View temp. and humidity from anywhere using ESP8266

1/* Blynk is a platform with iOS and Android apps to control
2 * Arduino,  Raspberry Pi and the likes over the Internet.
3 * You can easily build graphic  interfaces for all your
4 * projects by simply dragging and dropping widgets.
5  *
6 *   Downloads, docs, tutorials: http://www.blynk.cc
7 *   Blynk community:            http://community.blynk.cc
8 *   Social networks:            http://www.fb.com/blynkapp
9  *                               http://twitter.com/blynk_app
10 *
11 * Blynk library  is licensed under MIT license
12 * This example code is in public domain.
13 *
14  **************************************************************
15 * This example  shows how value can be pushed from Arduino to
16 * the Blynk App.
17 *
18 * WARNING  :
19 * For this example you'll need SimpleTimer library:
20 *   https://github.com/jfturcot/SimpleTimer
21  * and Adafruit DHT sensor library:
22 *   https://github.com/adafruit/DHT-sensor-library
23  *
24 * App project setup:
25 *   Value Display widget attached to V5
26 *   Value  Display widget attached to V6
27 *
28 **************************************************************/
29
30#define  BLYNK_PRINT Serial    // Comment this out to disable prints and save space
31#include  <SPI.h>
32#include <ESP8266WiFi.h>       
33#include <BlynkSimpleEsp8266.h>
34#include  <SimpleTimer.h>
35#include <DHT.h>
36
37// You should get Auth Token in the Blynk  App.
38// Go to the Project Settings (nut icon).
39char auth[] = ""; //Enter  the Auth code which was send by Blink
40
41// Your WiFi credentials.
42// Set  password to "" for open networks.
43char ssid[] = "";  //Enter your WIFI Name
44char  pass[] = "";  //Enter your WIFI Password
45
46#define DHTPIN 2          // Digital  pin 4
47
48// Uncomment whatever type you're using!
49#define DHTTYPE DHT11     //  DHT 11
50//#define DHTTYPE DHT22   // DHT 22, AM2302, AM2321
51//#define DHTTYPE  DHT21   // DHT 21, AM2301
52
53DHT dht(DHTPIN, DHTTYPE);
54SimpleTimer timer;
55
56//  This function sends Arduino's up time every second to Virtual Pin (5).
57// In  the app, Widget's reading frequency should be set to PUSH. This means
58// that  you define how often to send data to Blynk App.
59void sendSensor()
60{
61  float  h = dht.readHumidity();
62  float t = dht.readTemperature(); // or dht.readTemperature(true)  for Fahrenheit
63
64  if (isnan(h) || isnan(t)) {
65    Serial.println("Failed  to read from DHT sensor!");
66    return;
67  }
68  // You can send any value  at any time.
69  // Please don't send more that 10 values per second.
70  Blynk.virtualWrite(V5,  h);  //V5 is for Humidity
71  Blynk.virtualWrite(V6, t);  //V6 is for Temperature
72}
73
74void  setup()
75{
76  Serial.begin(9600); // See the connection status in Serial Monitor
77  Blynk.begin(auth, ssid, pass);
78
79  dht.begin();
80
81  // Setup a function  to be called every second
82  timer.setInterval(1000L, sendSensor);
83}
84
85void  loop()
86{
87  Blynk.run(); // Initiates Blynk
88  timer.run(); // Initiates  SimpleTimer
89}
90