Hi,

You can display HR:MM:SECONDS using three multiplexed 7 segment display. It seems you have to make minor changes in code. Can you please post the code that you have used?

Thank u .Pls find the code bellow.

 // Program to make a clock with time setting functionality.

#include<reg51.h>

sbit dig_ctrl_4=P1^0;        //Declare the control pins of the seven segment

sbit dig_ctrl_3=P1^1;

sbit dig_ctrl_2=P1^2;

sbit dig_ctrl_1=P1^3;

sbit reset=P1^4;        // Reset pin to reset the clock.

sbit start=P1^7;        //Start pin to start the clock after the time is set.

sbit incr=P1^6;        //Increment pin to increase the digits during time setting.

sbit set=P1^5;        // Set pin to set the time.

int sel_seg_to_incr=0;

int ret_seg_to_incre=0;

int recnt_incr_seg;

unsigned char dig_disp=0;

int min2=0;

int min1=0;

int sec2=0;

int sec1=0;

char dig_val[10]={0x40,0xF9,0x24,0x30,0x19,0x12,0x02,0xF8,0x00,0x10};        // to store values corresponding to digits 0 to 9



void delay(int a)        // Function to provide a time delay of approx. 1 second using Timer1.

{

int i;

for(i=0;i<a;i++)

{

TL1=0xFD;

TH1=0x4B;

TR1=1;

while(TF1==0);

TR1=0;

TF1=0;

}

}



int setfn()        // Function to select minute and seconds digit to be set.

{

while(set==0)

{

switch(recnt_incr_seg)

{

case 1:

if(set==0)        //select the min2 digit

{

dig_ctrl_4=1;

dig_ctrl_3=0;

dig_ctrl_2=0;

dig_ctrl_1=0;

recnt_incr_seg=1;

ret_seg_to_incre=1;

P2=dig_val[min2];

delay(20);

}



case 2:

if(set==0)        // Select the min1 digit

{

dig_ctrl_4=0;

dig_ctrl_3=1;

dig_ctrl_2=0;

dig_ctrl_1=0;

recnt_incr_seg=2;

ret_seg_to_incre=2;

P2=dig_val[min1];

delay(20);

}



case 3:

if(set==0)        //Select the sec 2 digit

{

dig_ctrl_4=0;

dig_ctrl_3=0;

dig_ctrl_2=1;

dig_ctrl_1=0;

recnt_incr_seg=3;

ret_seg_to_incre=3;

P2=dig_val[sec2];

delay(20);

}



case 4:

if(set==0)        //Select the sec1 digit

{

recnt_incr_seg=1;

dig_ctrl_4=0;

dig_ctrl_3=0;

dig_ctrl_2=0;

dig_ctrl_1=1;

ret_seg_to_incre=4;

P2=dig_val[sec1];

delay(20);

recnt_incr_seg=1;

}

}

}

return(ret_seg_to_incre);

}



void increase(int a)        //Function to set the minute or seconds digit

{

while(incr==0)

{

switch(a)

{

case 1:        // To set the min2 digit.

P2=dig_val[min2];        //Display the value of min2

delay(15);

min2++;

if(min2==6)

min2=0;

P2=dig_val[min2];

delay(5);

break;



case 2:        //To set the min1 digit.

P2=dig_val[min1];

delay(15);

min1++;

if(min1==10)

min1=0;

P2=dig_val[min1];

delay(5);

break;



case 3:        // To set the sec2 digit.

P2=dig_val[sec2];

delay(15);

sec2++;

if(sec2==6)

sec2=0;

P2=dig_val[sec2];

delay(5);

break;



case 4:        //To set the sec1 digit.

P2=dig_val[sec1];

delay(15);

sec1++;

if(sec1==10)

sec1=0;

P2=dig_val[sec1];

delay(5);

break;

}

}

}



void resetfn()        // This function brings the clock to reset or set mode.

{

IE=0x80;        //Disable timer0 interrupt to stop the display of the clock

sel_seg_to_incr=1;

recnt_incr_seg=1;

dig_ctrl_4=1;

dig_ctrl_3=0;

dig_ctrl_2=0;

dig_ctrl_1=0;

P2=dig_val[min2];

delay(5);

while(1)

{

if(start==0)        //check if start pin is pressed

{

TMOD=0x11;        //reset the timer0

TL0=0xf6;

TH0=0xFf;

IE=0x82;        //enabling again the timer0 interrupt to start displaying of the clock

TR0=1;

break;        // break loop and return to main program

}



if(set==0)        //if set pin is pressed call set function

sel_seg_to_incr=setfn();



if(incr==0)        // if incr pin is pressed call incr function

increase(sel_seg_to_incr);

}

}

void display() interrupt 1        // function to display the values on seven segmnet. For more details refer seven segment multiplexing.

{

TL0=0x36;        //reloading timer0

TH0=0xf6;

P2=0xFF;

dig_ctrl_1 = dig_ctrl_3 = dig_ctrl_2 = dig_ctrl_4 = 0;

dig_disp++;

dig_disp=dig_disp%4;

switch(dig_disp)

{

case 0:

P2=dig_val[sec1];

dig_ctrl_1 = 1;

break;



case 1:

P2=    dig_val[sec2];

dig_ctrl_2 = 1;

break;



case 2:

P2=    dig_val[min1];

dig_ctrl_3 = 1;

break;



case 3:

P2=    dig_val[min2];

dig_ctrl_4 = 1;

break;

}

}



void main()        //main function the programs begins from here

{

set=1;        //delaring set, reset, start and incr as input pins

reset=1;

start=1;

incr=1;

TMOD=0x11;        //enabling timer0

TL0=0xf6;        //loading timer0

TH0=0xFf;

IE=0x82;        //initialize timer0 interrupt

TR0=1;        //triggering timer0

while(1)        //forward counting of clock

{

while(min2<6)

{

while(min1<10)

{

while(sec2<6)

{

while(sec1<10)

{

if(reset==0)

resetfn();

delay(20);

sec1++;

}

sec1=0;

sec2++;

}

sec1=0;

sec2=0;

min1++;

}

sec1=0;

sec2=0;

min1=0;

min2++;

}

min2=0;

}

}

i tried its also display only the minutes and seconds ..i need to diaplay with hours and minute so anyone has plz upload or send to [email protected]