#define BLYNK_PRINT Serial

// Blynk Template Info
#define BLYNK_TEMPLATE_ID "TMPL6fiswaZrb"
#define BLYNK_TEMPLATE_NAME "Healthcare IoT"
#define BLYNK_AUTH_TOKEN "tOdUkWlCorOI8_TgdOGSy5LUwmzyYzzb"

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

// Credentials
char auth[] = "tOdUkWlCorOI8_TgdOGSy5LUwmzyYzzb";
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

// Pin Definitions
#define DHTPIN 4     
#define DHTTYPE DHT22
#define LED_PIN 5      
#define BUTTON_PIN 13  
#define LDR_PIN 32     
#define OXYGEN_PIN 33  

DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x27, 16, 2); 

// Variables
double temp;
double hum; // New Humidity variable
int heartRate;
int oxygen;
BlynkTimer timer;

void setup() {
  Serial.begin(115200);
  dht.begin();
  lcd.init();
  lcd.backlight();
  
  Blynk.begin(auth, ssid, pass);
  timer.setInterval(2000L, sendData);
}

void sendData() {
  // Read Sensors
  temp = dht.readTemperature();
  hum = dht.readHumidity(); // New: Read Humidity
  int lightLevel = analogRead(LDR_PIN);
  int oxyLevel = analogRead(OXYGEN_PIN);

  // Map values
  heartRate = map(lightLevel, 0, 4095, 60, 100);
  oxygen = map(oxyLevel, 0, 4095, 90, 100);

  if (isnan(temp) || isnan(hum)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  // LCD Layout (showing 4 values using abbreviations)
  // Line 1: Temp and Humidity
  lcd.setCursor(0, 0);
  lcd.print("T:"); lcd.print((int)temp); lcd.print("C ");
  lcd.print("H:"); lcd.print((int)hum); lcd.print("%  ");
  
  // Line 2: Heart Rate and Oxygen
  lcd.setCursor(0, 1);
  lcd.print("HR:"); lcd.print(heartRate);
  lcd.print(" Ox:"); lcd.print(oxygen); lcd.print("% ");

  // Send to Blynk
  Blynk.virtualWrite(V0, temp);      
  Blynk.virtualWrite(V1, heartRate); 
  Blynk.virtualWrite(V2, oxygen);    
  Blynk.virtualWrite(V3, hum);       // New: Send Humidity to V3
  
  Serial.println("All Health Data Sent");
}

void loop() {
  Blynk.run();
  timer.run();

  if (temp > 37.0) {
    digitalWrite(LED_PIN, HIGH);
  } else {
    digitalWrite(LED_PIN, LOW);
  }
}