#define USE_ARDUINO_INTERRUPTS true
#include <PulseSensorPlayground.h> 
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);

const int sensor = 0; 
int buzzer=4;
int threshold = 550; 

byte heart1[8] = {B11111, B11111, B11111, B11111, B01111, B00111, B00011, B00001};
byte heart2[8] = {B00011, B00001, B00000, B00000, B00000, B00000, B00000, B00000};
byte heart3[8] = {B00011, B00111, B01111, B11111, B11111, B11111, B11111, B01111};
byte heart4[8] = {B11000, B11100, B11110, B11111, B11111, B11111, B11111, B11111};
byte heart5[8] = {B00011, B00111, B01111, B11111, B11111, B11111, B11111, B11111};
byte heart6[8] = {B11000, B11100, B11110, B11111, B11111, B11111, B11111, B11110};
byte heart7[8] = {B11000, B10000, B00000, B00000, B00000, B00000, B00000, B00000};
byte heart8[8] = {B11111, B11111, B11111, B11111, B11110, B11100, B11000, B10000};

int wait = 500; //waiting time to display instructions on LCD.
                               
PulseSensorPlayground pulseSensor; 

void setup() 
{   
  Serial.begin(9600);
  lcd.begin(16,2);
  
  lcd.createChar(1, heart1);
  lcd.createChar(2, heart2);
  lcd.createChar(3, heart3);
  lcd.createChar(4, heart4);
  lcd.createChar(5, heart5);
  lcd.createChar(6, heart6);
  lcd.createChar(7, heart7);
  lcd.createChar(8, heart8);
  
  
  lcd.setCursor(0,0);
  lcd.print(" HeartBeat Rate ");
  lcd.setCursor(0,1);
  lcd.print("   Monitoring   ");

  pulseSensor.analogInput(sensor);   
  pulseSensor.setThreshold(threshold);   
  pinMode(4, OUTPUT);

  pulseSensor.begin();
 
  delay(2000);
  lcd.clear();
}

void loop() {
  int BPM = pulseSensor.getBeatsPerMinute();
  if (pulseSensor.sawStartOfBeat())
   { 
    Serial.println(BPM); 

    lcd.setCursor(1,1);
    lcd.write(byte(1));
    lcd.setCursor(0,1);
    lcd.write(byte(2));
    lcd.setCursor(0,0);
    lcd.write(byte(3));
    lcd.setCursor(1,0);
    lcd.write(byte(4));
    lcd.setCursor(2,0);
    lcd.write(byte(5));
    lcd.setCursor(3,0);
    lcd.write(byte(6));
    lcd.setCursor(3,1);
    lcd.write(byte(7));
    lcd.setCursor(2,1);
    lcd.write(byte(8));
    

    
    lcd.setCursor(5,0);
    lcd.print("Heart Rate");
    lcd.setCursor(5,1);
    lcd.print(": ");
    lcd.print(myBPM);
    lcd.print(" ");
    lcd.print("BPM     ");


    digitalWrite(4, HIGH);
    
    wait = 0; 
  }
 
  if(BPM==0)
  {
    digitalWrite(4, HIGH);
  }
  else
  {
    digitalWrite(4, LOW);
  }
  
  delay(1200);
}