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Pantalla con matriz de leds.


witsuk's picture

By witsuk - Posted on 21 February 2009

 


 

Investigando en la red, sobre el tema de pantallas con leds, encontré una página donde explicancomo hacer una pantalla con leds. Así que para todos aquellos que han tenido varias dudas sobre este tema, ojalá les pueda servir para realizar sus proyectos.


 

"La gran mayoría de los aficionados a la electrónica, tarde o temprano, se propone la construcción de un cartel basado en una matriz de diodos LEDs. El propósito de este artículo es explicar, de forma clara y sencilla, la forma de hacerlo.

A lo largo de estos parrafos veremos la forma de abordar el problema, y el principio de funcionamiento de una matriz de LEDs de un tamaño cualquiera. No construiremos ni programaremos una, pero si veremos como se debe hacer. Si el lector necesita un proyecto de este tipo listo para usar, puede consultar los que se listan al final de este artículo.

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¿Cómo funciona la matriz?

Como dijimos antes, la pantalla está formada por una serie de filas y columnas. La intersección entre ambas contiene un LED. Para que este encienda, tiene que recibir simultáneamente un “0” en la fila, y un “1” en la columna. Cuando se dan estas condiciones, la electrónica de la placa se encarga del encendido del LED en cuestión. La forma de generar un mensaje sobre el display es relativamente sencilla, si nos atenemos al siguiente algoritmo:


1) Apagar todas las filas.

2) Escribir los valores correspondientes a la primer fila en el registro de desplazamiento, teniendo en cuenta que el primer digito binario colocado corresponde al último LED de la fila, y el ultimo en poner al de la primer columna.

3) Encenderla primer fila, esperar un tiempo, y volver a apagarla.

4) Repetir los pasos 2 y 3 para las filas restantes.

"


 

Para ver la página click aqui...

 

 


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