Data logger using pic16f877a

[Logu KS]

I am trying to make a temperature data logger using rtc, lm35 and eeprom 24lc512. I did upto writing and reading the temperature value in eeprom. Now i want to write and read the time and date also. At some periodic intervals that is set using rtc the date, time and the tempertaure value to be written into the eeprom. Then using a button the written values should be read and display it hyperterminal and lcd.

if(rtc_buf[0]%5==0 && prev_value != rtc_buf[0])
{
prev_value = rtc_buf[0]; 
write_EEPROM(address,hour);
address++;
write_EEPROM(address,minute);
address++;
write_EEPROM(address,second);
address++;
write_EEPROM(address,m);
address++;
write_EEPROM(address,n);
address++;
if(address>60000)address=0;
}

RB7=0;
//read_address=0;
if(RB7==1)
{
//read_address =0;
p=read_EEPROM(read_address);
read_address++;
q=read_EEPROM(read_address);
read_address++;
r=read_EEPROM(read_address);
read_address++;
RxByte=read_EEPROM(read_address);
read_address++;
RxByte1=read_EEPROM(read_address);

	txt1(p+0x30);
	txt1(10);
	txt1(13);
	txt1(q+0x30);
	txt1(10);
	txt1(13);
	txt1(r+0x30);
	txt1(10);
	txt1(13);
			
z=((RxByte<<8)|RxByte1);

		// Converting sample value to temperature
		T=(z*0.48876);

		Temp1 = (unsigned int)((T/100)%10);		// 1st digit
		Temp2 = (unsigned int)((T/10)%10);		// 2nd digit
		Temp3 = (unsigned int)((T/1)%10);		// 3rd digit
	
		// Displaying temperature in lcd
		
		lcdcommand(0xcd);
		if(T<=99)
		{
		    lcddata(' ');				// displaying the 1st digit
			lcddata(Temp2+0x30);		// displaying the 2nd digit
			lcddata(Temp3+0x30);		// displaying the 3rd digit
		}
	
		lcdcommand(0xcd);
		if(T>=100)
		{
			lcddata(Temp1+0x30);		// displaying the 1st digit
			lcddata(Temp2+0x30);		// displaying the 2nd digit
			lcddata(Temp3+0x30);		// displaying the 3rd digit
//			lcddata('C');
		}
		
		txt1(Temp1+0x30);
		txt1(Temp2+0x30);	
		txt1(Temp3+0x30);
		txt1(10);
		txt1(13);
		read_address++;
	}

I just added the writing and reading part of the code. rtc_bu[0] is for seconds buffer. If seconds becomes multilples of 5 (ie) 5,10,15,20,25..... the date, time and temperature value should be written into the eeprom and pressing a button the written values should be read and displayed in lcd and hyperterminal

 

[udayan92]

So where in the data logger system,are you facing a problem?Is it in the code?

the date, time and temperature value should be written into the eeprom and pressing a button the written values should be read and displayed in lcd and hyperterminal

You mean the instantaneous value(s),right?and why would you be using both the hyperterminal and LCD?