/* Filename: PulseRateTEST - Pulse Rate Monitor - using external R2 */

int ledPin = 12;	int sensorPin = A0;
double alpha = 0.75;	int period = 20;	double change = 0.0;

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

void loop( )	{
static double oldVal = 0;
static double oldChange = 0;
int rawVal =analogRead(sensorPin);
double val = alpha * oldVal  + (1 - alpha) * rawVal;
Serial.print(rawVal);	Serial.print(“,”);
Serial.println(val);	
oldVal = val;	delay(period);
}	// END