#include <WiFi.h>
#include <HTTPClient.h>
#include "DHT.h"

#define DHTPIN 15
#define DHTTYPE DHT22

const char* ssid = "Wokwi-GUEST";      // Wokwi simulated WiFi SSID
const char* password = "";              // No password for Wokwi-GUEST

String server = "http://api.thingspeak.com/update?api_key=WM7B7EEKXLB0ZABA";

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(115200);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\nConnected to WiFi");
  dht.begin();
}

void loop() {
  if (WiFi.status() == WL_CONNECTED) {
    HTTPClient http;

    float temperature = dht.readTemperature();
    float humidity = dht.readHumidity();

    // Check if reads failed and skip upload if so
    if (isnan(temperature) || isnan(humidity)) {
      Serial.println("Failed to read from DHT sensor");
      delay(2000);
      return;
    }

    String url = server + "&field1=" + String(temperature) + "&field2=" + String(humidity);

    http.begin(url);  // Specify destination for HTTP request
    int httpResponseCode = http.GET();

    if (httpResponseCode > 0) {
      Serial.println("Data sent to ThingSpeak");
    } else {
      Serial.printf("Error sending data: %d\n", httpResponseCode);
    }

    http.end(); // Free resources
  }
  delay(20000);  // ThingSpeak requires 15 seconds minimum interval between updates
}