HIN THLCD 16X2

M HNCM BIN NHIT THERMOCOUPLE - J

CUN DY GIA NHIT

CHNH NHITVOLUM 2K

KHI NGUNBIN P220V 12V4A

CU DIODE 12V -4AN P 5V

LC NHIU

KHI M DNGPNP + IRF Z44

CHUYN I NHIT VI MCH AD594

IU KHIN TRUNG TMC ADC 10 BITIU XUNG PWM 10KHZ

IU KHIN LCD

S khi trm hn iu chnh nhit Ch thch: Tn hiu iu khin: ng ngun cung cp:

PHN TCH v TNG HP :1. M hn: M hn c nhiu loi: - M hn 220VAC khng c cm bin bn trong. - M hn 12VDC c cm bin o nhit bn trong. c th iu khin thng qua PWM ca vi iu khin chn m hn 12VDC c cm bin o nhit bn trong. Thc t c m hn nhn hiu Hakko rt c a chung. Cm bin nhit bn trong l loi Thermocouple ( cp nhit in loi J ) c di nhit o c rt rng, maximum ln ti gn 2000 C.2) Vi iu khin: - H 89: 89c51, 89c52, 89s52, 89s52, 89v51 - H avr: atmega8, atmega16, atmega32, atiny - H pic: 16f887a, 16f877, 16f4550, 16f4520Dng pic v kh nng chng xung nhiu t bn ngoi, c sn PWM v gi r hn AVR. C th th xi 16F887 v qu quen thuc.3) Hin th:- LED 7 on- LCDDng LCD cho thoi mi v d iu khin, hin th c nhiu k t hn, mch gn hn. C th l LCD 16x2.4) c nhit :- a u ra cp nhit in vo khi khuch i p ri a vo khi so snh bit nhit .- Dng vi mch AD594 chuyn in p u ra cp nhit in thnh di in p analog. Mi in p u ra ( c mV ) tng ng vi 1 nhit . Dng khi ADC sn c trong vi iu khin nhn v tnh ton nhit .Dng AD594 mch gn, n gin khu tnh ton.5) iu chnh nhit mong mun:- Nt nhn 2 trng thi.- Bin tr volum 3 chn, u ra in p thay i theo mc chnh bng tay.Chn Volum vic iu chnh n gin v nhanh chng. Dng ADC ca vi iu khin c mc iu chnh.6) m cng sut cp cho ti m hn:- R le 5 chn.- Kt hp transistor PNP v Mosfet knh N.Dng PNP v FET v in p 12VDC v dng 4A tr xung th IRF Z44 chu dng thoi mi. C828 m m cho Z44. Trong khi xung PWM lm ng ngt lin tc r le th ku n, sinh nhiu v dng lu di s khng bn vi tip im.7) Khi ngun:- Acquy 12V - Bin p kt hp cu diode, n p DC, t lc nhiu.Chn bin p v kh nng ti ln, gn gng cho thit b. Trong khi dng c quy th b thit b cng knh hn, dung lng c quy cng l vn quan trng cho thi gian s dng trm hn. BIN LUN: Mc d ti u trong phn tng hp nhng sn phm khng th hon ho c. Tt nhin ti u ri th u im s nhiu hn nhc im. Sau y l mt s nhc im. - V s dng bin p nn nu mt in s khng hn c, kh nng di chuyn khng cao nu nh lm vic nhng a im khng c ngun in dn dng hoc xa ngun in dn dng. - AD594 kh tm mua. - 16f887 vn c gi khng h thp nu i tng l sinh vin hc sinh. -