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TRNG I HC GIAO THNG VN TI THNH PH H CH MINHNhm 8: L Vn DngNguyn nh PhcV Thi VinhNguyn Vn V Mn hc: O LNG IN TGing vin: L XUN KBi tp:Thit k mch o dng DCDV 11DV 11

DV 11DV 11121. Yu cu bi tp.o dng in DC hin th ra led 7 on.Dng ti a o c l 10A.Tm o: + Tm o 1: 0 250mA.+ Tm o 2: 0 2.5A.+ Tm o 3: 0 10A.2** Cc phng php o dng in DC.+ Phng php o trc tip : dng cc dng c o in nh: Ampemet, Miliampemet v..v+ Phng php o gin tip: dng volmet o in p ri trn mt in tr mu, thng qua tnh ton s c i lng in cn o.+ Phng php o so snh: So dng cn o vi dng in mu, chnh xc.** Chn phng php o. Phng php o gin tip. - Do gin tip dng in thng qua in tr, s dng vi iu khin hin th ln led 7 on.- Phng php ph hp vi yu cu ca bi tp.- C cu o v hin th d dng, chnh xc cao.42. S khi.5Khi ADCChuyn d liu tng t sang sKhi x l8051 Khi hin th (led 7 on)Khi ngun(5V)Khi chn tm o3.Linh kin s dng.61. Khi x l.(AT89C52)Hnh dng AT89C52

* AT89C52.7

Cng Port 0 (cc chn 3239): L cng vo/ra song song c hai chc nng.Cng Port 1 (cc chn 18): L cng vo/ra song song, c th dng cho giao tip vi cc thit b.Cng Port 2 (cc chn 2128): L mt cng vo/ra song song c tc dng kp, c dng nh cc ng xut nhp hoc l byte ca bus a ch Cng Port 3 (cc chn 1017): L cng vo/ra song song c tc dng kp. Khi khng hot ng xut nhp cc chn ca cng ny c nhiu chc nng ring

3.Linh kin s dng.8*Khi ADC 0804

Chip ADC0804 l b chuyn i tng t s thuc h ADC800 . - p nui +5V - phn gii 8 bit - Thi gian chuyn i: khng b hn 110us.9CS (Chip select): Chn s 1, u vo tch cc mc thp c s dng kch hot Chip ADC0804. RD (Read): Chn s 2, Chn RD c s dng cho php a d liu c chyn i ti u ra ca ADC0804.WR (Write): Chn s 3, l chn vo tch cc mc thp c dng bo cho ADC bit bt u qu trnh chuyn i. CLK IN v CLK R: CLK IN (chn s 4), l chn vo ni ti ng h ngoi c s dng to thi gian.Ngt INTR (Interupt): Chn s 5, l chn ra tch cc mc thp, bo cho CPU bit l d liu chuyn i sn sng ly i.Vin (+) v Vin (-): Chn s 6 v chn s 7.Vcc: Chn s 20, l chn ngun nui +5VVref/2: Chn s 9, l chn in p u vo c dng lm in p tham chiu*S chn ADC0804*Khi hin th: Led 7 on.3.Linh kin s dng.

4.S gii thut chng trnh chnh.BeginChn tm oADC nhn d liu v chuyn iVDK c d liu t ADC, tnh ton.Hin th kt qu ra led 7 onEndyesNo6.M phng