Arduino | Pulse Monitor

Maybe I've gone too far??  This pulse monitor uses an infrared (IR) light to detect the blood going through my finger.

Here is the Arduino code.  Most of it is not mine, it's mostly demo code from the example.  I had to change the alpha value to reduce static.

int ledPin = 12;
int sensorPin = 0;

double alpha = 0.60;
int period = 20;
double change = 0.0;
int goingUpSeries = 0;

void setup()                   
{
  pinMode(ledPin, OUTPUT);
  Serial.begin(115200);
}

void loop()                    
{
    static double oldValue = 0;
    static double oldChange = 0;
    int rawValue = analogRead(sensorPin);
    double value = alpha * oldValue + (1 - alpha) * rawValue;
    
    Serial.print(rawValue);
    Serial.print(",");
    Serial.println(value);
    
    change = value - oldValue;    
    digitalWrite(ledPin, isGoingUp(change, oldChange));
    oldValue = value;
    oldChange = change;
    
    delay(period);
}

boolean isGoingUp(double change, double oldChange) {
  return (change < 0.0 && oldChange > 0.0);
}