🚨 Intrusion Detection System

Real-Time PIR Motion Detection • ESP8266 NodeMCU • Firebase • Flutter App

This repository contains a full Intrusion Detection System built using a PIR sensor, ESP8266 NodeMCU, Firebase backend, and a Flutter mobile app for real-time alerts.

The system detects motion near a door or restricted zone and instantly updates Firebase while triggering push notifications to your phone.

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📌 Features

🔹 Hardware (ESP8266 + PIR)

• Detects motion using a PIR sensor (HC-SR501)
• Sends real-time motion alerts to Firebase
• Device heartbeat every 10 seconds
• Wi-Fi auto-reconnect + online/offline status tracking
• Secure credential separation using secret.h

🔹 Software (Flutter Mobile App)

• Firebase Realtime DB listener
• Displays motion alerts & logs
• Shows device online/offline status
• Clean UI for monitoring entry events

🔹 Firebase Backend

• Realtime Database (logs + live status)
• Firebase Authentication (email/password)
• Cloud Messaging (FCM) push alerts
• Secure rule structure

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📂 Project Structure

pir_motion_app/ │ ├── Arduino/ │ ├── Door_Alert/ │ │ ├── Door_Alert.ino # Main intrusion detection firmware │ │ ├── secret.h # Wi-Fi + Firebase credentials (ignored) │ │ └── secret_example.h # (Optional) placeholder file for repo │ ├── lib/ # Flutter app source ├── android/ # Flutter Android config ├── ios/ # Flutter iOS config ├── firebase/ # Firebase setup files (no secrets) ├── build/ # Flutter build artifacts ├── README.md # This documentation ├── LICENSE # MIT License └── .gitignore

🛠 Hardware Requirements

• ESP8266 NodeMCU (LOLIN / Wemos)
• PIR Motion Sensor (HC-SR501)
• USB Cable (for power + firmware upload)
• Jumper wires
• Optional: LED/Buzzer for physical alerts

🔌 Wiring Diagram

PIR Pin	NodeMCU Pin
VCC	5V or 3.3V
GND	GND
OUT	D5 (GPIO14)