Week 16 Final Project

int ledPin1=13;

int ledPin2=12;

int ledPin3=11;

int ledPin4=10;

int ledPin5=9;

int ledPin6=8;

int ledPin7=7;

int ledPin8=6;

int ledPin9=5;

int ledPin10=4;

int ledPin11=3;

int ledPin12=2;

int sensorPin=0;

float alpha=0.75;

int period=50;

float change=0.0;

void setup()

{

  // Built-in arduino board pin

  pinMode(ledPin1,OUTPUT);

  pinMode(ledPin2,OUTPUT);

  pinMode(ledPin3,OUTPUT);

  pinMode(ledPin4,OUTPUT);

  pinMode(ledPin5,OUTPUT);

  pinMode(ledPin6,OUTPUT);

  pinMode(ledPin7,OUTPUT);

  pinMode(ledPin8,OUTPUT);

  pinMode(ledPin9,OUTPUT);

  pinMode(ledPin10,OUTPUT);

  pinMode(ledPin11,OUTPUT);

  pinMode(ledPin12,OUTPUT);

  Serial.begin(9600);

  Serial.print("Heartrate detection.\n");

  delay(100);

}

float max =0.0;

void loop()

{

  static float oldValue=1009;

  static float oldChange=0.2;

  // This is generic code provided with the board.

  int rawValue=analogRead(sensorPin);

  float value= alpha*oldValue +(1-alpha)* rawValue;

  change=value-oldValue;

  // Display data on the LED via a blip:

  // Empirically, if we detect a peak as being X% from

  // absolute max, we find the pulse even when amplitude

  // varies on the low side.

  

  // Reset max every time we find a new peak

  if (change >= max) {

    max= change;

    Serial.println("  |");

    digitalWrite(ledPin1,1);

    digitalWrite(ledPin2,1);

    digitalWrite(ledPin3,1);

    digitalWrite(ledPin4,1);

    digitalWrite(ledPin5,1);

    digitalWrite(ledPin6,1);

    digitalWrite(ledPin7,1);

    digitalWrite(ledPin8,1);

    digitalWrite(ledPin9,1);

    digitalWrite(ledPin10,1);

    digitalWrite(ledPin11,1);

    digitalWrite(ledPin12,1);

  } else {

    Serial.println("|");

    digitalWrite(ledPin1,0);

    digitalWrite(ledPin2,0);

    digitalWrite(ledPin3,0);

    digitalWrite(ledPin4,0);

    digitalWrite(ledPin5,0);

    digitalWrite(ledPin6,0);

    digitalWrite(ledPin7,0);

    digitalWrite(ledPin8,0);

    digitalWrite(ledPin9,0);

    digitalWrite(ledPin10,0);

    digitalWrite(ledPin11,0);

    digitalWrite(ledPin12,0);

  }

  // Slowly decay max for when sensor is moved around

  // but decay must be slower than time needed to hit

  // next heartbeat peak.

  max = max * 0.98;

  

  // Display debug data on the console

//  Serial.print(value);

//  Serial.print(", ");

//  Serial.print(change);

//  Serial.print(", ");

//  Serial.println(max);

  oldValue=value;

  oldChange=change;

  delay(period);

}