Heart rate monitor using Arduino and lab view

using the same circuit in the previous post, the arduino source code is only changed, and for viewing output

Arduino Code for Heart rate measurement

int val, beat;

int count = 0;

unsigned int previoustime;

unsigned int currentime;

float del;

void setup()

{

  Serial.begin(9600);

  //lcd.begin(8, 2);

  pinMode(A0, INPUT);

  pinMode(13, OUTPUT);

  //Beat status LED

}

void loop()

{

  val = analogRead(A0);

  if (val > 200)

  {

    count++;

    currentime = millis();

    del = currentime - previoustime;

    previoustime = currentime;

    float Q = 1000 / del;

     float fb = 60 * Q;

   Serial.println(fb);

    digitalWrite(13, HIGH);

    delay(400);

  }

  else

  {

    digitalWrite(13, LOW);

  }

}

Block diagram:

Front panel