#include <ThingSpeak.h>     // ThingSpeak library
#include <DHT.h>            // DHT sensor library

// ThingSpeak settings
unsigned long myChannelNumber = 2805623;  // Replace with your ThingSpeak channel number
const char* myWriteAPIKey = "X6ICWS7J3M2X6Z80";     // Replace with your ThingSpeak Write API Key

// DHT sensor settings
#define DHT_PIN 23     // DHT22 data pin connected to GPIO 23
#define DHT_TYPE DHT22 // DHT sensor type (DHT22)

DHT dht(DHT_PIN, DHT_TYPE);

WiFiClient client;  // Wi-Fi client for ThingSpeak

void setup() {
  Serial.begin(115200);

  // Initialize DHT sensor
  dht.begin();

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

  // Initialize ThingSpeak
  ThingSpeak.begin(client);
}

void loop() {
  // Read temperature and humidity from DHT sensor
  float temperature = dht.readTemperature();  // Read temperature in Celsius
  float humidity = dht.readHumidity();        // Read humidity

  // Check if any reads failed and exit early (to try again)
  if (isnan(temperature) || isnan(humidity)) {
    Serial.println("Failed to read from DHT sensor!");
    delay(2000);
    return;
  }

  // Print temperature and humidity
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println(" °C");
  Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.println(" %");

  // Send data to ThingSpeak
  if (WiFi.status() == WL_CONNECTED) {
    int field1 = temperature;  // Field 1 for temperature
    int field2 = humidity;     // Field 2 for humidity
    int result = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey, field1, field2);
    if (result == 200) {
      Serial.println("Data sent to ThingSpeak successfully.");
    } else {
      Serial.print("Error sending data to ThingSpeak. HTTP error code: ");
      Serial.println(result);
    }
  } else {
    Serial.println("Wi-Fi disconnected. Reconnecting...");
    WiFi.begin(ssid, password);
  }

  // Delay before next ThingSpeak update (15 seconds minimum)
  delay(15000);
}