heart_rate.c

//https://github.com/WorldFamousElectronics/PulseSensorPlayground

define USE_ARDUINO_INTERRUPTS true  
#include <PulseSensorPlayground.h>     

//  Variables
const int PulseWire = 0;       
const int LED13 = 13;          
int Threshold = 550;          
                             
PulseSensorPlayground pulseSensor;  


void setup() {

  Serial.begin(9600);         

  // Configure the PulseSensor object
  pulseSensor.analogInput(PulseWire);
  pulseSensor.blinkOnPulse(LED13);       
  pulseSensor.setThreshold(Threshold);

   if (pulseSensor.begin()) {
    Serial.println("pulseSensor Object created!"); 
  }
}



void loop() {

 int myBPM = pulseSensor.getBeatsPerMinute();  

if (pulseSensor.sawStartOfBeat()) {           
 Serial.println("Heart beat"); 
 Serial.print("BPM: ");                      
 Serial.println(myBPM);                      
}

  delay(100);               

}