#define USE_ARDUINO_INTERRUPTS true    // Set-up low-level interrupts for most acurate BPM math
#include <PulseSensorPlayground.h>     // Includes the PulseSensorPlayground Library

const int PulseWire = 0;       // 'S' Signal pin connected to A0
const int LED13 = 13;          // The on-board Arduino LED
int Threshold = 550;           // Determine which Signal to "count as a beat" and which to ignore

PulseSensorPlayground pulseSensor;  // Creates an object

void setup() {
  Serial.begin(9600);

  // Configure the PulseSensor object, by assigning our variables to it
  pulseSensor.analogInput(PulseWire);
  pulseSensor.blinkOnPulse(LED13);       // Blink on-board LED with heartbeat
  pulseSensor.setThreshold(Threshold);

  // Double-check the "pulseSensor" object was created and began seeing a signal
  if (pulseSensor.begin()) {
    Serial.println("PulseSensor object created!");
  }
}

void loop() {
  int myBPM = pulseSensor.getBeatsPerMinute();      // Calculates BPM

  if (pulseSensor.sawStartOfBeat()) {               // Constantly test to see if a beat happened
    Serial.println("♥  A HeartBeat Happened ! "); // If true, print a message
    Serial.print("BPM: ");
    Serial.println(myBPM);                        // Print the BPM value
    }

  delay(20);
}