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Sokol fórum • Zobrazit téma - Parport/Paralelní port/LPT

Parport/Paralelní port/LPT

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Parport/Paralelní port/LPT

Příspěvekod raptor483 » 18 led 2009 18:31

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Re: Parport/Paralelní port/LPT

Příspěvekod raptor483 » 19 led 2009 11:50


Program cyklicky mění adresu demultiplexoru a podle znaku který se má zobrazovat mění úroveň na gate vstupu. Displeji stačí jeden odpor, protože přes něj teče pořád stejný proud (proud jednou diodou vybranou demuxem nebo žádný, když segment nesvítí). Můžeme počítat s vyšším proudem segmenty, protože diody blikají s velmi malou střídou 1/16. Je dobré, aby celý cykl 16-ti adres probíhal alespoň 50x za sekundu, aby nebylo znát blikání.
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