#define BLYNK_PRINT Serial

#define BLYNK_TEMPLATE_ID "TMPL5A5IKGiWu"
#define BLYNK_TEMPLATE_NAME "IOT Based Health Monitoring System Using ESP32"

#include <WiFi.h>
#include <BlynkSimpleEsp32.h>
#include <DHT.h>
#include <LiquidCrystal_I2C.h>

// Blynk auth token and Wi-Fi credentials
char auth[] = "dPwaOMahpx1KvmMqtQQOg15ZGHRzQDhd";
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

// Defining DHT22 Sensor and pin
#define DHTPIN 4
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

const int ldrPin = 34;
LiquidCrystal_I2C lcd(0x27, 16, 2); // Verified I2C address

double bodyTemperature;
int heartRate;

void setup() {
  Serial.begin(115200);
  Blynk.begin(auth, ssid, pass);

  while (Blynk.connect() == false) {
    Serial.print(".");
    delay(100);
  }
  Serial.println("Connected to Wi-Fi");

  dht.begin();

  lcd.init();  // Initializing the LCD
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("LCD initialized");
  Serial.println("LCD initialized");
}

void loop() {
  Blynk.run();

  // Reading the body temperature as Celsius
  bodyTemperature = dht.readTemperature();
  if (isnan(bodyTemperature)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }
  Serial.print("Temperature: ");
  Serial.println(bodyTemperature);

  // Reading LDR value and mapping it to heart rate (simulating heart rate)
  int lightLevel = analogRead(ldrPin);
  heartRate = map(lightLevel, 0, 4095, 60, 100);
  Serial.print("Heart rate: ");
  Serial.println(heartRate);

  // Sending data to Blynk
  Blynk.virtualWrite(V1, bodyTemperature);
  Blynk.virtualWrite(V2, heartRate);

  // Displaying data on LCD
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(bodyTemperature);
  lcd.print(" C  ");

  lcd.setCursor(0, 1);
  lcd.print("Heart: ");
  lcd.print(heartRate);
  lcd.print(" bpm  ");

  delay(2000);
}