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

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

WiFiClient client;

unsigned long myChannelNumber = 2;
char myAPIKey[] = "9EWUJ8MUBZUFH935";
char server[] = "api.thingspeak.com";

unsigned long lastTime = 0;
unsigned long timerDelay = 30000;

int tempC;
int humi;

#define DHTPIN 15    // Chân dữ liệu của DHT11, với NodeMCU chân D5 GPIO là 14
#define DHTTYPE DHT22   // DHT22
#define LED 18

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(115200);
  delay(1000);
  pinMode(LED, OUTPUT);
  WiFi.begin(ssid, pass);
  Serial.print("Connecting ...");
  while (WiFi.status() != WL_CONNECTED) {
    Serial.print(".");
    delay(100);
  }

  Serial.println("");
  Serial.println("Connected !!!");
  Serial.println(WiFi.localIP());

  WiFi.mode(WIFI_STA);
  ThingSpeak.begin(client);
  dht.begin();
}

void loop() {
  float h = dht.readHumidity();
  float t = dht.readTemperature();  // Đọc nhiệt độ theo độ C

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

  Serial.print("Temp: ");
  Serial.print(t);
  Serial.print(" °C  ");
  Serial.print("Humi: ");
  Serial.print(h);
  Serial.println(" %");
  if(t>30){
    digitalWrite(LED,HIGH);}
  else{
    digitalWrite(LED,LOW);}

  ThingSpeak.setField(1, tempC);
  ThingSpeak.setField(2, humi);

  int x = ThingSpeak.writeFields(myChannelNumber,myAPIKey);
  if(x == 200){
    Serial.println("Channel update successful.");
  }else {Serial.println("Problem updating channel. HTTP error code " + String(x));}
  delay(100);
}