Heart Rate Monitor Using Pulse Sensor and Maker Nano

NanoPulseLCD.ino

/*
  Project: Heart Rate Monitor Using Pulse Sensor and Maker Nano
  Board: Arduino Nano (Maker Nano)
  
  Connections:
  Nano | I2C LCD Grove
   GND - GND
    5V - VCC
   SDA - SDA
   SCL - SCL

  Nano | Pulse Sensor
   GND - GND
    5V - VCC
    A0 - SIG
  
  External libraries:
  - Grove LCD RGB Backlight by Seeed Studio V1.0.0 (Manager)
  - PulseSensor Playground by Joel Murphy, Yury Gitman, Brad Needham V1.5.1 (Manager)
 */

#define USE_ARDUINO_INTERRUPTS true

#include <PulseSensorPlayground.h>
#include <rgb_lcd.h>

const int PulseWire = 0;
int Threshold = 550;

PulseSensorPlayground pulseSensor;

rgb_lcd lcd;

byte led, ledOn;
int pulseAdc;

void setup()
{
  for (led = 2; led < 13; led++) {
    pinMode(led, OUTPUT);
  }

  Serial.begin(9600);
  lcd.begin(16, 2);

  pulseSensor.analogInput(PulseWire);
  pulseSensor.setThreshold(Threshold);

  if (pulseSensor.begin()) {
    Serial.println("We created a pulseSensor Object !");
    lcd.print("Heartrate (BPM)");
  }
}

void loop()
{
  pulseAdc = analogRead(PulseWire);
  ledOn = map(pulseAdc, 0, 1000, 2, 14);

  for (led = 2; led < ledOn; led++) { // Turn on LEDs
    digitalWrite(led, HIGH);
  }
  for (led = ledOn; led < 13; led++) { // Turn off LEDs
    digitalWrite(led, LOW);
  }
  
  int myBPM = pulseSensor.getBeatsPerMinute();

  if (pulseSensor.sawStartOfBeat()) {
    Serial.println("♥  A HeartBeat Happened ! ");
    Serial.print("BPM: ");
    Serial.println(myBPM);

    lcd.setCursor(0, 1);
    lcd.print(myBPM); lcd.print(" ");
  }
}