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

#define DHTPIN 13  
#define DHTTYPE DHT22  

char ssid[] = "Wokwi-GUEST";   
char pass[] = "";  

unsigned long myChannelNumber = 2549032;
const char * myWriteAPIKey = "ZRX7D59HRL9767W3";

WiFiClient client;
DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(9600);
  delay(1000);
  dht.begin();
}

void loop() {
  if(WiFi.status() != WL_CONNECTED){
    Serial.print("Attempting to connect to SSID: ");
    Serial.println(ssid);
    while(WiFi.status() != WL_CONNECTED){
      WiFi.begin(ssid, pass);  
      Serial.print(".");
      delay(5000);    
    }
    Serial.println("\nConnected.");
  }

  WiFi.mode(WIFI_STA);  
  ThingSpeak.begin(client);
  
  float h = dht.readHumidity();
  float t = dht.readTemperature();  
 
  if (isnan(h) || isnan(t)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  Serial.print("Nhiet do: ");
  Serial.print(t);
  Serial.print("*C  ");
  Serial.print("Do am: ");
  Serial.print(h);
  Serial.println("%  ");
  
  int mq135 = analogRead(34);

  Serial.print("KK : ");
  Serial.println(mq135);

  ThingSpeak.setField(1, t);
  ThingSpeak.setField(2, h);

  int x = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);
  if(x == 200){
    Serial.println("Channel update successful.");
  }
  else{
    Serial.println("Problem updating channel. HTTP error code " + String(x));
  }
  Serial.print("Complete Update\n");
  delay(200);
}