/*
 * DHT22 Temperature and Humidity Sensor with ESP32
 * Wokwi Simulator Version - No breadboard needed!
 * 
 * Connections in Wokwi:
 * DHT22 VCC → ESP32 3V3
 * DHT22 SDA → ESP32 GPIO 4
 * DHT22 GND → ESP32 GND
 */

#include <DHT.h>

// Define the pin and sensor type
#define DHTPIN 4        // GPIO pin connected to DHT22 data pin
#define DHTTYPE DHT22   // DHT22 sensor type

// Create DHT object
DHT dht(DHTPIN, DHTTYPE);

void setup() {
  // Initialize serial communication
  Serial.begin(115200);
  
  // Initialize the DHT sensor
  dht.begin();
  
  // Print startup message
  Serial.println("=================================");
  Serial.println("   DHT22 Sensor - Wokwi Demo");
  Serial.println("=================================");
  Serial.println("🚀 Starting sensor...");
  
  // Wait for sensor to stabilize
  delay(2000);
  Serial.println("✅ Sensor initialized successfully!");
  Serial.println();
}

void loop() {
  // Read humidity and temperature
  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();        // Celsius
  float temperatureF = dht.readTemperature(true);   // Fahrenheit
  
  // Check if any reads failed
  if (isnan(humidity) || isnan(temperature) || isnan(temperatureF)) {
    Serial.println("❌ ERROR: Failed to read from DHT sensor!");
    delay(2000);
    return;
  }
  
  // Calculate heat index (feels like temperature)
  float heatIndexC = dht.computeHeatIndex(temperature, humidity, false);
  float heatIndexF = dht.computeHeatIndex(temperatureF, humidity);
  
  // Calculate dew point
  float dewPoint = temperature - ((100 - humidity) / 5.0);
  
  // Print results with nice formatting
  Serial.println("📊 ========== SENSOR READINGS ==========");
  Serial.println();
  
  Serial.print("🌡️  Temperature: ");
  Serial.print(temperature, 1);
  Serial.print(" °C  (");
  Serial.print(temperatureF, 1);
  Serial.println(" °F)");
  
  Serial.print("💧 Humidity:    ");
  Serial.print(humidity, 1);
  Serial.println(" %");
  
  Serial.print("🔥 Heat Index:   ");
  Serial.print(heatIndexC, 1);
  Serial.print(" °C  (");
  Serial.print(heatIndexF, 1);
  Serial.println(" °F)");
  
  Serial.print("💎 Dew Point:    ");
  Serial.print(dewPoint, 1);
  Serial.println(" °C");
  
  // Comfort level indicator
  Serial.print("😊 Comfort:      ");
  if (temperature >= 20 && temperature <= 26 && humidity >= 40 && humidity <= 60) {
    Serial.println("COMFORTABLE 😊");
  } else if (temperature > 30) {
    Serial.println("TOO HOT 🥵");
  } else if (temperature < 18) {
    Serial.println("TOO COLD 🥶");
  } else if (humidity > 70) {
    Serial.println("TOO HUMID 💦");
  } else if (humidity < 30) {
    Serial.println("TOO DRY 🏜️");
  } else {
    Serial.println("MODERATE 😐");
  }
  
  Serial.println("=========================================");
  Serial.println();
  
  // Wait 3 seconds before next reading
  delay(3000);
}