ESP8266 IoT Platform using Firebase

1//FirebaseESP8266.h must be included before ESP8266WiFi.h
2#include  "FirebaseESP8266.h"  // Install Firebase ESP8266 library
3#include <ESP8266WiFi.h>
4#include  <DHT.h> //install DHT Library and Adafruit Unified Sensor Library
5
6
7#define  FIREBASE_HOST "Can be found at Database>Realtime Database at the top" //Without  http:// or https:// schemes
8#define FIREBASE_AUTH "Can be found in Settings>Service  Accounts>Database Secrets"
9#define WIFI_SSID "***"
10#define WIFI_PASSWORD  "***"
11
12#define DHTPIN 4   // Connect Data pin of DHT to D2
13int led =  14;     // Connect LED to D5
14
15#define DHTTYPE DHT22
16DHT dht(DHTPIN, DHTTYPE);
17
18//Define  FirebaseESP8266 data object
19FirebaseData firebaseData;
20FirebaseData ledData;
21
22FirebaseJson  json;
23
24
25void setup()
26{
27
28  Serial.begin(9600);
29
30  dht.begin();
31  pinMode(led,OUTPUT);
32  
33  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
34  Serial.print("Connecting  to Wi-Fi");
35  while (WiFi.status() != WL_CONNECTED)
36  {
37    Serial.print(".");
38    delay(300);
39  }
40  Serial.println();
41  Serial.print("Connected with  IP: ");
42  Serial.println(WiFi.localIP());
43  Serial.println();
44
45  Firebase.begin(FIREBASE_HOST,  FIREBASE_AUTH);
46  Firebase.reconnectWiFi(true);
47
48}
49
50void sensorUpdate(){
51  // Reading temperature or humidity takes about 250 milliseconds!
52  // Sensor  readings may also be up to 2 seconds 'old' (its a very slow sensor)
53  float h  = dht.readHumidity();
54  // Read temperature as Celsius (the default)
55  float  t = dht.readTemperature();
56  // Read temperature as Fahrenheit (isFahrenheit  = true)
57  float f = dht.readTemperature(true);
58
59  // Check if any reads  failed and exit early (to try again).
60  if (isnan(h) || isnan(t) || isnan(f))  {
61    Serial.println(F("Failed to read from DHT sensor!"));
62    return;
63  }
64
65  Serial.print(F("Humidity: "));
66  Serial.print(h);
67  Serial.print(F("%  Temperature: "));
68  Serial.print(t);
69  Serial.print(F("C  ,"));
70  Serial.print(f);
71  Serial.println(F("F  "));
72
73  if (Firebase.setFloat(firebaseData, "/FirebaseIOT/temperature",  t))
74  {
75    Serial.println("PASSED");
76    Serial.println("PATH: " +  firebaseData.dataPath());
77    Serial.println("TYPE: " + firebaseData.dataType());
78    Serial.println("ETag: " + firebaseData.ETag());
79    Serial.println("------------------------------------");
80    Serial.println();
81  }
82  else
83  {
84    Serial.println("FAILED");
85    Serial.println("REASON: " + firebaseData.errorReason());
86    Serial.println("------------------------------------");
87    Serial.println();
88  }
89
90  if (Firebase.setFloat(firebaseData, "/FirebaseIOT/humidity",  h))
91  {
92    Serial.println("PASSED");
93    Serial.println("PATH: " +  firebaseData.dataPath());
94    Serial.println("TYPE: " + firebaseData.dataType());
95    Serial.println("ETag: " + firebaseData.ETag());
96    Serial.println("------------------------------------");
97    Serial.println();
98  }
99  else
100  {
101    Serial.println("FAILED");
102    Serial.println("REASON: " + firebaseData.errorReason());
103    Serial.println("------------------------------------");
104    Serial.println();
105  }
106}
107void loop() {
108  sensorUpdate();
109
110  if (Firebase.getString(ledData, "/FirebaseIOT/led")){
111    Serial.println(ledData.stringData());
112    if (ledData.stringData() == "1") {
113    digitalWrite(led, HIGH);
114    }
115  else if (ledData.stringData() == "0"){
116    digitalWrite(led, LOW);
117    }
118  }
119  delay(100);
120}