body temperature monitoring system

hi all

i have designed body temperature monitoring system using LM35 and i got the out put is there any other way to measure the body temperature using 8051

Does it measure negative temperatures?

internetuser2k12 said:

Does it measure negative temperatures?

Click to expand...

in my project i measure only positive temperature.
ya sure but we need to give negative voltage.
LM35 can measure temperatures from -55deg to 150deg and we need negative supply voltage for measuring this negative temperature.

I have written this coding for heart rate and body temperature monitoring system using embedded C for AT89c51
i m getting output but the heart rate count is varying !!!

wat shall i do !!!

#include<reg51.h>
#include<intrins.h>
unsigned char beat,BPS,BPM;
unsigned char itime,B1,B2,B3,a,string,i,j,V,f,d;
void command (unsigned char);
void display (unsigned char);
void ready ();
void lcd ();
void delay (unsigned char );
void conversion_Ascii(unsigned char);
void conversion(unsigned char);
sbit RD_A=P2^5;
sbit WR_A=P2^6;
sbit INTR=P2^7;
unsigned char x,z,k,temp,q1,q2,q3,q;
unsigned char msg[]={"B.T:"};
unsigned char msg1[]={"H.B:"};
sbit RS=P2^0;
sbit RW=P2^1;
sbit EN=P2^2;
sbit BUSY=P0^7;
sbit HB=P3^0;
sbit BT=P3^1;
void main()
{
P0=0x00;
P1=0xff;
P2=0x00;
HB=0;
BT=0;
command(0x38);
command(0x01);
command(0x0e);
WR_A=0;
_nop_();
_nop_();
WR_A=1;
INTR=1;
while(INTR==1);
RD_A=1;
_nop_();
_nop_();
RD_A=0;
command(0x06);
command(0x80);
for(k=0;k<4;k++)
{
z=msg[k];
display(z);
}
x=P1;
x=((x*0x5*0x64)/0xff);
temp=x;

BT=0;
if (temp >= 35 && temp <= 40)
{
command(0x86);
conversion(x);
display('N');
display('o');
display('r');
display('m');
display('a');
display('l');
BT=0;
}
else if( temp <= 34)
{
command(0x86);
conversion(x);
display('L');
display('o');
display('w');
BT=1;
}
else if (temp>=41)
{
command(0x86);
conversion(x);
display('H');
display('i');
display('g');
display('h');
BT=1;
}
T0=1;
TMOD=0x06;
TL0=0;
TR0=1;
delay(1000);
beat=TL0;
while(TF0==0);
TR0=0;
TF0=0;

BPS=beat;
BPM=BPS*60;
BPM=BPS;

command(0x06);
command(0xc0);

for(f=0;f<4;f++)
{
d=msg1[f];
display(d);
}
HB=0;

if(BPM >=60 && BPM <=100)
{
lcd();
conversion_Ascii(BPM);
display('N');
display('o');
display('r');
display('m');
display('a');
display('l');
HB=0;
}

else if ( BPM <=60)
{
lcd();
conversion_Ascii(BPM);
display('l');
display('o');
display('w');
HB=1;
}

else if (BPM >= 100)
{
lcd();
conversion_Ascii(BPM);
display('H');
display('i');
display('g');
display('h');
HB=1;
}
while(1);
}



void lcd ()
{
command(0x06);
command(0xc6);
}
void command (unsigned char a)
{
ready();
RS=0;
RW=0;
P0=a;
EN=1;
_nop_();
_nop_();
EN=0;
}

void ready()
{
RS=0;
RW=1;
BUSY=1;
EN=0;
_nop_();
_nop_();
EN=1;
while(BUSY==1);
}

void display(unsigned char string)
{
ready();
RS=1;
RW=0;
P0=string;
EN=1;
_nop_();
_nop_();
EN=0;
}

void conversion_Ascii( unsigned char out)
{
V=out/10;
B1=out%10;
B2=V%10;
B3=V/10;

B3=B3+0x30;
B2=B2+0x30;
B1=B1+0x30;

display(B3);
display(B2);
display(B1);
}

void conversion(unsigned char m)
{
q=m/10;
q1=m%10;
q2=q%10;
q3=q/10;


q3=q3+0x30;
q2=q2+0x30;
q1=q1+0x30;

display(q3);
display(q2);
display(q1);
display('•');
display('c');
}
void delay(unsigned char itime)
{
for(i=0;i<itime;i++)
for(j=0;j<123;j++);
}

How are you sensing Heart Beat? Use Code tags to post code.

Hello!

I'm not sure about what you mean by "heart rate count is varying". Usually heart beat is meant
to vary and that's why it is monitored...
I made a heart beat sensor. Analog and self tuning system, but it releases a square pulse
everytime it's detected. Then I use a plain timer to detect time between 2 beats.

Dora.