
/*  Pulse Sensor Amped 1.4    by Joel Murphy and Yury Gitman   http://www.pulsesensor.com

----------------------  Notes ----------------------  ---------------------- 
This code:
1) Blinks an LED to User's Live Heartbeat   PIN 13
2) Fades an LED to User's Live HeartBeat
3) Determines BPM
4) Prints All of the Above to Serial

Read Me:
https://github.com/WorldFamousElectronics/PulseSensor_Amped_Arduino/blob/master/README.md   
 ----------------------       ----------------------  ----------------------
*/

//  Variables
int pulsePin = 0;                 // Pulse Sensor purple wire connected to analog pin 0
int blinkPin = 13;                // pin to blink led at each beat

// Volatile Variables, used in the interrupt service routine!
//volatile double BPM;                   // int that holds raw Analog in 0. updated every 2mS
volatile int Signal;                // holds the incoming raw data
volatile int IBI = 600;             // int that holds the time interval between beats! Must be seeded! 
volatile boolean Pulse = false;     // "True" when User's live heartbeat is detected. "False" when not a "live beat". 
volatile boolean QS = false;        // becomes true when Arduoino finds a beat.

// Regards Serial OutPut  -- Set This Up to your needs
static boolean serialVisual = false;   // Set to 'false' by Default.  Re-set to 'true' to see Arduino Serial Monitor ASCII Visual Pulse 


void setup(){
  pinMode(blinkPin,OUTPUT);         // pin that will blink to your heartbeat!
  Serial.begin(115200);             // we agree to talk fast!
  interruptSetup();                 // sets up to read Pulse Sensor signal every 2mS 
   // UN-COMMENT THE NEXT LINE IF YOU ARE POWERING The Pulse Sensor AT LOW VOLTAGE, 
   // AND APPLY THAT VOLTAGE TO THE A-REF PIN
//   analogReference(EXTERNAL);   
}


//  Where the Magic Happens
void loop(){
  if (QS && IBI > 300) {
    Serial.print('|');
    Serial.print(IBI);
    Serial.print('|');
    Serial.println();
    digitalWrite(blinkPin,HIGH);     // Blink LED, we got a beat. 
    QS = false;                      // reset the Quantified Self flag for next time    
  } else { 
    digitalWrite(blinkPin,LOW);            // There is not beat, turn off pin 13 LED
  }

  delay(20);                             //  take a break
}









