Connect 10 multiplexed led to PIC16F819

[zanor]

Hi!

Could anyone please tell me how to connect **broken link removed** to a PIC16F819.

I want to be able to control all the LED's by software.

Any help would be great!

 

[jsm]

Connect pins 1-5 to a general purpose I/O pin, and pins 6-9 to a current limiting resistor and the other end of current limiting resistor to a general purpose I/O pin on the processor. Now when you apply a 1 (or high) to pins 6-9 and a 0 (or low) to pins 1-5 the appropriate led will light. To light all of them simultaneously you will have to multiplex them. Since you have 5 banks of 4 LED's you will have to set the LED's you want on in each bank in sequence, and leave each bank lit for a fixed amount of time. A good rule of thumb is to sequnce such that all LED's are scanned in around 16 mS so with 5 banks each bank should be lit for 3-4 mS.

 

[ateym]

hi,
try following code.
you can see complette project in
attached file
Regards
Ali Asker


//Ali Asker
//2006
//is is designed for edaboard
#include<16f74.h>
#fuses XT,PUT,NOWDT
#use delay(clock=4000000 )
#byte port_a=5
#byte port_b=6
byte const table[4]={0b00000001,
0b00000010,
0b00000100,
0b00001000
};
byte const table2[5]={
0b00011110,
0b00011101,
0b00011011,
0b00010111,
0b00001111
};
main()
{
int i,j=0;
set_tris_a(0x00);
set_tris_b(0x00);

port_a=0;
port_b=0x1f;
for(;
{
for(i=0;i<4;i++)
{
port_a=table;
for(j=0;j<5;j++)
{

port_b=table2[j];
delay_ms(500);

}

}
i=j=1;
port_a=0,
port_b=0;


}

}

 

[ateym]

sorry,there is a mistake in my code
cahnge
#include<16f74.h>
with
#include<16f84a.h>