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1#include <Wire.h>
2#include <ESP8266WiFi.h>
3#include <Adafruit_Sensor.h>
4#include <Adafruit_BME280.h>
5
6Adafruit_BME280 bme; // I2C
7
8float h, t, p, pin, dp;
9char temperatureString[6];
10char dpString[6];
11char humidityString[6];
12char pressureString[7];
13char pressureInchString[6];
14unsigned long delayTime;
15
16// replace with you First Channel ThingSpeak Write API key
17String apiKey = "api key";
18// replace with your local network SSID
19const char* ssid = "Naziv mreze";
20// replace with your local network password
21const char* password = "lozinka";
22const char* server = "api.thingspeak.com";
23
24WiFiClient client;
25
26// only runs once on boot
27void setup() {
28  // Initializing serial port for debugging purposes
29   Serial.begin(115200);
30  delay(10);
31  Wire.begin(D2, D1); // Make sure you have D3(SDA) & D4 (SCL) hooked up to the BME280 SENSOR
32  Wire.setClock(100000);
33  // Connecting to WiFi network
34  Serial.println();
35  Serial.print("Connecting to ");
36  Serial.println(ssid);
37  
38  WiFi.begin(ssid, password);
39  
40  while (WiFi.status() != WL_CONNECTED) {
41    delay(500);
42    Serial.print(".");
43  }
44  Serial.println("");
45  Serial.println("WiFi connected");
46  
47    // Printing the ESP IP address
48  Serial.println(WiFi.localIP());
49
50  if (!bme.begin()) {
51    Serial.println("Could not find a valid BME280 sensor, check wiring!");
52    while (1);
53  }
54}
55
56void loop() {
57    h = bme.readHumidity();
58    t = bme.readTemperature();//temperature in Celcius
59    //t = t*1.8+32.0; //uncomment if you want to get temperature in Fahrenheit
60    dp = t-0.36*(100.0-h);
61    
62    p = bme.readPressure()/100.0F;
63    pin = 0.02953*p;
64    dtostrf(t, 5, 1, temperatureString);
65    dtostrf(h, 5, 1, humidityString);
66    dtostrf(p, 6, 1, pressureString);
67    dtostrf(pin, 5, 2, pressureInchString);
68    dtostrf(dp, 5, 1, dpString);
69    delay(10000);
70
71    Serial.print("Temperature = ");
72    Serial.println(temperatureString);
73    Serial.print("Humidity = ");
74    Serial.println(humidityString);
75    Serial.print("Pressure = ");
76    Serial.println(pressureString);
77    Serial.print("Pressure Inch = ");
78    Serial.println(pressureInchString);
79    Serial.print("Dew Point = ");
80    Serial.println(dpString);
81    
82    if (client.connect(server,80))  // "184.106.153.149" or api.thingspeak.com
83    {
84        String postStr = apiKey;
85        postStr +="&field1=";
86        postStr += String(temperatureString);
87        postStr +="&field2=";
88        postStr += String(humidityString);
89        postStr +="&field3=";
90        postStr += String(pressureString);
91        //postStr += String(pressureInchString);//uncomment if you need pressure in inch
92        postStr += "\r\n\r\n";
93        
94        client.print("POST /update HTTP/1.1\n");
95        client.print("Host: api.thingspeak.com\n");
96        client.print("Connection: close\n");
97        client.print("X-THINGSPEAKAPIKEY: "+apiKey+"\n");
98        client.print("Content-Type: application/x-www-form-urlencoded\n");
99        client.print("Content-Length: ");
100        client.print(postStr.length());
101        client.print("\n\n");
102        client.print(postStr);    
103    }
104    client.stop(); 
105    //every 30 seconds   
106    delay(30000);
107}