Arduino Heart Rate Sensor Outputting

Hi,

Not sure what I’m doing wrong but I’ve got the below code yet it just outputs “Heart Rate: 10” and outputs 10 in the console, too. I’m using a heart rate sensor from PulseSensor.com with my Arduino. When I open the Arduino monitor separately it’s outputting the correct BPM.

  #include "ofApp.h"
int byteData;
//--------------------------------------------------------------
void ofApp::setup() {
	ofSetLogLevel(OF_LOG_VERBOSE);
	//General setup of look of window.
	ofBackground(255);
	verdana14.load("verdana.ttf", 14, true, true);
	ofSetColor(0);
	if (!serial.setup("COM3", 115200)) {
		ofLogError() << "could not open serial port - listing serial devices";
		serial.listDevices();
		
	}
}

//--------------------------------------------------------------
void ofApp::update() {

	if (serial.available() < 0) {
		msg = "Arduino Error";
		
	}
	else {
		//While statement looping through serial messages when serial is being provided.
		while (serial.available() > 0) {
			//byte data is being writen into byteData as int.
			byteData = serial.readByte();

			//byteData is converted into a string for drawing later.
			msg = "Heart Rate: " + ofToString(byteData);
		}
	}
}

//--------------------------------------------------------------
void ofApp::draw() {
	//drawing the string version pf byteData on oF window.
	verdana14.drawString(msg, 50, 100);

	//printing byteData into console.
	cout << byteData << endl;
}

I have ‘BPM’ as a variable in my Arduino code, found below.
#include <PulseSensorPlayground.h>

volatile int BPM;
volatile boolean QS = false;
volatile int IBI = 600;
volatile int Signal;
volatile boolean Pulse = false;
int redPin = 13;
int greenPin = 12;
int pulsePin = 0;
int blinkPin = 11;

void setup() {

Serial.begin(115200);
interruptSetup();
pinMode(redPin, OUTPUT);       
pinMode(greenPin, OUTPUT);

}

void loop(){

   
  if (QS == true) {
        healthCheck();
   
    Serial.print("Your Current Heart Rate Is: ");            
    Serial.println(BPM);
    Serial.write(BPM);          
    QS = false;
  
   }
  

  delay(2500);
}

Does anyone know why it would be outputting 10? I have a feeling it’s to do with the byteData but I’m not overly sure!

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