#include <DHT.h> #include
<ESP8266WiFi.h>
const char* ssid = "SYS123";
const char* password = "12345678";
String apiKey = "TG2DHQ689TQX9MVV";
const char* server = "api.thingspeak.com";
#define DHTPIN 14
#define DHTTYPE DHT11
DHT dht(DHTPIN, DHTTYPE);
float humidity;
float temp;
WiFiClient client;
void setup() {
  Serial.begin(9600);
  dht.begin(); WiFi.begin(ssid, password);
  Serial.print("Wifi connecting to ...SSID:");
  Serial.println(ssid); Serial.print("connecting");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("Wifi connected successfully");
  Serial.print("nodemcu Ip Adress");
  Serial.println(WiFi.localIP());
}
void loop()
{ temp = dht.readTemperature();
  humidity = dht.readHumidity();
  if (client.connect(server, 80)) {
    String postStr = apiKey;
    postStr += "&field1=";
    postStr += String(temp);
    postStr += "&field2=";
    postStr += String(humidity);
    postStr += "\r\n\r\n";
    client.print("POST /update HTTP/1.1\n");
    client.print("Host: api.thingspeak.com\n");
    client.print("Connection: close\n");
    client.print("X-THINGSPEAKAPIKEY: " + apiKey + "\n");
    client.print("Content-Type: application/x-www-form-urlencoded\n");
    client.print("Content-Length: ");
    client.print(postStr.length());
    client.print("\n\n");
    client.print(postStr);
    delay(1000);
    Serial.print("Temperature = ");
    Serial.println(temp, 2);
    Serial.print("Humidity = ");
    Serial.print(humidity, 2);
    Serial.println (" %");
    Serial.println("Data sent to ThingSpeak");
  }
  client.stop();
  Serial.println("Waiting for 15sec...");
  delay(15000);
}