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Author Topic: puerta con clave de seguridad  (Read 1321 times)
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duque528
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« Reply #15 on: September 25, 2011, 12:07:09 pm »
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Si usamos el 74c922 podriamos ahorrar algunos pines y algo de programacion.

http://www.datasheetcatalog.org/datasheets/120/243040_DS.pdf
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yOPERO
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« Reply #16 on: September 25, 2011, 02:09:13 pm »
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Teclado numerico usando solo un pin de Arduino

http://txapuzas.blogspot.com/2010/09/papertecladorc-varios-pulsadores.html
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