1. #include <ESP8266WiFi.h>
2. #include <ESP8266WebServer.h>
3. #include <WiFiClient.h>
4. #include <OneWire.h>
5. #include <DallasTemperature.h>
6.  
7.  
8. //------------------------------------------
9. //DS18B20
10. #define ONE_WIRE_BUS D3 //Pin to which is attached a temperature sensor
11. #define ONE_WIRE_MAX_DEV 15 //The maximum number of devices
12.  
13. const int led = 2;
14.  
15. void handleLED();
16.  
17. OneWire oneWire(ONE_WIRE_BUS);
18. DallasTemperature DS18B20(&oneWire);
19. int numberOfDevices; //Number of temperature devices found
20. DeviceAddress devAddr[ONE_WIRE_MAX_DEV];  //An array device temperature sensors
21. float tempDev[ONE_WIRE_MAX_DEV]; //Saving the last measurement of temperature
22. float tempDevLast[ONE_WIRE_MAX_DEV]; //Previous temperature measurement
23. long lastTemp; //The last measurement
24. const int durationTemp = 5000; //The frequency of temperature measurement
25.  
26. //------------------------------------------
27. //WIFI
28. const char* ssid = "esp";
29. const char* password = "haslo8266";
30.  
31. //------------------------------------------
32. //HTTP
33. ESP8266WebServer server(80);
34.  
35. //------------------------------------------
36. //Convert device id to String
37. String GetAddressToString(DeviceAddress deviceAddress){
38.   String str = "";
39.   for (uint8_t i = 0; i < 8; i++){
40.     if( deviceAddress[i] < 16 ) str += String(0, HEX);
41.     str += String(deviceAddress[i], HEX);
42.   }
43.   return str;
44. }
45.  
46. //Setting the temperature sensor
47. void SetupDS18B20(){
48.   DS18B20.begin();
49.  
50.   Serial.print("Parasite power is: ");
51.   if( DS18B20.isParasitePowerMode() ){
52.     Serial.println("ON");
53.   }else{
54.     Serial.println("OFF");
55.   }
56.  
57.   numberOfDevices = DS18B20.getDeviceCount();
58.   Serial.print( "Device count: " );
59.   Serial.println( numberOfDevices );
60.  
61.   lastTemp = millis();
62.   DS18B20.requestTemperatures();
63.  
64.   // Loop through each device, print out address
65.   for(int i=0;i<numberOfDevices; i++){
66.     // Search the wire for address
67.     if( DS18B20.getAddress(devAddr[i], i) ){
68.       //devAddr[i] = tempDeviceAddress;
69.       Serial.print("Found device ");
70.       Serial.print(i, DEC);
71.       Serial.print(" with address: " + GetAddressToString(devAddr[i]));
72.       Serial.println();
73.     }else{
74.       Serial.print("Found ghost device at ");
75.       Serial.print(i, DEC);
76.       Serial.print(" but could not detect address. Check power and cabling");
77.     }
78.  
79.     //Get resolution of DS18b20
80.     Serial.print("Resolution: ");
81.     Serial.print(DS18B20.getResolution( devAddr[i] ));
82.     Serial.println();
83.  
84.     //Read temperature from DS18b20
85.     float tempC = DS18B20.getTempC( devAddr[i] );
86.     Serial.print("Temp C: ");
87.     Serial.println(tempC);
88.   }
89. }
90.  
91. //Loop measuring the temperature
92. void TempLoop(long now){
93.   if( now - lastTemp > durationTemp ){ //Take a measurement at a fixed time (durationTemp = 5000ms, 5s)
94.     for(int i=0; i<numberOfDevices; i++){
95.       float tempC = DS18B20.getTempC( devAddr[i] ); //Measuring temperature in Celsius
96.       tempDev[i] = tempC; //Save the measured value to the array
97.     }
98.     DS18B20.setWaitForConversion(false); //No waiting for measurement
99.     DS18B20.requestTemperatures(); //Initiate the temperature measurement
100.     lastTemp = millis();  //Remember the last time measurement
101.   }
102. }
103.  
104. //------------------------------------------
105. void HandleRoot(){
106.   String message = "Number of devices: ";
107.   message += numberOfDevices;
108.   message += "rn<br>";
109.   char temperatureString[6];
110.  
111.   message += "<table border='1'>rn";
112.   message += "<tr><td>Device id</td><td>Temperature</td></tr>rn";
113.   message += "<button type="button" onclick="alert('Hello world!')">Leds on!</button>";
114.   //<form action="http://google.com">
115.    //<input type="submit" value="Go to Google" /> </form>
116.   message += "<form action="/LED" method="POST"><input type="submit" value="Toggle LED"></form>";
117.   for(int i=0;i<numberOfDevices;i++){
118.     dtostrf(tempDev[i], 2, 2, temperatureString);
119.     Serial.print( "Sending temperature: " );
120.     Serial.println( temperatureString );
121.  
122.     message += "<tr><td>";
123.     message += GetAddressToString( devAddr[i] );
124.     message += "</td>rn";
125.     message += "<td>";
126.     message += temperatureString;
127.     message += "</td></tr>rn";
128.     message += "rn";
129.   }
130.   message += "</table>rn";
131.  
132.   server.send(200, "text/html", message );
133. }
134.  
135. void HandleNotFound(){
136.   String message = "File Not Foundnn";
137.   message += "URI: ";
138.   message += server.uri();
139.   message += "nMethod: ";
140.   message += (server.method() == HTTP_GET)?"GET":"POST";
141.   message += "nArguments: ";
142.   message += server.args();
143.   message += "n";
144.   for (uint8_t i=0; i<server.args(); i++){
145.     message += " " + server.argName(i) + ": " + server.arg(i) + "n";
146.   }
147.   server.send(404, "text/html", message);
148. }
149.  
150.  
151. //------------------------------------------
152. void setup() {
153.   //Setup Serial port speed
154.   Serial.begin(115200);
155.  
156.   //Setup WIFI
157.   WiFi.begin(ssid, password);
158.   Serial.println("");
159.  
160.   //Wait for WIFI connection
161.   while (WiFi.status() != WL_CONNECTED) {
162.     delay(500);
163.     Serial.print(".");
164.   }
165.   Serial.println("");
166.   Serial.print("Connected to ");
167.   Serial.println(ssid);
168.   Serial.print("IP address: ");
169.   Serial.println(WiFi.localIP());
170.  
171.   server.on("/", HandleRoot);
172.   server.on("/LEDon", handleLEDOn);
173.   server.on("/LEDoff", handleLEDOff);
174.  
175.  
176.   server.onNotFound( HandleNotFound );
177.   server.begin();
178.   Serial.println("HTTP server started at ip " + WiFi.localIP().toString() );
179.  
180.   //Setup DS18b20 temperature sensor
181.   SetupDS18B20();
182.  
183. }
184.  
185. void loop() {
186.   long t = millis();
187.  
188.   server.handleClient();
189.   TempLoop( t );
190. }
191. void handleLEDOn() {                          // If a POST request is made to URI /LED
192.   digitalWrite(led,!digitalRead(led));      // Change the state of the LED
193.   server.sendHeader("Location","/");        // Add a header to respond with a new location for the browser to go to the home page again
194.   server.send(303);                         // Send it back to the browser with an HTTP status 303 (See Other) to redirect
195. }
196.  
197.  
198.