#include <DHTesp.h>
#include <WiFi.h>

String apiKey = "55EWBCMB7O39YMLP";
const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* server = "api.thingspeak.com";
const int httpPort = 80;

#define DHTPIN 23  // Chân kết nối cảm biến DHT22

DHTesp dht;

void setup() {
  Serial.begin(115200);
  delay(10);
  dht.setup(DHTPIN, DHTesp::DHT22);

  Serial.print("Connecting to WiFi");
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(100);
    Serial.print(".");
  }
  Serial.println(" Connected!");
}

void loop() {
  float h = dht.getHumidity();
  float t = dht.getTemperature();

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

  WiFiClient client;
  if (!client.connect(server, httpPort)) {
    Serial.println("Connection failed!");
    return;
  }

  String url = "/update?api_key=" + apiKey + "&field1=" + String(t) + "&field2=" + String(h);
  client.print(String("GET ") + url + " HTTP/1.1\r\n" +
               "Host: " + server + "\r\n" +
               "Connection: close\r\n\r\n");

  Serial.println("Sending data to ThingSpeak...");
  while (client.available()) {
    String line = client.readStringUntil('\r');
    Serial.print(line);
  }
  Serial.println();

  client.stop();
  
  Serial.print("Temperature: ");
  Serial.print(t);
  Serial.print(" degrees Celsius, Humidity: ");
  Serial.print(h);
  Serial.println("%");
  Serial.println("Sent to ThingSpeak.");

  delay(10000); // Minimum 15 seconds delay between updates
}