#include <WiFi.h> 
#include <DHT.h> 
 
#define DHTPIN 5                   // DHT data pin connected to ESP32 pin 5 
#define DHTTYPE DHT11              // DHT11 (DHT Sensor Type) 
#define SSID "6005"                // WiFi Name 
#define PASS "12345678"            // Password 
#define WRITE_API_KEY "JJ98J2RWY7I3S9HX" // ThingSpeak Write API key 
#define READ_API_KEY "AT8KEV6YJXCZ35SP" // ThingSpeak Read API key (for private channels) 
#define CHANNEL_ID "2713998"     // ThingSpeak Channel ID 
#define THINGSPEAK_URL "api.thingspeak.com" 
 
DHT dht(DHTPIN, DHTTYPE);          // Initialize the DHT sensor 
 
void setup() { 
    Serial.begin(115200);          // Start Serial Monitor 
    dht.begin();                   // Initialize DHT sensor 
    WiFi.begin(SSID, PASS);        // Connect to WiFi 
 
    Serial.print("Connecting to WiFi"); 
    unsigned long startAttemptTime = millis(); 
 
    // Check connection with a timeout 
    while (WiFi.status() != WL_CONNECTED && millis() - startAttemptTime < 10000) { 
        delay(500); 
        Serial.print("."); 
    } 
 
    if (WiFi.status() == WL_CONNECTED) { 
        Serial.println("\nConnected to WiFi"); 
    } else { 
        Serial.println("\nFailed to connect to WiFi"); 
    } 
} 
 
void sendDataToThingSpeak(float temp, float hum) { 
    // Prepare HTTP request URL for sending data 
    String url = "/update?api_key=" + String(WRITE_API_KEY) + "&field1=" + String(temp) + 
"&field2=" + String(hum); 
    Serial.print("Sending data: "); 
    Serial.println(url); 
 
    // Send data to ThingSpeak 
    WiFiClient client; 
    if (client.connect(THINGSPEAK_URL, 80)) { 
        client.print("GET " + url + " HTTP/1.1\r\n"); 
        client.print("Host: " THINGSPEAK_URL "\r\n"); 
        client.print("User-Agent: ESP32Client\r\n"); 
        client.print("Connection: close\r\n\r\n"); 
 
        // Wait for a response from the server 
        while (client.available() == 0) { 
            delay(100); 
        } 
 
        // Read and display the response 
        while (client.available()) { 
            String line = client.readStringUntil('\n'); 
            Serial.println(line); 
        } 
    } else { 
        Serial.println("Connection failed"); 
    } 
 
    client.stop(); // Close the connection 
} 
 
void loop() { 
    // Read temperature and humidity 
    float temp = dht.readTemperature(); 
    float hum = dht.readHumidity(); 
 
    // Check if reading was successful 
    if (isnan(temp) || isnan(hum)) { 
        Serial.println("Failed to read from DHT sensor!"); 
        return; 
    } 
 
    // Send data to ThingSpeak 
    sendDataToThingSpeak(temp, hum); 
 
    // Wait for the server to process before the next request 
    delay(20000); // Wait 20 seconds between updates to avoid rate limits 
}