Need help with LCD based alrm clock with digital thermometer

[Jasper Nunisa]

I have problem in executing the following part of the program code. Could anyone tell me what the error is and suggest a solution?? The alarm function doesnt work at all. And in the timing function, only the dig_hr and dig_min buttons work.

“

lcd_data_int(int time_val)  // Function to send number to LCD
{
int int_amt;
int_amt=time_val/10;
lcd_data(int_amt+48);
int_amt=time_val%10;
lcd_data(int_amt+48);
}”

 

The full program is:

 

// Program to make a digital clock with integrated Alarm and digital thermometer
#include<reg51.h>
#define port P1
#define adc_input P0
#define cont_port P3
#define dataport P2
#define m_sec 10
sbit rs = cont_port^0;
sbit rw = cont_port^1;
sbit en = cont_port^6;
sbit dig_hr1=port^0;
sbit dig_min1=port^1;
sbit start=port^2;
sbit am_pm=port^3;
sbit alarm_set=port^4;
sbit alarm=port^7;
sbit wr= P3^2;
sbit rd= P3^3;
sbit intr= P3^4;

int hr ,hr1=0,alarm_hr=0;
int min,min1=0,alarm_min=0;
int sec,sec1=0,dig_am_pm=0,alarm_am_pm=0;
int test_final=0,test_intermediate1[10],test_intermediate2[3]={0,0,0};

void delay(unsigned int msec) // Time dealy function
{
int i,j ;
for(i=0;i<msec;i++)
  for(j=0;j<1275;j++);
}

void lcd_cmd(unsigned char item)  //Function to send command to LCD           
{
dataport = item;
rs= 0;
rw=0;
en=1;
delay(1);
en=0;
return;
}

void lcd_data(unsigned char item) // Function to send data to LCD
{
dataport = item;
rs= 1;
rw=0;
en=1;
delay(1);
en=0;
return;
}

void lcd_data_string(unsigned char *str) // Function to send string to LCD
{
int i=0;
while(str!=’’)
{
  lcd_data(str);
  i++;
  delay(1);
}
return;
}

lcd_data_int(int time_val)  // Function to send number to LCD
{
int int_amt;
int_amt=time_val/10;
lcd_data(int_amt+48);
int_amt=time_val%10;
lcd_data(int_amt+48);
}

void lcd(unsigned char str1[10])
{
lcd_cmd(0x38);
lcd_cmd(0x0e);
delay(1);
lcd_data_string(str1);
}

void shape()  // Function to create the shape of degree
{
lcd_cmd(64);
lcd_data(2);
lcd_data(5);
lcd_data(2);
lcd_data(0);
lcd_data(0);
lcd_data(0);
lcd_data(0);
lcd_data(0);
}

void convert()  // Function to convert the data of ADC
{
int s;
s=test_final/100;
test_final=test_final%100;
lcd_cmd(0xc9);
if(s!=0)
lcd_data(s+48);
else
lcd_cmd(0x06);
s=test_final/10;
test_final=test_final%10;
lcd_data(s+48);
lcd_data(test_final+48);
lcd_data(0);
lcd_data(‘C’);
lcd_data(‘ ‘);
delay(2);
}

void set_hr1()  // Function to set set hours digit of clock
{
hr1++;
if(hr1>11)
hr1=0;
lcd_cmd(0xc3);
lcd_data_int(hr1);
lcd_data(‘:’);
}

void set_min1()  // Function to set set minutes digit of clock
{
min1++;
if(min1>59)
min1=0;
lcd_cmd(0xc6);
lcd_data_int(min1);
}

void set_alarm_hr1() // Function to set set hours digit of alarm
{
alarm_hr++;
if(alarm_hr>11)
alarm_hr=0;
lcd_cmd(0xc3);
lcd_data_int(alarm_hr);
lcd_data(‘:’);
}

void set_alarm_min1() // Function to set set minutes digit of clock
{
alarm_min++;
if(alarm_min>59)
alarm_min=0;
lcd_cmd(0xc6);
lcd_data_int(alarm_min);
}

void alarm_check()  // Function to check alarm
{
if(hr==alarm_hr)
{
  if(min==alarm_min)
  {
   if(dig_am_pm==alarm_am_pm)
   {
    alarm=1;
    lcd_cmd(0x8b);
    lcd(“ALARM”);
   }
  }
}
}

void temp() // Function to calculate temperature
{
int i;
for(i=0;i<10;i++)
{
  delay(1);
  rd=1;
  wr=0;
  delay(1);
  wr=1;
  while(intr==1);
  rd=0;
  lcd_cmd(0x88);
  test_intermediate1=adc_input/10;
  delay(1);
  intr=1;
}
for(i=0;i<10;i++)
test_intermediate2[0]=test_intermediate1+test_intermediate2[0];

for(i=0;i<10;i++)
{
  delay(1);
  rd=1;
  wr=0;
  delay(1);
  wr=1;
  while(intr==1);
  rd=0;
  lcd_cmd(0x88);
  test_intermediate1=adc_input/10;
  delay(1);
  intr=1;
}
for(i=0;i<10;i++)
test_intermediate2[1]=test_intermediate1+test_intermediate2[1];

for(i=0;i<10;i++)
{
  delay(1);
  rd=1;
  wr=0;
  delay(1);
  wr=1;
  while(intr==1);
  rd=0;
  lcd_cmd(0x88);
  test_intermediate1=adc_input/10;
  delay(1);
  intr=1;
}
for(i=0;i<10;i++)
test_intermediate2[2]=test_intermediate1+test_intermediate2[2];

test_intermediate2[0]=test_intermediate2[0]/3;
test_intermediate2[1]=test_intermediate2[1]/3;
test_intermediate2[2]=test_intermediate2[2]/3;
test_final=test_intermediate2[0]+test_intermediate2[1]+test_intermediate2[2];
shape();
convert();
}

void main()
{
int k;
start=1;
dig_hr1=1;
dig_min1=1;
alarm_set=1;
alarm=0;
lcd_cmd(0x83);
lcd(“SET ALARM”);
lcd_cmd(0xc3);
lcd_data_int(hr1);
lcd_data(‘:’);
lcd_data_int(min1);
while(alarm_set==0)
{
  delay(10);
  if(dig_hr1==0)
  set_alarm_hr1();
  if(dig_min1==0)
  set_alarm_min1();
}

if(am_pm==0)
{
  lcd_cmd(0xc8);
  lcd_data_string(“am”);
  alarm_am_pm=0;
}

if(am_pm==1)
{
  lcd_cmd(0xc8);
  lcd_data_string(“pm”);
  alarm_am_pm=1;
}
delay(200);
lcd_cmd(0x01);
lcd_cmd(0x83);
lcd(“SET TIMING”);
lcd_cmd(0xc3);
lcd_data_int(hr1);
lcd_data(‘:’);
lcd_data_int(min1);
while(start==0)
{
  delay(10);
  if(dig_hr1==0)
  set_hr1();
  if(dig_min1==0)
  set_min1();
}

if(am_pm==0)
{
  lcd_cmd(0xc8);
  lcd_data_string(“am”);
  dig_am_pm=0;
}

if(am_pm==1)
{
  lcd_cmd(0xc8);
  lcd_data_string(“pm”);
  dig_am_pm=1;
}
delay(200);
lcd_cmd(0x01);
while(1)
{
  for(k=0;k<2;k++)
  {
   for(hr=hr1;hr<12;hr++)
   {
    for(min=min1;min<60;min++)
    {
     for(sec=0;sec<60;sec++)
     {
      lcd_cmd(0x81);
      delay(1);
      lcd_data_int(hr);
      lcd_data(‘:’);
      lcd_data_int(min);
      lcd_data(‘:’);
      lcd_data_int(sec);
      if(dig_am_pm==0)
      {
       lcd(“am”);
      }
      else
      {
       lcd(“pm”);
      }
      alarm_check();
      lcd_cmd(0xc3);
      delay(2);
      lcd_data_string(“TEMP:”);
      temp();
      lcd_data_string(”    “);
     }
    }
   min1=0;
   }
  if(dig_am_pm==0)
  dig_am_pm=1;
  else
  dig_am_pm=0;
  hr1=0;
  }
}
}

[prabhat rayal]

hello jasper, i am facing the same problem. alarm doesnt work at all. i have made some changes in program and now clock and thermometer are working perfectly. clock is not much accurate but its fine. make the following changes in beginning.

replace:

 

sbit wr= P3^2;
sbit rd= P3^3;
sbit intr= P3^4;

 

 

with:

 

sbit wr= P3^3;
sbit rd= P3^4;
sbit intr= P3^5;

 this helped me, as in the circuit 3rd, 4th and 5th pins are connected to wr, rd and intr respectively.

if clock is slow, you can make changes in j<1275, it worked for me.

PS: I am not a programmer but i made these changes and they worked for me however i am stll unable to get the alarm into work. please reply if you find any solution

 

[Jasper Nunisa]

   Thank you so much for your solution. By the way, I’m using a simulator ‘Proteus’ and it worked for me there. But I havent checked in the actual circuit. I’ll analyse and give you the details.

    For me the alarm function works as well. I think you are not aware of how to set it. The actual principle behind it is the latching operation. Like the Spdt switch used, which is connected to port 1^2 of the AT89c51 should be grounded while setting the Alarm and Time. Also remember that, before you do this, you should keep the alarm button at on position, until the alarm has been set.

 Once you release the alarm button, the display will show the timing setting..

  Hope this works for you..

  You may ask for any further doubts  

[prabhat rayal]

Hello jasper, i made some more changes in ckt and it worked but still, can you please show me your proteus ckt and the code. you can mail the code and proteus design you are using at “[email protected]”…i shall be very thankful to you..thanks

[Jasper Nunisa]

 Hey Prabhat, 

                     I sent you the circuit in Proteus and the code. The software works fine but

                     I’m actually having problems in the Lcd connections in hardware. Could you mail me your circuit as well??

Thanks a lot!

[Mukaram Jawaid]

I made this project but my lcd is blank can any one tell me why this happen to me

 

i think in this code  inisializing LCD programme is missing

 

Please give me full code..

i m beginner

 

 

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