Zapínání a vypínaní jedním tlačítkem

2. května 2010 v 17:48 | Vlado |  Výtvory
Vypínání a zapínání jedním tlačítkem
Jistě máte na většině domácích spotřebičů vypínaní a zapínaní jedním tlačítkem. Samotné tlačítko (dvoupolohové) se dá sehnat, ale chce to štěstí J. Znám jedno řešení pomocí "jednopolohové tlačítka" (funguje např. jako tlačítko na klávesnici). V obvodu je zapojena 555tka, která zde plní důležitou překlápěcí úlohu (bistabilní klopný obvod) . Na výstupu nulování 555tky a plus pólu baterii se při sepnutí
objeví napětí (na nulování je záporný potenciál). Při opakovaném sepnutí se potenciál nulování změní na kladný. Napětí lze tedy využít ke spínání relé, ke spínání svítivek … Napětí při napájení 9V je asi 3.5V proud podle odhadu max. 100mA. Jistě se dá najít vhodné relé k tomuhle schématu.


Obvod musí být neustále napájen. Při odpojení napájení a opakovaném připojení zdroje k obvodu se 555tka resetuje čili si nepamatuje poslední stav (ZAP/VYP), ale překlopí se do ZAP. Celkový obvod je velmi jednoduchý, při pečlivém navržení desky vše musí fungovat na 100%, obvod lze napájet i 12V (teoreticky by se měl i znatelně zvednou rozdíl potenciálů=NAPĚTÍ   mezi
nulování a plus pólem baterie) . Větší napájení než 12V však nedoporučuju, obvod jsem opatřil i DIODOU, jako ochranu proti přepólování-(1N4007).
Tenhle obvod je jakoby elementární pamět logické 1 či 0 , budu vytvářet pamět která si bude pamatovat např. čislo 5, později vše popíšu a nafotím.
monos


Budete potřebovat:
Rezistory:
100K, 180R, a dvakrát 8K2 (obyč. )
Kondenzátor 100nF (keramika)
Integrovaný obvod: NE 555
Diodu: 1N4007

Jakoukoliv LED DIODU: Třeba supersítivku 3mm

Tlačítko: takové, které při stlačení je sepnuté a při puštění se vrátí do vypnuté polohy.

Moje schéma je s LED a předřadným odporem,
při použití relé odpor 180R nepoužívejte.
zu

Zapnuto
ztžžý

Vypnuto
                               Obovd lze sestrojit do 50Kč včetně baterie.
 

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