Cảm biến nhịp tim dùng at89c51

[tan ve chai]

Đây là thông tin của mạch, phần cảm biến mình đã text xong. Nhưng code thì mình không chuyển được. Mong được chỉ giáo!



Mạch xử lý tín hiệu nhịp tim từ mạch cảm biến hiển thị các chỉ số nhịp tim lên LCD:



Đây là code
// -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=// -=-=-=-=- Hardware Defines -=-=-=-=-=-=-=
// -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
sbit SENSOR = P1^0; //sensor is connected to this pin
unsigned int beatms;
float bpm;
char buf[20];
// -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
// -=-=-=-=- Main Program -=-=-=-=-=-=-=
// -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
void main()
{
// -=-=- Intialize variables -=-=-=
lcdInit();
// -=-=- Welcome LCD Message -=-=-=
lcdClear();
lcdGotoXY(0,0); // 1st Line of LCD
// "xxxxxxxxxxxxxxxx"
lcdPrint("DIGITAL HEART");
lcdGotoXY(0,1); // 2nd Line of LCD
// "xxxxxxxxxxxxxxxx"
lcdPrint("BEAT MONITOR");
beatms=0; // will store duration between two pulses
// -=-=- Program Loop -=-=-=
while(1)
{
while(SENSOR==0);// wait for high pulse from sensor
DelayNmS(10); // 10ms delay so that it does not listen to any noise
beatms = 10; // start counting beatms from 10ms since we have delay after pulse
while(SENSOR==1)// wait until signal is high
{
DelayNmS(1); //wait 1msec
beatms++; //keep incrementing counter each 1ms
}
while(SENSOR==0) //keep looping till signal goes back high, wait for next
{
DelayNmS(1); //wait 1msec
beatms++; //keep incrementing counter each 1ms
}
// beatms variable will now have time in ms between two high edge pulse
lcdClear();
lcdGotoXY(0,0);
lcdPrint("HEART RATE : ");
bpm = (float)60000/beatms; // see document of #1157 for this calculation
if(bpm > 200)
{
lcdGotoXY(0,1);
sprintf (buf, "Processing......"); // Invalid, Wait for next cycle
lcdPrint(buf);
} else {
lcdGotoXY(0,1);
sprintf (buf, "%0.0f BPM", bpm); // Display reading in BPM
lcdPrint(buf);
}
}
}