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

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

Hardware Requirements

Wi-Fi Node MCU ESP8266
Standard USB cable to attach 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 idea of knowledge received from Firebase Database. If NodeMCU receives serial data 1, it activates the LED, and if NodeMCU receives serial input 0 then it turns OFF the LED.

This project is assessed 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 choose 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 make project.

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

A program on Arduino IDE to attach NodeMCU and Google Firebase

Click, File > Examples > FirebaseArduino > FirebaseDemo_ESP8266

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

Go to database section at left-menu and look for Realtime Database, where you discover the Firebase host URL. Copy this URL without “https://” and “/” the at end and paste it at FIREBASE_HOST within 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
#include
#include
#include
#include
#include
//
//
// Licensed under the Apache License, Version 2.0 (the “License”);
// you’ll not use this file except in compliance with the License.
// you’ll obtain a replica 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 precise language governing permissions and
// limitations under the License.
//
// FirebaseDemo_ESP8266 may be a sample that demo the various functions
// of the FirebaseArduino API.
#include
#include
// 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 “*TECKLEARN#”
void setup() {
Serial.begin(9600);
// hook up with 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 replacement 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 together with your pc 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’ll find data are uploaded to Firebase database.

Note: If you bought setting /number failed: message in serial monitor then updates the fingerprint: attend 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 among the fastest, real-time and free databases for IoT.

So, this brings us to the end of blog. This Tecklearn ‘IoT project – Google Firebase using NodeMCU ESP8266’ blog helps you with commonly asked questions if you are looking out for a job in Internet of Things (IoT). If you wish to learn IoT and build a career in Internet of Things (IoT) domain, then check out our interactive, Internet of Things (IoT) Training, that comes with 24*7 support to guide you throughout your learning period. Please find the link for course details:

https://www.tecklearn.com/course/iot-internet-of-things-training/

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Gartner Says 5.8 Billion Enterprise and Automotive IoT Endpoints Will Be in Use in 2020

What you will Learn in this Course?

Introduction to Internet of Things

What is IoT, how does it work
IoT vs IIoT
Business Cases of IIoT
Industry 4.0
Properties of IoT device
IoT Ecosystem
IoT Decision Framework
IoT Solution Architecture Models
How IoT is Transforming Businesses
Major IoT Boards in Market

IoT Communication Protocols

Types of wireless communication
Major wireless Short-range communication devices and properties
Comparison of these devices (Bluetooth, WIFI, ZigBee, 6LoWPAN)
Major wireless Long-range communication devices and properties, Comparison of these devices (Cellular IoT, LPWAN)

IoT Architecture

The IoT Stack Architecture and the various components and layers
The app, the data processing and platform
IoT OS like Contiki, FreeRTOS and mbe
The edge and the connected thing or device

IoT Sensors and Device Platforms

Introduction to IoT Sensors and the role they play in getting the IoT systems work efficiently
Micro-electromechanical systems revolutionizing IoT sensors
Use Case of Water Quality Monitoring
Use Case: Sericulture
Difference between microcontroller and microprocessor
IoT Device Platforms – Arduino, Raspberry Pi etc
Smartphone Centric Architecture
IoT Application Layer protocols
Hands On

Arduino Platform and Arduino Interfacing

Arduino physical board, libraries and the Integrated Development Environment
Arduino Shields various operations such as heat and light sensing, GPS, UI display
Programming Arduino using C language
Controlling external devices using pins on the Arduino board
The Arduino Interface
Reading inputs from various sources and providing an output
Working with sensors for sensing and controlling the physical world
Deploying various types of sensors and connecting it to the Arduino
Constant conversion between analog and digital signals for information exchange between the physical and digital domains
Hands On

Raspberry Pi Platform and Raspberry Pi Interfacing

Introduction to Raspberry Pi
Set up of Raspberry Pi environment
Coding for the Raspberry Pi using Python
Deploying Python-based Integrated Development Environment
Interfacing the Raspberry Pi with the physical world
Introducing the various input and output devices
Raspberry Pi expansion boards for building complex hardware setup
Real-time demo of Raspberry Pi interfacing
Hands On

Arduino Uno Wifi and IoTivity

Iotivity
Iotivity Architecture
Hands On

Netduino Platform and Netduino Interfacing

Introduction to Netduino Platform
Setting up the Netduino environment
Coding for the Netduino
Interfacing the Netduino with the physical world
Introducing the various input and output devices
Real-time demo of Netduino interfacing
Hands On

IoT for Arduino, NodeMCU and Netduino

Control LED light using Netduino board
NodeMCU
Blynk

Project: Building WSN with MQTT, Raspberry Pi & Arduino

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