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

const char* ssid = "Wokwi-GUEST";
const char* password = "" ;
#define DHTPIN 27     // Digital pin connected to the DHT sensor
 
#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321
 
DHT dht(DHTPIN, DHTTYPE);
String UrlThingspeak = "https://api.thingspeak.com/update?api_key=N4TG1ZJPUP6WAQKK";
 
String httpGETRequest(const char* Url);
void setup() {
  Serial.begin(115200);
  Serial.println(F("DHTxx to Thingspeak!"));
 
  dht.begin();
    //setup wifi
  WiFi.begin(ssid,password);
  Serial.println("conecting");
  while(WiFi.status() != WL_CONNECTED){
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.print("Connected to WiFi network with IP Address: ");
  Serial.println(WiFi.localIP());
}
 
void loop() {
  // Wait a few seconds between measurements.
  delay(10000);
  float h = dht.readHumidity();
  // Read temperature as Celsius (the default)
  float t = dht.readTemperature();
  // Check if any reads failed and exit early (to try again).
  if (isnan(h) || isnan(t)) {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }
  Serial.print(F("Humidity: "));
  Serial.print(h);
  Serial.println(" %");
  Serial.print(F("Temperature: "));
  Serial.print(t);
  Serial.println(" oC");
  char para[50];
  sprintf(para,"&field1=%.2f&field2=%.2f",t,h);
  String Url = UrlThingspeak + String(para);
  Serial.println(Url);
  httpGETRequest(Url.c_str());
}
 
String httpGETRequest(const char* Url){
  HTTPClient http;
  http.begin(Url);
  int responseCode = http.GET();
  String responseBody = "{}";
  if(responseCode > 0){
    Serial.print("responseCode:");
    Serial.println(responseCode);
    responseBody = http.getString();
  }
  else{
    Serial.print("Error Code: ");
    Serial.println(responseCode);
  }
  http.end();
  return responseBody;
}