problem in interfacing seven segment dislay on proteus

[abhishekdixit]

hello,
i am using seven segment display for making digital clock. i have made a program for this but on the time of simulating on proteus, it does not gives output & its also does not display even a single seven display. when i start simulation it gives an error." SIMULATION IS NOT RUNNING IN REAL TIME DUE TO EXCESSIVE CPU LOAD" now i am unable to understand what should i do??

please help me..


with regards,
Abhishek Dixit

 

[nagkiller]

Where schematic and code???

 

[abhishekdixit]

hi negkiller,
as per your requirement i am showing you my code and schematic..

#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;
    }
}

and here is my schematic


and this is the error

 

[jayanth.devarayanadurga]

You have to put pullup resistors from P1.4 to P1.7. P2 pins show that it is active hign (red blocks) and transistor emitter is not red. See if transistor emitter turns red after pressing switch.


Edit: It is a common anode display so the 7 pins connected to MCU should be low to work. I think the pins are high according to your code.

 

[abhishekdixit]

hello jayanth,
sorry but i am unable to understand that what should i change?? the problem is in my code or my schematic diagram?

- - - Updated - - -

hello jayanth,
sorry but i am unable to understand that what should i change?? the problem is in my code or my schematic diagram?

 

[jayanth.devarayanadurga]

I see that P2 is being made high through code. You have to make P2 pins low to turn on 7 Segment. Post your code.

 

[abhishekdixit]

hello jayanth,
i hav done whatever you said, but my code is not working... if you want to see my code, i am posting u my code.

#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     
{
	P2=0;
    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;
    }
}

Please verify my code
thank you

- - - Updated - - -

hello jayanth,
i hav done whatever you said, but my code is not working... if you want to see my code, i am posting u my code.

#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     
{
	P2=0;
    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;
    }
}

Please verify my code
thank you

 

[jayanth.devarayanadurga]

Connect one of the 7 pins of 7 Segment to GND and see if any segment lights up.

In you code

---

Code C - [expand]
1
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while(set==0)
    {
        switch(recnt_incr_seg)
        {
            case 1:
            if(set==0)        //select the min2 digit
                    .
                    .
                    .
            {

---

set is a tact switch and it goes low only when set is pressed. Once you release it the pin will become high. Let us assume the code has entered while(set==0) loop but if you release the switch then the if(set==0) never gets executed because set will not be 0.

 

[nagkiller]

I think about the speed of display refresh is to fast than simulator, you can reduce the Frame per seconds into System/Set Animation Options... (but animation run low)
Or change delay to refesh the display in c code.