#include <ESP32Servo.h>
#include <DHT.h>
#include <WiFi.h> // Use the "WiFi" library for ESP32
#include <ThingSpeak.h>

#define DHTPIN 2      // Define the pin to which the DHT11 sensor is connected
#define DHTTYPE DHT22 // Set the type of DHT sensor you are using

#define SERVO_PIN 4         // Define the pin to which the servo motor is connected
#define TEMP_THRESHOLD 30.0 // Set the temperature threshold in Celsius

DHT dht(DHTPIN, DHTTYPE);
Servo servo;

const char* ssid = "Wokwi-GUEST";     // Your network SSID (name)
const char* password = ""; // Your network password
const unsigned long channelID = 2454872; // Your ThingSpeak Channel ID
const char* writeAPIKey = "XWPM92OI8Z2KNU2W";  // Your ThingSpeak Write API Key

void setup() {
  dht.begin();
  servo.attach(SERVO_PIN);
  Serial.begin(9600);
  servo.write(0); // Close the vent initially (position at 0 degrees)

  // Connect to Wi-Fi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");
}

void loop() {
  delay(2000); // Wait a few seconds between temperature readings

  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();
  int pos = 0;

  if (!isnan(temperature) && !isnan(humidity)) {
    Serial.print("Temperature: ");
    Serial.println(temperature);
    Serial.print("Humidity: ");
    Serial.println(humidity);

    // Create a separate WiFiClient instance for ThingSpeak
    WiFiClient client;
    
    // Send data to ThingSpeak
    ThingSpeak.begin(client);
    ThingSpeak.setField(1, temperature);
    ThingSpeak.setField(2, humidity);
    int x = ThingSpeak.writeFields(channelID, writeAPIKey);
    if (x == 200) {
      Serial.println("Data sent to ThingSpeak");
    } else {
      Serial.println("Problem updating ThingSpeak. HTTP error code " + String(x));
    }

    if (temperature > TEMP_THRESHOLD) {
      Serial.println("Ventilation ON");
      // Temperature exceeds threshold, open the vent
      for (pos = 0; pos <= 180; pos += 1) {
        servo.write(pos);
        delay(15);
      }

      for (pos = 180; pos >= 0; pos -= 1) {
        servo.write(pos);
        delay(15);
      }
    } else {
      // Temperature is below threshold, close the vent
      servo.write(0);
      Serial.println("Ventilation OFF");
    }
  } else {
    Serial.println("Failed to read temperature or humidity from DHT sensor!");
  }
}