IoT Project: Google Firebase using NodeMCU ESP8266

In this IoT (Internet of Things) project, we will connect Arduino NodeMCU device with Google Firebase database and by using Android application, we shall send data to Firebase to control LED.

Google Firebase database is a real-time, high speed and free database provided by Google.

Hardware Requirements

Wi-Fi Node MCU ESP8266
Standard USB cable to connect Node MCU
Jumper wires female to female
LED
Bulb holder
Wire
AC 220v/120v home appliances or 9v Hi-Walt Battery

Software requirements

Arduino software
Android Studio

Working principle of the project (Android app, Google Firebase, and Node MCU)

In this project, there are three main components which use an Android app, Firebase database, and Wi-Fi Node MCU.

The Android app sends the serial data 1 or 0 to the Firebase database. The Firebase database interacts with Wi-Fi NodeMCU and this NodeMCU acts on the basis of data received from Firebase Database. If NodeMCU receives serial data 1, it turns ON the LED, and if NodeMCU receives serial input 0 then it turns OFF the LED.

This project is classified into three different steps:

Connecting Arduino Node-MCU with Google Firebase
Control Led Using Firebase Console
Control Led with Android App using Firebase database

Connecting Arduino Node-MCU with Google Firebase

Download the Firebase Arduino library from https://github.com/FirebaseExtended/firebase-arduino

Add the Firebase Arduino library to Arduino IDE, click Sketch -> Include Library -> Add .ZIP Library…. and select downloaded library.

If Firebase Arduino library is successfully added, it shows in Include Library.

Now, Login the Google Firebase using your Google account. Create a Firebase project by clicking Add project.

Provide a project name and create project.

Click, Project Overview setting where you will find your project’s detail. Now, click on Service accounts option to view database secrets.

A program on Arduino IDE to connect NodeMCU and Google Firebase

Click, File > Examples > FirebaseArduino > FirebaseDemo_ESP8266

Click on Project Overview > Project Settings > Service Account > Database secrets to view firebase auth secrets, add this secret to your Arduino program’s FIREBASE_AUTH.

Go to database section at left-menu and search for Realtime Database, where you find the Firebase host URL. Copy this URL without “https://” and “/” the at end and paste it at FIREBASE_HOST in the program.

Add Realtime database in your project, click Project Overview setting > Realtime Database.

Add your WIFI name and password in WIFI_SSID and WIFI_PASSWORD respectively.

 #include <Firebase.h> #include <FirebaseArduino.h> #include <FirebaseCloudMessaging.h> #include <FirebaseError.h> #include <FirebaseHttpClient.h> #include <FirebaseObject.h>  // // Copyright 2015 Google Inc. // // Licensed under the Apache License, Version 2.0 (the “License”); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // //     http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an “AS IS” BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. //  // FirebaseDemo_ESP8266 is a sample that demo the different functions // of the FirebaseArduino API.  #include <ESP8266WiFi.h> #include <FirebaseArduino.h>  // Set these to run example. #define FIREBASE_HOST “nodemcu-demo-697d8.firebaseio.com” #define FIREBASE_AUTH “YOUR_FIREBASE_AUTH” #define WIFI_SSID “NETGEAR64” #define WIFI_PASSWORD “*tutoraspire#”  void setup() {   Serial.begin(9600);    // connect to wifi.   WiFi.begin(WIFI_SSID, WIFI_PASSWORD);   Serial.print(“connecting”);   while (WiFi.status() != WL_CONNECTED) {     Serial.print(“.”);     delay(500);   }   Serial.println();   Serial.print(“connected: “);   Serial.println(WiFi.localIP());      Firebase.begin(FIREBASE_HOST, FIREBASE_AUTH); }  int n = 0;  void loop() {   // set value   Firebase.setFloat(“number”, 42.0);   // handle error   if (Firebase.failed()) {       Serial.print(“setting /number failed:”);       Serial.println(Firebase.error());         return;   }   delay(1000);      // update value   Firebase.setFloat(“number”, 43.0);   // handle error   if (Firebase.failed()) {       Serial.print(“setting /number failed:”);       Serial.println(Firebase.error());         return;   }   delay(1000);    // get value    Serial.print(“number: “);   Serial.println(Firebase.getFloat(“number”));   delay(1000);    // remove value   Firebase.remove(“number”);   delay(1000);    // set string value   Firebase.setString(“message”, “hello world”);   // handle error   if (Firebase.failed()) {       Serial.print(“setting /message failed:”);       Serial.println(Firebase.error());         return;   }   delay(1000);      // set bool value   Firebase.setBool(“truth”, false);   // handle error   if (Firebase.failed()) {       Serial.print(“setting /truth failed:”);       Serial.println(Firebase.error());         return;   }   delay(1000);    // append a new value to /logs   String name = Firebase.pushInt(“logs”, n++);   // handle error   if (Firebase.failed()) {       Serial.print(“pushing /logs failed:”);       Serial.println(Firebase.error());         return;   }   Serial.print(“pushed: /logs/”);   Serial.println(name);   delay(1000); } 

Connect your NodeMCU ESP8266 with your personal computer via standard USB cable and upload code in it. While uploading the code into NodeMCU, the device continuously blinks.

Now open the serial monitor form Tools, you will find data are uploaded to Firebase database.

Note: If you got setting /number failed: message in serial monitor then updates the fingerprint: go to C:/Users/{username}/My Documents/Arduino/libraries/firebase-arduino-master/src open FirebaseHttpClient.h file, and update the fingerprint with => 6F D0 9A 52 C0 E9 E4 CD A0 D3 02 A4 B7 A1 92 38 2D CA 2F 26

Output:

Google Firebase database is one of the fastest, real-time and free databases for IoT.

Next TopicIoT Google Firebase Controlling LED with NodeMCU

IoT Google Firebase NodeMCU

IoT Project: Google Firebase using NodeMCU ESP8266

Hardware Requirements

Software requirements

Working principle of the project (Android app, Google Firebase, and Node MCU)

Connecting Arduino Node-MCU with Google Firebase

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