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how to interface 5x7 matrix led with 8051

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Rubina_pinto

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I am learning 8051 & have interfaced it with leds, lcd, 7 segment leds,etc
I am trying to interface it with a 5x7 matrix led display and soon if successful would go ahead with 8x8 matrix led interfacin also. I tried some bit of coding, am not getting errors but am not getting my required o/p either.
I am using Keil as my compiler & Proteus as my simulator
I want to display alphebets A to Z on it with some delay. also let me know the connections.

here's my code

Code C - [expand]
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#include <reg51.h>
 
unsigned char code LED_Alphabets[130]={
0x7e, 0X09, 0X09, 0X09, 0x7e, // A
0x7f, 0X49, 0X49, 0X49, 0X36, // B
0x3e, 0X41, 0X41, 0X41, 0X22,
0x7f, 0X41, 0X41,0X22, 0x1c,
0x7f, 0X49, 0X49, 0X49, 0X63,
0x7f, 0X09, 0X09, 0X09, 0X01,
0x3e, 0X41, 0X41, 0X49, 0x7a,
0x7f, 0X08, 0X08, 0X08, 0x7f,
0X00, 0X41, 0x7f, 0X41, 0X00, // I
0X20, 0X40, 0X41, 0x3f, 0X01,
0X7f, 0X08, 0X14, 0X22, 0X41,
0x7f, 0X40, 0X40, 0X40, 0X60,
0x7f, 0X02, 0X04, 0X02, 0x7f,
0x7f, 0X04, 0X08, 0X10, 0x7f,
0x3e, 0X41, 0X41, 0X41, 0x3e,
0x7f, 0X09, 0X09, 0X09, 0X06,
0x3e, 0X41, 0X51, 0X21, 0x5e,
0x7f, 0X09, 0X19, 0X29, 0X46,
0X46, 0X49, 0X49, 0X49, 0X31, // S
0X01, 0X01, 0x7f, 0X01, 0X01,
0x3f, 0X40, 0X40, 0X40, 0x3f,
0x1f, 0X20, 0X40, 0X20, 0x1f,
0x3f, 0X40, 0X30, 0X40, 0x3f,
0X63, 0X14, 0X08, 0X14, 0X63,
0X07, 0X08, 070, 0X08, 0X07,
0X61, 0X51, 0X49, 0X45, 0X43 // Z
};
unsigned int LED;
int i;
 
void main()
{
P2=0;
P0=0;
for(;;)
{ 
//P0=~LED_Alphabets[LED];
P2=~LED_Alphabets[LED];
 
for(i=0;i<2500;i++)
{
for(i=0;i<30000;i++);
 
}
LED++;
 
if(LED==25) 
LED=0;
} 
}

 
Last edited by a moderator:

@Rubina,

Read **broken link removed**, maybe useful.
 

@Rubina,

Read **broken link removed**, maybe useful.

Thanx for the pdf Erwin, but the version which I am using doesn't support AT89S52, I'l surely try ur idea once I get clear with a simple 5x7 matrix led application!
 

805X, 89C5X, 89S5X to many similar features in the architecture and instruction. It becomes possible for the 8051 designer to directly start using 89C5X or 89S5X, or vice versa.
 

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