1String myAPIkey = "Your Write API key here";  
2
3#include <SoftwareSerial.h>
4#include   <DHT.h>;
5SoftwareSerial ESP8266(2, 3); // Rx,  Tx
6
7#define DHTTYPE DHT11
8#define   DHTPIN  A0
9
10DHT dht(DHTPIN, DHTTYPE,11);
11float humidity, temp_f;  
12long   writingTimer = 17; 
13long startTime = 0;
14long waitTime = 0;
15
16
17boolean   relay1_st = false; 
18boolean relay2_st = false; 
19unsigned char check_connection=0;
20unsigned   char times_check=0;
21boolean error;
22
23void setup()
24{
25  Serial.begin(9600);   
26  ESP8266.begin(9600); 
27   dht.begin();
28  startTime = millis(); 
29  ESP8266.println("AT+RST");
30   delay(2000);
31  Serial.println("Connecting to Wifi");
32   while(check_connection==0)
33   {
34    Serial.print(".");
35  ESP8266.print("AT+CWJAP=\\"Wifi Network's   name\\",\\"PassWord\\"\
\
36");
37  ESP8266.setTimeout(5000);
38 if(ESP8266.find("WIFI   CONNECTED\
\
39")==1)
40 {
41 Serial.println("WIFI CONNECTED");
42 break;
43   }
44 times_check++;
45 if(times_check>3) 
46 {
47  times_check=0;
48   Serial.println("Trying   to Reconnect..");
49  }
50  }
51}
52
53void loop()
54{
55  waitTime = millis()-startTime;    
56  if (waitTime > (writingTimer*1000)) 
57  {
58    readSensors();
59    writeThingSpeak();
60     startTime = millis();   
61  }
62}
63
64
65void readSensors(void)
66{
67   temp_f = dht.readTemperature();
68  humidity = dht.readHumidity();
69}
70
71
72void   writeThingSpeak(void)
73{
74  startThingSpeakCmd();
75  // preparacao da string   GET
76  String getStr = "GET /update?api_key=";
77  getStr += myAPIkey;
78   getStr +="&field1=";
79  getStr += String(temp_f);
80  getStr +="&field2=";
81   getStr += String(humidity);
82  getStr += "\
\
83\
\
84";
85  GetThingspeakcmd(getStr);   
86}
87
88void startThingSpeakCmd(void)
89{
90  ESP8266.flush();
91  String   cmd = "AT+CIPSTART=\\"TCP\\",\\"";
92  cmd += "184.106.153.149"; // api.thingspeak.com   IP address
93  cmd += "\\",80";
94  ESP8266.println(cmd);
95  Serial.print("Start   Commands: ");
96  Serial.println(cmd);
97
98  if(ESP8266.find("Error"))
99   {
100    Serial.println("AT+CIPSTART error");
101    return;
102  }
103}
104
105String   GetThingspeakcmd(String getStr)
106{
107  String cmd = "AT+CIPSEND=";
108  cmd   += String(getStr.length());
109  ESP8266.println(cmd);
110  Serial.println(cmd);
111
112   if(ESP8266.find(">"))
113  {
114    ESP8266.print(getStr);
115    Serial.println(getStr);
116     delay(500);
117    String messageBody = "";
118    while (ESP8266.available())   
119    {
120      String line = ESP8266.readStringUntil('\
121');
122      if (line.length()   == 1) 
123      { 
124        messageBody = ESP8266.readStringUntil('\
125');
126       }
127    }
128    Serial.print("MessageBody received: ");
129    Serial.println(messageBody);
130     return messageBody;
131  }
132  else
133  {
134    ESP8266.println("AT+CIPCLOSE");      
135    Serial.println("AT+CIPCLOSE"); 
136  } 
137}

1String myAPIkey = "Your Write API key here";  
2
3#include <SoftwareSerial.h>
4#include
5  <DHT.h>;
6SoftwareSerial ESP8266(2, 3); // Rx,  Tx
7
8#define DHTTYPE DHT11
9#define
10  DHTPIN  A0
11
12DHT dht(DHTPIN, DHTTYPE,11);
13float humidity, temp_f;  
14long
15  writingTimer = 17; 
16long startTime = 0;
17long waitTime = 0;
18
19
20boolean
21  relay1_st = false; 
22boolean relay2_st = false; 
23unsigned char check_connection=0;
24unsigned
25  char times_check=0;
26boolean error;
27
28void setup()
29{
30  Serial.begin(9600);
31  
32  ESP8266.begin(9600); 
33   dht.begin();
34  startTime = millis(); 
35  ESP8266.println("AT+RST");
36
37  delay(2000);
38  Serial.println("Connecting to Wifi");
39   while(check_connection==0)
40
41  {
42    Serial.print(".");
43  ESP8266.print("AT+CWJAP=\\"Wifi Network's
44  name\\",\\"PassWord\\"\
\
45");
46  ESP8266.setTimeout(5000);
47 if(ESP8266.find("WIFI
48  CONNECTED\
\
49")==1)
50 {
51 Serial.println("WIFI CONNECTED");
52 break;
53
54  }
55 times_check++;
56 if(times_check>3) 
57 {
58  times_check=0;
59   Serial.println("Trying
60  to Reconnect..");
61  }
62  }
63}
64
65void loop()
66{
67  waitTime = millis()-startTime;
68   
69  if (waitTime > (writingTimer*1000)) 
70  {
71    readSensors();
72    writeThingSpeak();
73
74    startTime = millis();   
75  }
76}
77
78
79void readSensors(void)
80{
81
82  temp_f = dht.readTemperature();
83  humidity = dht.readHumidity();
84}
85
86
87void
88  writeThingSpeak(void)
89{
90  startThingSpeakCmd();
91  // preparacao da string
92  GET
93  String getStr = "GET /update?api_key=";
94  getStr += myAPIkey;
95
96  getStr +="&field1=";
97  getStr += String(temp_f);
98  getStr +="&field2=";
99
100  getStr += String(humidity);
101  getStr += "\
\
102\
\
103";
104  GetThingspeakcmd(getStr);
105  
106}
107
108void startThingSpeakCmd(void)
109{
110  ESP8266.flush();
111  String
112  cmd = "AT+CIPSTART=\\"TCP\\",\\"";
113  cmd += "184.106.153.149"; // api.thingspeak.com
114  IP address
115  cmd += "\\",80";
116  ESP8266.println(cmd);
117  Serial.print("Start
118  Commands: ");
119  Serial.println(cmd);
120
121  if(ESP8266.find("Error"))
122
123  {
124    Serial.println("AT+CIPSTART error");
125    return;
126  }
127}
128
129String
130  GetThingspeakcmd(String getStr)
131{
132  String cmd = "AT+CIPSEND=";
133  cmd
134  += String(getStr.length());
135  ESP8266.println(cmd);
136  Serial.println(cmd);
137
138
139  if(ESP8266.find(">"))
140  {
141    ESP8266.print(getStr);
142    Serial.println(getStr);
143
144    delay(500);
145    String messageBody = "";
146    while (ESP8266.available())
147  
148    {
149      String line = ESP8266.readStringUntil('\
150');
151      if (line.length()
152  == 1) 
153      { 
154        messageBody = ESP8266.readStringUntil('\
155');
156
157      }
158    }
159    Serial.print("MessageBody received: ");
160    Serial.println(messageBody);
161
162    return messageBody;
163  }
164  else
165  {
166    ESP8266.println("AT+CIPCLOSE");
167     
168    Serial.println("AT+CIPCLOSE"); 
169  } 
170}