![\"ESP32](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2021\/11\/ESP32-ESP8266-Firebase-RTDB-Sensor-Readings-Authentication.jpg?resize=1200%2C675&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\nUpdated 30 April 2025<\/em><\/p>\n\n\n\n Here’s Part 2 of this project: ESP32\/ESP8266: Firebase Web App to Display Sensor Readings (with Authentication)<\/a><\/p>\n\n\n\n Other Firebase Tutorials with the ESP32\/ESP8266 that you might be interested in:<\/p>\n\n\n\n Firebase is Google’s mobile application development platform that helps you build, improve, and grow your app. It has many services used to manage data from any android, IOS, or web application like authentication<\/a>, realtime database<\/a>, hosting<\/a>, etc.<\/p>\n\n\n\n The following diagram shows a high-level overview of the project we’ll build.<\/p>\n\n\n These are the main steps to complete this project:<\/p>\n\n\n\n You can continue with the Firebase project from this previous<\/a> tutorial<\/strong> or create a new project. If you use the Firebase project of that previous tutorial, you can skip to section 4) Set up Realtime Database<\/a> because the authentication methods are already set up.<\/p>\n\n\n\n For this tutorial, we’ll program the ESP32 and ESP8266 boards using the Arduino core. So, make sure you have the ESP32 or ESP8266 add-on installed in your Arduino IDE:<\/p>\n\n\n\n If you want to program the ESP boards using VS Code with the PlatformIO extension, follow the following tutorial instead:<\/p>\n\n\n\n Follow the next instructions to create a new project on Firebase.<\/p>\n\n\n\n To allow authentication with email and password, first, you need to set authentication methods for your app. <\/p>\n\n\n\n “Most apps need to know the identity of a user. In other words, it takes care of logging in and identifying the users (in this case, the ESP32 or ESP8266). Knowing a user’s identity allows an app to securely save user data in the cloud and provide the same personalized experience across all of the user’s devices.” To learn more about the authentication methods, you can read the documentation<\/a>.<\/p>\n\n\n\n You need to set authentication methods for your app. <\/p>\n\n\n\n “Most apps need to know the identity of a user. In other words, it takes care of logging in and identifying the users (in this case, the ESP32). Knowing a user’s identity allows an app to securely save user data in the cloud …” To learn more about the authentication methods, you can read the documentation<\/a>.<\/p>\n\n\n\n To interface with your Firebase project using the ESP32 or ESP8266 boards, you need to get your project API key. Follow the next steps to get your project API key.<\/p>\n\n\n\n Now, let’s create a realtime database and set up database rules for our project.<\/p>\n\n\n\n 1)<\/strong> On the left sidebar, click on Realtime Database<\/strong> and then click on Create Database<\/strong>.<\/p>\n\n\n 2)<\/strong> Select your database location. It should be the closest to your location.<\/p>\n\n\n 3)<\/strong> Set up security rules for your database. You can select Start in test mode<\/strong>. We’ll change the database rules in just a moment.<\/p>\n\n\n 4)<\/strong> Your database is now created. You need to copy and save the database URL\u2014highlighted in the following image\u2014because you’ll need it later in your ESP32\/ESP8266 code.<\/p>\n\n\n Now, let’s set up the database rules. On the Realtime Database<\/strong> tab, select the Rules<\/strong> tab at the top. Then, click on Edit rules<\/strong>, copy the following rules and then click Publish<\/strong>.<\/p>\n\n\n\n These rules allow access only to the node that matches the authenticated user’s UID. This ensures that each user can access only their own data. In other words, a user can only read or write to the parts of the database located under their specific UID. Any data stored outside of their UID node will not be accessible to them.<\/p>\n\n\n\n For example, imagine our user UID is RjO3taAzMMXBB2Xmir2LQ<\/span>. With our security rules, it can read and write data to the database under the node UsersData\/RjO3taAzMMXBB2Xmir2LQ<\/span>.<\/p>\n\n\n\n You’ll better understand how this works when you start working with the ESP32\/ESP8266.<\/p>\n\n\n\n In this section, we’ll program the ESP32 or ESP8266 boards to do the following tasks:<\/p>\n\n\n\n For this project, you need the following parts*:<\/p>\n\n\n\n * you can also test the project with random values instead of sensor readings, or you can use any other sensor you’re familiar with.<\/p>\n\n\n You can use the preceding links or go directly to MakerAdvisor.com\/tools<\/a> to find all the parts for your projects at the best price!<\/p> In this tutorial, we’ll send BME280 sensor readings to the Firebase Realtime Database. So, you need to wire the BME280 sensor to your board. Follow one of the following schematic diagrams.<\/p>\n\n\n\n We’re going to use I2C communication<\/a> with the BME280 sensor module. For that, wire the sensor to the default ESP32 SCL (GPIO 22<\/span>) and SDA (GPIO 21<\/span>) pins, as shown in the following schematic diagram.<\/p>\n\n\n Not familiar with the BME280 with the ESP32? Read this tutorial: ESP32 with BME280 Sensor using Arduino IDE (Pressure, Temperature, Humidity)<\/strong><\/a>.<\/p>\n\n\n\n We’re going to use I2C communication with the BME280 sensor module. For that, wire the sensor to the ESP8266 SDA (GPIO 4<\/span>) and SCL (GPIO 5<\/span>) pins, as shown in the following schematic diagram.<\/p>\n\n\n Not familiar with the BME280 with the ESP8266? Read this tutorial: ESP8266 with BME280 using Arduino IDE (Pressure, Temperature, Humidity)<\/strong><\/a>.<\/p>\n\n\n\n For this project, you need to install the following libraries:<\/p>\n\n\n\n Follow the next instructions if you’re using VS Code with the PlatformIO or pioarduino extension.<\/p>\n\n\n\n Click on the PIO Home<\/strong> icon and select the Libraries tab<\/strong>. Search for “FirebaseClient<\/strong>“. Select the Firebase Client Library<\/strong> by Mobitz.<\/p>\n\n\n\n If you’re using VS Code with the PlatformIO extension, click on the PIO Home<\/strong> icon and then select the Libraries tab<\/strong>. Search for “FirebaseClient<\/strong>“. Select the Firebase Client Library<\/strong> by Mobitz.<\/p>\n\n\n Then, click Add to Project<\/strong> and select the project you’re working on.<\/p>\n\n\n Then, click Add to Project<\/strong> and select the project you’re working on.<\/p>\n\n\n\n Install the BME280 Library<\/strong> <\/p>\n\n\n\n In the Libraries<\/strong> tab, search for BME280<\/strong>. Select the Adafruit BME280<\/strong> library.<\/p>\n\n\n Then, click Add to Project<\/strong> and select the project you’re working on.<\/p>\n\n\n Also, change the monitor speed to 115200 by adding the following line to the platformio.ini<\/span> file of your project:<\/p>\n\n\n\n Follow this section if you’re using Arduino IDE. <\/p>\n\n\n\n You need to install the following libraries:<\/p>\n\n\n\n Go to Sketch <\/strong>> Include Library<\/strong> > Manage Libraries<\/strong>, search for the libraries’ names, and install the libraries.<\/p>\n\n\n Now, you’re all set to start programming the ESP32 and ESP8266 boards to interact with the database.<\/p>\n\n\n\n Copy the following code to your Arduino IDE or to the main.cpp<\/span> file if you’re using VS Code.<\/p>\n\n\n\n You need to insert your network credentials, project API key, database URL, and the authorized user email and password.<\/p>\n\n\n View raw code<\/a><\/p>\n\n\n\n Continue reading to learn how the code works, or skip to the demonstration section<\/a>.<\/p>\n\n\n\n First, include the required libraries. We’re including different WiFi libraries for the ESP32 and ESP8266.<\/p>\n\n\n\n Include your network credentials in the following lines so that your boards can connect to the internet using your local network.<\/p>\n\n\n\n Insert your Firebase project API key<\/a>\u2014the one you’ve gotten in this section<\/a>.<\/p>\n\n\n\n Insert your database URL<\/a> in the following line:<\/p>\n\n\n\n Insert the authorized email and the corresponding password<\/a>\u2014these are the details of the user you’ve added in this section<\/a>.<\/p>\n\n\n\n The following line creates an authentication object using the project API key, the project user email, and password.<\/p>\n\n\n\n\n
What is Firebase?<\/h2>\n\n\n
![\"Firebase](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2021\/09\/Firebase-Logo.png?resize=750%2C196&quality=100&strip=all&ssl=1\"){kind=logo}
<\/figure><\/div>\n\n\nProject Overview<\/h2>\n\n\n\n
![\"Firebase](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2021\/11\/Firebase-BME280-Sensor-Readings-Database-Project-Overview-f.png?resize=746%2C378&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n\n
\n
Preparing Arduino IDE<\/h2>\n\n\n\n
\n
\n
1) Create Firebase Project<\/span><\/h2>\n\n\n\n
\n
![\"Set](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2025\/04\/1-create-firebase-project.png?w=1200&quality=100&strip=all&ssl=1\")
<\/figure><\/li>\n\n\n\n![\"Set](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2025\/04\/2-create-firebase-project-ai-assistance.png?w=1200&quality=100&strip=all&ssl=1\")
<\/figure><\/li>\n\n\n\n![\"Disable](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2025\/04\/3-create-firebase-project.png?w=1200&quality=100&strip=all&ssl=1\")
<\/figure><\/li>\n\n\n\n![\"Firebase](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2025\/04\/5-Firebase-project-ready.png?w=1200&quality=100&strip=all&ssl=1\")
<\/figure>
<\/li>\n\n\n\n![\"Firebase](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2025\/04\/6-Firebase-console-ESP-project.png?w=1200&quality=100&strip=all&ssl=1\")
<\/figure><\/li>\n<\/ol>\n\n\n\n2) Set Authentication Methods<\/h2>\n\n\n\n
\n
![\"Firebase](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2025\/04\/7-set-authentication.png?w=1200&quality=100&strip=all&ssl=1\")
<\/figure><\/li>\n\n\n\n![\"SFirebase](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2025\/04\/8-Firebase-authentication-methods.png?w=1200&quality=100&strip=all&ssl=1\")
<\/figure><\/li>\n\n\n\n![\"Enable](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2025\/04\/9-enable-email-password-firebase.png?w=1200&quality=100&strip=all&ssl=1\")
<\/figure><\/li>\n\n\n\n![\"Firebase](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2025\/04\/10-add-user-email-password-firebase.png?w=1200&quality=100&strip=all&ssl=1\")
<\/figure><\/li>\n\n\n\n![\"Firebase](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2025\/04\/11-add-user-email-pass.png?w=1200&quality=100&strip=all&ssl=1\")
<\/figure><\/li>\n\n\n\n![\"Firebase](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2025\/04\/12-user-created-firebase.png?w=1200&quality=100&strip=all&ssl=1\")
<\/figure><\/li>\n<\/ol>\n\n\n\n3) Get Project API Key<\/h2>\n\n\n\n
\n
![\"Firebase](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2025\/04\/17-project-settings-firebase.png?w=1200&quality=100&strip=all&ssl=1\")
<\/figure><\/li>\n\n\n\n![\"Firebase](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2025\/04\/18-project-api-key-firebase.png?w=1200&quality=100&strip=all&ssl=1\")
<\/figure><\/li>\n<\/ol>\n\n\n\n4) Set up Realtime Database<\/h2>\n\n\n\n
![\"Firebase](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2025\/04\/13-create-database-firebase.png?resize=750%2C452&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n![\"Firebase](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2025\/04\/14-database-location-firebase.png?resize=743%2C369&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n![\"Firebase](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2025\/04\/15-database-start-test-mode-firebase.png?resize=750%2C494&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n![\"Firebase](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2025\/04\/16-firebase-database-url.png?resize=750%2C490&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n5) Set up Database Security Rules<\/h2>\n\n\n\n
\/\/ These rules grant access to a node matching the authenticated\n\/\/ user's ID from the Firebase auth token\n{\n \"rules\": {\n \"UsersData\": {\n \"$uid\": {\n \".read\": \"$uid === auth.uid\",\n \".write\": \"$uid === auth.uid\"\n }\n }\n }\n}<\/code><\/pre>\n\n\n![\"Firebase](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2021\/11\/Firebase-Realtime-Database-Rules.jpg?resize=782%2C492&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n6) ESP32\/ESP8266 Send Sensor Readings to the Realtime Database<\/span><\/h2>\n\n\n\n
\n
Parts Required<\/h3>\n\n\n\n
\n
![](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2017\/10\/header-200.png?w=1200&quality=100&strip=all&ssl=1\")
<\/a><\/p>\n\n\n\nSchematic Diagram<\/h3>\n\n\n\n
ESP32 with BME280<\/h4>\n\n\n\n
![\"ESP32](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2020\/10\/ESP32-BME280-Sensor-Temperature-Humidity-Pressure-Wiring-Diagram-Circuit_f.png?resize=675%2C670&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\nESP8266 with BME280 <\/h4>\n\n\n\n
![\"ESP8266](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2020\/07\/ESP8266-NodeMCU-BME280-Sensor-Temperature-Humidity-Pressure-Wiring-Diagram-Circuit.png?resize=675%2C531&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\nInstalling Libraries<\/h3>\n\n\n\n
\n
Installing Libraries – VS Code<\/h4>\n\n\n\n
Install the FirebaseClient Library<\/strong><\/h5>\n\n\n\n
![\"Install](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2021\/09\/Install-FirebsaeClient-Library-VS-Code.jpg?resize=750%2C646&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n![\"Add](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2021\/09\/Add-FirebaseClient-library-to-project-VS-Code.jpg?resize=750%2C341&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n![\"PlatformIO](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2020\/09\/PlatformIO-VS-Code-Search-BME280-library.png?resize=996%2C661&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n![\"PlatformIO](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2020\/09\/PlatformIO-add-library-to-project.png?resize=745%2C243&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\nmonitor_speed = 115200<\/code><\/pre>\n\n\n\nInstallation – Arduino IDE<\/h4>\n\n\n\n
\n
![\"Install](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2021\/09\/install-Firebase-client-arduino-ide.png?resize=790%2C586&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\nSend Sensor Readings to the Realtime Database<\/span> Code<\/h3>\n\n\n\n
\/*\r\n Rui Santos & Sara Santos - Random Nerd Tutorials\r\n Complete project details at our blog: https:\/\/RandomNerdTutorials.com\/esp32-esp8266-firebase-bme280-rtdb\/\r\n Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files.\r\n The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.\r\n*\/\r\n\r\n#include <Arduino.h>\r\n#if defined(ESP32)\r\n #include <WiFi.h>\r\n#elif defined(ESP8266)\r\n #include <ESP8266WiFi.h>\r\n#endif\r\n#include <WiFiClientSecure.h>\r\n#include <FirebaseClient.h>\r\n#include <Adafruit_Sensor.h>\r\n#include <Adafruit_BME280.h>\r\n\r\n\/\/ Network and Firebase credentials\r\n#define WIFI_SSID "REPLACE_WITH_YOUR_SSID"\r\n#define WIFI_PASSWORD "REPLACE_WITH_YOUR_PASSWORD"\r\n\r\n#define Web_API_KEY "REPLACE_WITH_YOUR_PROJECT_API_KEY"\r\n#define DATABASE_URL "REPLACE_WITH_YOUR_DATABASE_URL"\r\n#define USER_EMAIL "REPLACE_WITH_THE_USER_EMAIL"\r\n#define USER_PASSWORD "REPLACE_WITH_THE_USER_PASSWORD"\r\n\r\n\/\/ User function\r\nvoid processData(AsyncResult &aResult);\r\n\r\n\/\/ Authentication\r\nUserAuth user_auth(Web_API_KEY, USER_EMAIL, USER_PASS);\r\n\r\n\/\/ Firebase components\r\nFirebaseApp app;\r\nWiFiClientSecure ssl_client;\r\nusing AsyncClient = AsyncClientClass;\r\nAsyncClient aClient(ssl_client);\r\nRealtimeDatabase Database;\r\n\r\n\/\/ Timer variables for sending data every 10 seconds\r\nunsigned long lastSendTime = 0;\r\nconst unsigned long sendInterval = 10000;\r\n\r\n\/\/ Variable to save USER UID\r\nString uid;\r\n\r\n\/\/ Variables to save database paths\r\nString databasePath;\r\nString tempPath;\r\nString humPath;\r\nString presPath;\r\n\r\n\/\/ BME280 sensor\r\nAdafruit_BME280 bme; \/\/ I2C\r\nfloat temperature;\r\nfloat humidity;\r\nfloat pressure;\r\n\r\n\/\/ Initialize BME280\r\nvoid initBME(){\r\n if (!bme.begin(0x76)) {\r\n Serial.println("Could not find a valid BME280 sensor, check wiring!");\r\n while (1);\r\n }\r\n Serial.println("BME280 Initialized with success");\r\n}\r\n\r\nvoid setup(){\r\n Serial.begin(115200);\r\n\r\n initBME();\r\n\r\n \/\/ Connect to Wi-Fi\r\n WiFi.begin(WIFI_SSID, WIFI_PASSWORD);\r\n Serial.print("Connecting to Wi-Fi");\r\n while (WiFi.status() != WL_CONNECTED) {\r\n Serial.print(".");\r\n delay(300);\r\n }\r\n Serial.println();\r\n\r\n ssl_client.setInsecure();\r\n #if defined(ESP32)\r\n ssl_client.setConnectionTimeout(1000);\r\n ssl_client.setHandshakeTimeout(5);\r\n #elif defined(ESP8266)\r\n ssl_client.setTimeout(1000); \/\/ Set connection timeout\r\n ssl_client.setBufferSizes(4096, 1024); \/\/ Set buffer sizes\r\n #endif\r\n\r\n \/\/ Initialize Firebase\r\n initializeApp(aClient, app, getAuth(user_auth), processData, "\ud83d\udd10 authTask");\r\n app.getApp<RealtimeDatabase>(Database);\r\n Database.url(DATABASE_URL);\r\n}\r\n\r\nvoid loop(){\r\n \/\/ Maintain authentication and async tasks\r\n app.loop();\r\n\r\n \/\/ Check if authentication is ready\r\n if (app.ready()){\r\n\r\n \/\/ Periodic data sending every 10 seconds\r\n unsigned long currentTime = millis();\r\n if (currentTime - lastSendTime >= sendInterval){\r\n \/\/ Update the last send time\r\n lastSendTime = currentTime;\r\n \r\n \/\/ Get User UID\r\n Firebase.printf("User UID: %s\\n", app.getUid().c_str());\r\n uid = app.getUid().c_str();\r\n databasePath = "UsersData\/" + uid;\r\n\r\n \/\/ Update database path for sensor readings\r\n tempPath = databasePath + "\/temperature"; \/\/ --> UsersData\/<user_uid>\/temperature\r\n humPath = databasePath + "\/humidity"; \/\/ --> UsersData\/<user_uid>\/humidity\r\n presPath = databasePath + "\/pressure"; \/\/ --> UsersData\/<user_uid>\/pressure\r\n\r\n \/\/ Get latest sensor readings\r\n temperature = bme.readTemperature();\r\n humidity = bme.readHumidity();\r\n pressure = bme.readPressure()\/100.0F;\r\n \r\n Serial.println("Writing to: " + tempPath);\r\n\r\n Database.set<float>(aClient, tempPath, temperature, processData, "RTDB_Send_Temperature");\r\n Database.set<float>(aClient, humPath, humidity, processData, "RTDB_Send_Humidity");\r\n Database.set<float>(aClient, presPath, pressure, processData, "RTDB_Send_Pressure");\r\n\r\n }\r\n }\r\n}\r\n\r\nvoid processData(AsyncResult &aResult){\r\n if (!aResult.isResult())\r\n return;\r\n\r\n if (aResult.isEvent())\r\n Firebase.printf("Event task: %s, msg: %s, code: %d\\n", aResult.uid().c_str(), aResult.eventLog().message().c_str(), aResult.eventLog().code());\r\n\r\n if (aResult.isDebug())\r\n Firebase.printf("Debug task: %s, msg: %s\\n", aResult.uid().c_str(), aResult.debug().c_str());\r\n\r\n if (aResult.isError())\r\n Firebase.printf("Error task: %s, msg: %s, code: %d\\n", aResult.uid().c_str(), aResult.error().message().c_str(), aResult.error().code());\r\n\r\n if (aResult.available())\r\n Firebase.printf("task: %s, payload: %s\\n", aResult.uid().c_str(), aResult.c_str());\r\n}\r\n<\/code><\/pre>\n\tHow the Code Works<\/h3>\n\n\n\n
Include Libraries<\/h4>\n\n\n\n
#include <Arduino.h>\n#if defined(ESP32)\n #include <WiFi.h>\n#elif defined(ESP8266)\n #include <ESP8266WiFi.h>\n#endif\n#include <WiFiClientSecure.h>\n#include <FirebaseClient.h>\n#include <Adafruit_Sensor.h>\n#include <Adafruit_BME280.h><\/code><\/pre>\n\n\n\nNetwork Credentials<\/h4>\n\n\n\n
\/\/ Insert your network credentials\n#define WIFI_SSID \"REPLACE_WITH_YOUR_SSID\"\n#define WIFI_PASSWORD \"REPLACE_WITH_YOUR_PASSWORD\"<\/code><\/pre>\n\n\n\nFirebase Project API Key, Firebase User, and Database URL<\/h4>\n\n\n\n
#define Web_API_KEY \"REPLACE_WITH_YOUR_PROJECT_API_KEY\"<\/code><\/pre>\n\n\n\n\/\/ Insert RTDB URLefine the RTDB URL\n#define DATABASE_URL \"REPLACE_WITH_YOUR_DATABASE_URL\"<\/code><\/pre>\n\n\n\n#define USER_EMAIL \"REPLACE_WITH_THE_USER_EMAIL\"\n#define USER_PASSWORD \"REPLACE_WITH_THE_USER_PASSWORD\"<\/code><\/pre>\n\n\n\nDeclaring Firebase Authentication and Components<\/h4>\n\n\n\n