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Forum Elektroniczne • podpięcie układów do LPT PC
Strona 1 z 1

podpięcie układów do LPT PC

: pt 26 maja 2006, 11:24
autor: xfoton
Witam,
Zamieściłem pytanie już na jednym forum, ale nikt mi nie odpowiedział.Tak trafiłem mu - to mój pierwszy post.

Wymyśliłem coś takiego:



i nie wiem czy dobrze...

Sterowanie przez program przy pomocy portu drukarki LPT. Na początku sygnał z danych D0…D7 jest wzmacniany przez bufor 74245: Enabla=0 (czyli że układ jest aktywny) i DIR=0 czyli kierunek transmisji od A do B. Następnie pięć lini na wejścia UDN2981, a dwa na wejścia rejestru 74164 (CL i połączone AB). Teraz UDN steruje pluskami diod, a rejestr minusikami. Zasilanie 5V, zaznaczone na schemacie. Jak coś jest jeszcze niejasne to napiszę.
Wiem, że to bez sensu idea, ale to jest uproszczenia i chodzi mi o sprawdzenia sensu (sterowanie multiplekserowe, właściwie będę sterował czterema kostkami LED 7x5).
To ważne, bo to mi da na 100% cel z infy :lol: , a na koniec gimnazjum się bardzo przyda. Bardzo dziękuje za pomoc.

: pt 26 maja 2006, 17:13
autor: movzx
Ma szanse dzialac, ale skoro juz bawimy sie "wymyslnymi" sposobami sterowania (8 LEDow mozna wysterowac zwyklym ULN2803), to proponuje
74259 albo 74573. Pierwszy z nich to adresowalny 8-bit zatrzask, drugi to zwykly transparentny zatrzask.
Mozna tez dodatkowo wykorzystac kilka linii sterujacych portu (np. -STROBE i -RESET).
Jakby byl problem z "rozgryzieniem" tych ukladow, moze uda mi sie popelnic jakis schemat...
Pozdr.

: pt 26 maja 2006, 20:37
autor: xfoton

: pt 26 maja 2006, 21:33
autor: movzx