qgHG7cTP

1// Simple code upload the tempeature and humidity data using thingspeak.com
2// Hardware: NodeMCU,DHT11
3
4#include <DHT.h>  // Including library for dht
5
6#include <ESP8266WiFi.h>
7 
8String apiKey = "Yor API Key";     //  Enter your Write API key from ThingSpeak
9
10const char *ssid =  "Your wifi name";     // replace with your wifi ssid and wpa2 key
11const char *pass =  "Your Wifi Password";
12const char* server = "api.thingspeak.com";
13
14#define DHTPIN 0          //pin where the dht11 is connected
15 
16DHT dht(DHTPIN, DHT11);
17
18WiFiClient client;
19 
20void setup() 
21{
22       Serial.begin(115200);
23       delay(10);
24       dht.begin();
25 
26       Serial.println("Connecting to ");
27       Serial.println(ssid);
28 
29 
30       WiFi.begin(ssid, pass);
31 
32      while (WiFi.status() != WL_CONNECTED) 
33     {
34            delay(500);
35            Serial.print(".");
36     }
37      Serial.println("");
38      Serial.println("WiFi connected");
39 
40}
41 
42void loop() 
43{
44  
45      float h = dht.readHumidity();
46      float t = dht.readTemperature();
47      
48              if (isnan(h) || isnan(t)) 
49                 {
50                     Serial.println("Failed to read from DHT sensor!");
51                      return;
52                 }
53
54                         if (client.connect(server,80))   //   "184.106.153.149" or api.thingspeak.com
55                      {  
56                            
57                             String postStr = apiKey;
58                             postStr +="&field1=";
59                             postStr += String(t);
60                             postStr +="&field2=";
61                             postStr += String(h);
62                             postStr += "\r\n\r\n";
63 
64                             client.print("POST /update HTTP/1.1\n");
65                             client.print("Host: api.thingspeak.com\n");
66                             client.print("Connection: close\n");
67                             client.print("X-THINGSPEAKAPIKEY: "+apiKey+"\n");
68                             client.print("Content-Type: application/x-www-form-urlencoded\n");
69                             client.print("Content-Length: ");
70                             client.print(postStr.length());
71                             client.print("\n\n");
72                             client.print(postStr);
73 
74                             Serial.print("Temperature: ");
75                             Serial.print(t);
76                             Serial.print(" degrees Celcius, Humidity: ");
77                             Serial.print(h);
78                             Serial.println("%. Send to Thingspeak.");
79                        }
80          client.stop();
81 
82          Serial.println("Waiting...");
83  
84  // thingspeak needs minimum 15 sec delay between updates, i've set it to 30 seconds
85  delay(10000);
86}