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#include <LiquidCrystal.h>
#include <Wire.h>
#include "MAX30100_PulseOximeter.h"
#include "DHT.h"
LiquidCrystal lcd(19,23,18,17,16,15);
 
#define DHTPIN 25             // Pin where the DHT11 is connected to the ESP32 (change this to your pin number)
#define DHTTYPE DHT11        // Type of the DHT sensor used
 
DHT dht(DHTPIN, DHTTYPE);
 
#define REPORTING_PERIOD_MS     1000
 
// PulseOximeter is the higher level interface to the sensor
// it offers:
//  * beat detection reporting
//  * heart rate calculation
//  * SpO2 (oxidation level) calculation
PulseOximeter pox;
 
uint32_t tsLastReport = 0;
 
// Callback (registered below) fired when a pulse is detected
void onBeatDetected()
{
    Serial.println("Beat!");
}
 
void setup()
{
    Serial.begin(115200);
    Serial.print("Initializing pulse oximeter..");
    lcd.begin(20,4);
    lcd.clear();
    dht.begin();
 
    // Initialize the PulseOximeter instance
    // Failures are generally due to an improper I2C wiring, missing power supply
    // or wrong target chip
    if (!pox.begin()) {
        Serial.println("FAILED");
        for(;;);
    } else {
        Serial.println("SUCCESS");
    }
 
    // The default current for the IR LED is 50mA and it could be changed
    //   by uncommenting the following line. Check MAX30100_Registers.h for all the
    //   available options.
    // pox.setIRLedCurrent(MAX30100_LED_CURR_7_6MA);
 
    // Register a callback for the beat detection
    pox.setOnBeatDetectedCallback(onBeatDetected);
}
 
void loop()
{
    // Make sure to call update as fast as possible
    pox.update();
 
    // Asynchronously dump heart rate and oxidation levels to the serial
    // For both, a value of 0 means "invalid"
    if (millis() - tsLastReport > REPORTING_PERIOD_MS) {
        Serial.print("Heart rate:");
        Serial.print(pox.getHeartRate());
        Serial.print("bpm / SpO2:");
        Serial.print(pox.getSpO2());
        Serial.println("%");
   tsLastReport = millis();
    }
         //delay(2000);     // Delay between sensor readings
 
  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();
 
  if (isnan(humidity) || isnan(temperature)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }
 
  Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.print(" %\t Temperature: ");
  Serial.print(temperature);
  Serial.println(" *C");
 
 
    //lcd.clear();
    lcd.setCursor(0,0); //column,row)
    lcd.print("Place finger firmly");
 
    lcd.setCursor(0,1);
    lcd.print("Heart rate:");
    lcd.setCursor(12,1);
    lcd.print (pox.getHeartRate());
    lcd.setCursor(16,1);
    lcd.print("BPM");
 
    lcd.setCursor(0,2);
    lcd.print("SP02:");
    lcd.setCursor(6,2);
    lcd.print (pox.getSpO2());
     lcd.setCursor(8,2);
    lcd.print("%");
 
    lcd.setCursor(0,3);   // Temp and Humidity sensor display
    lcd.print("Hum:");
    lcd.setCursor(5,3);
    lcd.print(humidity);
    lcd.setCursor(9,3);
    lcd.print("Temp:");
    lcd.setCursor(15,3);
    lcd.print(temperature);
 
 
}
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