LI NI M U

Ngy nay, cng vi s tin b khng ngng ca khoa hc k thut, cng ngh in t , ang v s pht trin ngy cng rng ri c bit l trong lp trnh vi x l v k thut s. Mch s c ng dng rt nhiu trong k thut cng nh trong i sng x hi nh ng h s, mch m sn phm, mch o nhit Phc v cho vic thc hnh mn ocard ,thit k mch in t,nhm em xin lm mch m sn phm hin th 2 led 7 thanh dng vi iu khin 89c51

V kin thc v thi gian hn ch, kinh nghim cn yu nn n khng trnh c sai st, rt mong s tn tnh nh gi ca Thy C v gp ca cc bn sinh vin. Em xin cm n Ban Gim Hiu v cc thy c Trng i Hc Cng Nghip H Ni tn tnh ging dy chng em trong thi gian qua.

Trong qu trnh thc hin n mn hc, em xin chn thnh cm n thy

TRN QUANG VIT- gio vin b mn,

cc bn trong lp trao i, gp , gip em hon thnh n mn hc ny. Em xin chn thnh cm n.

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PHN 1: KHI QUT V CU TO MCH

y l mch m sn phm dng vi iu khin 89c51 thuc h mcs-51 ca Atmel,kt hp vi mch thu pht hng ngoi s dng OA thut ton LM358. Ic 89c51 l b vi iu khin c 128 byte RAM,4 kbyte ROM,hai b nh thi,mt cng ni tip v bn cng vo ra..

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S chn ca 89c51

IC LM 358 l OA thut ton vi 2 b OA bn trong.lm358 c tc dungjso snh mc in p gia hai chn u vo pht xung u ra..

S chn LM358:

PHN 2 :NGUYN L HOT NG CA MCH

Cm bin hng ngoi (IR sensor) c dng kh ph bin trong cc ng dng thc t.ty tng ng dng khach nhau m ngi ta c th dng k thut khuch i,iu ch in... nng cao nhy tin cy ca cm bin.Trong khun kh hiu bit em xin lm mch in n gin dng cm bin hng ngoi.

B khuch i thut ton lm vic nhu mt b so snh,bin tr 10k c chc nng iu khin in p ngng so snh.Mi khi c nt vt th i qua tc l c s cho khut tia hng ngoi t diode pht sang photo-transistor dn n chuyn t muacs in p 1 sang 0 u ra ca b khuch i thut ton gy ra ngt ngoi INT1.

Chng trnh lm vic ca 89c51: //mch m sn phm #include"reg52.h" //================ sbit Led1 = P0^0; sbit Led2 = P0^1; //================= unsigned char M[10]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0 x80,0x90}; int x=0; void delay(unsigned int t) { unsigned int i; for(i=0;i