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

#define DHTPIN 15
#define DHTTYPE DHT22
#define LEDPIN 2   // LED on GPIO 2

const char* ssid = "Wokwi-GUEST";
const char* password = "";

String server = "http://api.thingspeak.com/update?api_key=8BIT79HNKE0H5PXF";

DHT dht(DHTPIN, DHTTYPE);

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

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

  dht.begin();

  // LED setup
  pinMode(LEDPIN, OUTPUT);
  digitalWrite(LEDPIN, LOW);  // start OFF
}

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

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

    Serial.print("Temp: ");
    Serial.print(temperature);
    Serial.print(" °C, Humidity: ");
    Serial.print(humidity);
    Serial.println(" %");

    // Threshold LED action
    if (temperature > 30) {
      digitalWrite(LEDPIN, HIGH);  // turn ON
      Serial.println("LED ON - Temp too high!");
    } else {
      digitalWrite(LEDPIN, LOW);   // turn OFF
    }

    // Send to ThingSpeak
    String url = server + "&field1=" + String(temperature) + "&field2=" + String(humidity);
    http.begin(url.c_str());
    int httpResponseCode = http.GET();
    if (httpResponseCode > 0) {
      Serial.println("Data sent to ThingSpeak");
    } else {
      Serial.println("Error sending data");
    }
    http.end();
  }

  delay(20000); // ThingSpeak requires 15s minimum interval
}