Tech Gyan Set
Published © MIT

ESP32-Based Smart Home Automation Using Firebase Realtime Da

ESP32 + Firebase smart home system with real-time sync between app, web, and manual switches—no ON/OFF mismatch.

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ESP32-Based Smart Home Automation Using Firebase Realtime Da

Things used in this project

Software apps and online services

Arduino IDE
Arduino IDE

Story

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Code

1️⃣ Required Software (Pehle Install Karo)

C/C++
🔹 Arduino IDE

👉 Board Manager me ESP32 by Espressif Systems install karo

🔹 Firebase Library

Arduino IDE → Library Manager → install:
Firebase ESP Client by Mobizt

2️⃣ Firebase Setup (Important)

C/C++
🔹 Firebase Realtime Database

Firebase Console → New Project

Realtime Database → Create

Rules (Testing ke liye):
home
└── room1
├── light1 : false
└── fan1 : false
{
  "rules": {
    ".read": true,
    ".write": true
  }
}


home
 └── room1
     ├── light1 : false
     └── fan1   : false

3️⃣ ESP32 Code (🔥 MAIN CODE)

C/C++
📌 Replace:

WiFi Name & Password

Firebase URL

Firebase Secret
#include <WiFi.h>
#include <Firebase_ESP_Client.h>

// 🔹 WiFi Credentials
#define WIFI_SSID "YOUR_WIFI_NAME"
#define WIFI_PASSWORD "YOUR_WIFI_PASSWORD"

// 🔹 Firebase Credentials
#define DATABASE_URL "https://your-project-id.firebaseio.com/"
#define DATABASE_SECRET "YOUR_DATABASE_SECRET"

// 🔹 Firebase Objects
FirebaseData fbdo;
FirebaseAuth auth;
FirebaseConfig config;

// 🔹 Relay Pins
#define RELAY_LIGHT 26
#define RELAY_FAN   27

// 🔹 Manual Switch Pins
#define SWITCH_LIGHT 32
#define SWITCH_FAN   33

bool lastLightState = HIGH;
bool lastFanState   = HIGH;

void setup() {
  Serial.begin(115200);

  pinMode(RELAY_LIGHT, OUTPUT);
  pinMode(RELAY_FAN, OUTPUT);

  pinMode(SWITCH_LIGHT, INPUT_PULLUP);
  pinMode(SWITCH_FAN, INPUT_PULLUP);

  digitalWrite(RELAY_LIGHT, HIGH);
  digitalWrite(RELAY_FAN, HIGH);

  // 🔹 WiFi Connect
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
  Serial.print("Connecting to WiFi");
  while (WiFi.status() != WL_CONNECTED) {
    Serial.print(".");
    delay(500);
  }
  Serial.println("\nWiFi Connected!");

  // 🔹 Firebase Config
  config.database_url = DATABASE_URL;
  config.signer.tokens.legacy_token = DATABASE_SECRET;

  Firebase.begin(&config, &auth);
  Firebase.reconnectWiFi(true);

  Serial.println("Firebase Connected!");
}

void loop() {

  // 🔹 Read Firebase Values
  if (Firebase.RTDB.getBool(&fbdo, "/home/room1/light1")) {
    bool lightState = fbdo.boolData();
    digitalWrite(RELAY_LIGHT, lightState ? LOW : HIGH);
  }

  if (Firebase.RTDB.getBool(&fbdo, "/home/room1/fan1")) {
    bool fanState = fbdo.boolData();
    digitalWrite(RELAY_FAN, fanState ? LOW : HIGH);
  }

  // 🔹 Manual Switch Light
  bool currentLightSwitch = digitalRead(SWITCH_LIGHT);
  if (currentLightSwitch != lastLightState) {
    lastLightState = currentLightSwitch;
    bool newState = currentLightSwitch == LOW;
    Firebase.RTDB.setBool(&fbdo, "/home/room1/light1", newState);
    delay(300);
  }

  // 🔹 Manual Switch Fan
  bool currentFanSwitch = digitalRead(SWITCH_FAN);
  if (currentFanSwitch != lastFanState) {
    lastFanState = currentFanSwitch;
    bool newState = currentFanSwitch == LOW;
    Firebase.RTDB.setBool(&fbdo, "/home/room1/fan1", newState);
    delay(300);
  }
}

Credits

Tech Gyan Set
6 projects • 1 follower
Thanks to Tech Gyan Set .

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Related channels and tags
  • Home Automation
  • Home Automation
  • Internet of Things
  • Internet of Things