#include <LiquidCrystal_I2C.h>
PulseSensorPlayground pulseSensor; // Creates an instance of the PulseSensorPlayground object called "pulseSensor"
LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() { 
    Serial.begin(9600); // For Serial Monitor
    // Configure the PulseSensor object, by assigning our variables to it.
    pulseSensor.blinkOnPulse(LED13); //auto-magically blink Arduino's LED with heartbeat.
    // Double-check the "pulseSensor" object was created and "began" seeing a signal.
    if (pulseSensor.begin()) {
        Serial.println("We created a pulseSensor Object !"); //This prints one time at Arduino power-up, or on Arduino reset.
void loop() { 
    int myBPM = pulseSensor.getBeatsPerMinute(); // Calls function on our pulseSensor object that returns BPM as an "int".
    // "myBPM" hold this BPM value now.
    if (pulseSensor.sawStartOfBeat()) { // Constantly test to see if "a beat happened".
        Serial.println("♥ A HeartBeat Happened ! "); // If test is "true", print a message "a heartbeat happened".
        Serial.print("BPM: "); // Print phrase "BPM: "
        Serial.println(myBPM); // Print the value inside of myBPM.

        lcd.print("BPM: "); // Print phrase "BPM: "
    delay(50); // considered best practice in a simple sketch.