stt dung. Xac suit nguen ngtrng hoot dOng la rit Ian b?ri vi cong suit tir meri trutmg dti cho vOn hinh Wong the dam bao 6 tit a thfri gian. Do de ngutri thiet ke phiti chip mOt mirc dO tin cOy doc tren cic kieu nguan nang luqng sach khac nhau vi thiet ke node mang phi hqp v6i you du.
Vi du, viec danh gii he thong nang luqng m*t trOi phiti de cop den hieu (mg gi6i hart thfri gian chieu sang. Viec thiet ke phai h6 trq cho so v#n hinh ban dem hay nhang Mc Ichong c6 anti sang. Hon nita viec thiet ke cling phai chit Sr den vi tri ctia cic mien vimg khac nhau, b6i vi thin fiat Ichl hOu vi thin gian chieu sang ctia mkt trfri 6 the yang khac nhau la khac nhau. Do d6 ngubi thiet ke phai dam bio mOt mirc dO tin coy Mira tren dos tren dO khi dung ctia mOt ten 6 vi tri thiet ke.
MOt d#c diem chung curt hAu ha cac ngu6n nang Itrong &Itch la can suit trung birth thip chi khoing 1mW hoOc thip han. Mac di cong suit trung birth can cho node mang cam bien c6 the thip han cong suit trung birth cos ngu6n Ming luqng sach nhung cong suit dinh can cho node mang thi luton len han cong suit tirc thoi nh6 nhit cung cap bei ngu6n.
De dap (mg yeu cau cong suit dish nay va de hO trq sv bien dOng diu ra ciut cac
nguOn ning lutyng such. Hiu hit cac ngu6n nAng luqng such phai co much dieu holt cling suit. Much &Au hoa cling suit at gifta ngutin cling suit va tai de dim bao phis hqp gifts (long va dien ap tui dau ra ctia ne thich hqp vai yeu ciu cila tai. DOng thbi phai phil hqp dang va tai you c.Au tai dau vao curt nguOn. Hiu het cac much dieu hoa ding suit you cau mOt phin til luu tra Ming luqng thir cap, thong thubng la nguen thin cap hoac tv dien. Ve ban chit ngu6n nang Itrang such la nhftng clang chay !the nap cho thiet bj luu trlt thin cip a dAy Ming luqng duqc chuyin tai node mang. NguOn nting Wang thin cap ce met dO Wing luqng 16n han so yeti tv dien, do de chiing c6 the ding suit alit cao han trong chu kt dlti han. Tuy nhien chiing cling c6 tec dO nap lai cao km nen lam tAng sv tieu the cling suit trung birth. Tut thuOc vao sv chon Iva deg nglie, qua trinh chuyen dei dien ap c6 the duqc thvc hien fruit hoec thiet bj luu frit thin cap, hoc sau thiet N nay hoec la ca fruit va sau ho#c la kh8ng.
MOt nhan t6 duqc de cep trong suit qua frith thief ke he thong cung clip Wing lucmg such la cach th0c thvc hien bet va tit nguOn. Tai thin diem bet, thiet bj luu tra thin cap c6 the dang duqc nap vi vey much dieu hoa ding suit se khan the cung clip cho tai cho tOi thbi diem Si ciut qua trinh nap. DAy la mot Idt6 khAn b6i vi much dieu hoa cling suit khOng c6 ho#c kh8ng du dau ra trong suet thin gian nay, mach diet' Ithien phat hien ra dieu kien khei dOng va giitm sit 'rung thai nap cua thiet N km trCt thir cap va cu6i cang ket nei tai toi dau ra cos manh dieu holt ding suit. Nguan cling suit such ce the ce ac firth bien dOng Ian vi vey viec thitt ke cac much dieu Ichien g#p phai thach that 16n. Hon nits, chting can phai ditm bao cung cap du fling limn cho node mang host dOng ngay ca khi nguon nAng luqng such tom thin gian (bun.
Much Idled dOng phai kitting gAy anti huimg tel chirc Tian dieu holt node cho tel khi viec dieu hol duqc phat hien. DE civic thing tit nguOn ctia h'O thOng c6 the duqc thvc hien trong khi nAng luqng yin khi dung trong thiet N luu trOr thin cap. Neu nAng luqng such duqc sir dvng trvc titp cho viec von Minh khi da mOt mOt nguOn nhd co the duqc thvc hien de cung cap mach dieu khien.