#include <Wire.h>
#include "MAX30100_PulseOximeter.h"
#include <LiquidCrystal_I2C.h>
#define REPORTING_PERIOD_MS     1000
LiquidCrystal_I2C lcd(0x27, 16, 2);

PulseOximeter pox;

uint32_t tsLastReport = 0;
int Buzzer = 4;
int LED = 18 ;

void onBeatDetected()
{
  Serial.println("Beat!");
}

void setup()
{
  lcd.init();
  lcd.backlight();
  Serial.begin(115200);
  Wire.begin();
  pinMode(Buzzer, OUTPUT);
  pinMode(LED, OUTPUT);
  Serial.print("Initializing pulse oximeter..");

  if (!pox.begin()) {
    Serial.println("FAILED");
    for (;;);
  } else {
    Serial.println("SUCCESS");
  }

  pox.setOnBeatDetectedCallback(onBeatDetected);
}

void loop()
{
  pox.update();
  if (millis() - tsLastReport > REPORTING_PERIOD_MS)
  {
    int hR = pox.getHeartRate();
    int oR = pox.getSpO2();
    Serial.print("Heart rate:");
    Serial.print(hR);
    Serial.print("bpm / O2:");
    Serial.print(oR);
    Serial.println("%");
    lcd.setCursor(0, 0); // positionner le cursor a 0,0
    lcd.print("Heart rate:"); // Printe "Distance" sur LCD
    lcd.print(hR);
    lcd.setCursor(0, 1); // positionner le cursor a 0,0
    lcd.print("O2:"); // Printe "Distance" sur LCD
    lcd.print(oR);
    if (pox.getSpO2() == 0)
    {
      digitalWrite(Buzzer, LOW);
      digitalWrite(LED, LOW);
    }
    else  if (pox.getSpO2() >= 95)
    {
      digitalWrite(Buzzer, LOW);
      digitalWrite(LED, LOW);

    }
    else if (pox.getSpO2() < 95 && pox.getSpO2() > 0)
    {
      digitalWrite(Buzzer, HIGH);
      digitalWrite(LED, HIGH);


    } tsLastReport = millis();
  }
}