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1#include <DHT.h>  // Including library for dht
2#include <ESP8266WiFi.h>
3String apiKey = "Your ThingSpeak Write API Key";     //  Enter your Write API key from ThingSpeak
4const char *ssid =  "WiFi Name";     // replace with your wifi ssid and wpa2 key
5const char *pass =  "WiFi Password";
6const char* server = "api.thingspeak.com";
7#define DHTPIN 13          //D7 pin where the dht11 is connected
8DHT dht(DHTPIN, DHT11);
9WiFiClient client;
10void setup() {
11     Serial.begin(115200);
12     delay(10);
13     dht.begin();
14     Serial.println("Connecting to ");
15     Serial.println(ssid);
16     WiFi.begin(ssid, pass);
17     while (WiFi.status() != WL_CONNECTED) 
18     {
19            delay(500);
20            Serial.print(".");
21     }
22      Serial.println("");
23      Serial.println("WiFi connected");
24 
25}
26 
27void loop() 
28{
29  
30      float h = dht.readHumidity();
31      float t = dht.readTemperature();
32      
33              if (isnan(h) || isnan(t)) 
34                 {
35                     Serial.println("Failed to read from DHT sensor!");
36                      return;
37                 }
38
39                         if (client.connect(server,80))   //   "184.106.153.149" or api.thingspeak.com
40                      {  
41                            
42                             String postStr = apiKey;
43                             postStr +="&field1=";
44                             postStr += String(t);
45                             postStr +="&field2=";
46                             postStr += String(h);
47                             postStr += "\r\n\r\n";
48 
49                             client.print("POST /update HTTP/1.1\n");
50                             client.print("Host: api.thingspeak.com\n");
51                             client.print("Connection: close\n");
52                             client.print("X-THINGSPEAKAPIKEY: "+apiKey+"\n");
53                             client.print("Content-Type: application/x-www-form-urlencoded\n");
54                             client.print("Content-Length: ");
55                             client.print(postStr.length());
56                             client.print("\n\n");
57                             client.print(postStr);
58 
59                             Serial.print("Temperature: ");
60                             Serial.print(t);
61                             Serial.print(" degrees Celsius, Humidity: ");
62                             Serial.print(h);
63                             Serial.println("%. Send to Thingspeak.");
64                        }
65          client.stop();
66 
67          Serial.println("Waiting...");
68  
69  // thingspeak needs minimum 15 sec delay between updates, i've set it to 30 seconds
70  delay(15000);
71}