#include <WiFi.h>
#include <WiFiClientSecure.h>
#include <DHT.h>

#define DHTPIN 4     // Pin data sensor DHT22 terhubung ke pin 1
#define DHTTYPE DHT22   // Tipe sensor DHT

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

const char *host = "api.thingspeak.com";
const char *apiKey = "JZMHOYH7J03IH33C";

DHT dht(DHTPIN, DHTTYPE);

WiFiClient client;
const int httpPort = 80;

void setup() {
  Serial.begin(115200);
  delay(10);

  // Initialize DHT sensor
  dht.begin();

  // Connect to WiFi
  connectToWiFi();
}

void loop() {
  delay(2000);  // Minimum 2-second delay between temperature readings

  // Read temperature from DHT sensor
  float temperature = dht.readTemperature();

  if (isnan(temperature)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  Serial.print("Current temperature: ");
  Serial.println(temperature);

  // Send data to ThingSpeak
  if (sendDataToThingSpeak(temperature)) {
    Serial.println("Data sent to ThingSpeak successfully!");
  } else {
    Serial.println("Failed to send data to ThingSpeak!");
  }
}

void connectToWiFi() {
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);

  WiFi.begin(ssid, password);

  int attempts = 0;
  while (WiFi.status() != WL_CONNECTED && attempts < 20) {
    delay(500);
    Serial.print(".");
    attempts++;
  }

  if (WiFi.status() == WL_CONNECTED) {
    Serial.println("");
    Serial.println("WiFi connected");
  } else {
    Serial.println("");
    Serial.println("Failed to connect to WiFi. Please check your credentials.");
    // You may add additional actions here if needed
  }
}

bool sendDataToThingSpeak(float temperature) {
  if (client.connect(host, httpPort)) {
    String url = "/update?api_key=";
    url += apiKey;
    url += "&field1=";
    url += String(temperature);
    url += "\r\n";

    Serial.print("Requesting URL: ");
    Serial.println(url);

    client.print(String("GET ") + url + " HTTP/1.1\r\n" +
                 "Host: " + host + "\r\n" +
                 "Connection: close\r\n\r\n");

    delay(10);

    client.stop();
    return true;
  } else {
    Serial.println("Failed to connect to ThingSpeak!");
    return false;
  }
}