How to calculate BPM for pulse sensore

Using Arduino Programming Questions
#1

Hi,

Currently I'm working on pulse sensor project. This is the code I'm using.

int ledPin = 13;
int sensorPin = A0;
double alpha = 0.75;
void setup ()
{
pinMode (ledPin, OUTPUT);
Serial.begin (115200);
}
void loop ()
{
static double oldValue = 0;
static double oldChange = 0;
int rawValue = analogRead (sensorPin);
float voltage = rawValue * (5.0 / 1023.0);
double BPM = alpha * oldValue + (1 - alpha) * rawValue;
Serial.println (BPM);
Serial.println (voltage);
delay(1000);
oldValue = value;

}

But I'm not getting proper BPM. Please help me If any one knows how to calculate BPM form analog values.

#2

Please help me If any one knows how to calculate BPM form analog values.

What kind of sensor is it? How do you determine, using that sensor, that a beat has occurred?

#3

I don't see a time register...

Also, with the delay function, the arduino really waits until the time is done. So it will only read the sensor pin once a second. Is that correct and what you want?

#4

Actually I'm using this pulse sensor http://www.ebay.in/itm/HEARTBEAT-SENSOR-FINGER-PULSE-DETECTING-HEARTBEAT-5V-MODULE-For-ARDUINO-/251944160842?_trksid=p2054897.l5675 .

And also they have given some code I'm using that one only for testing but it is not giving proper values.

#5