IoT Smart Home System

A comprehensive IoT solution for smart home automation with mobile app control, voice integration, energy monitoring, and security system.

Features

📱 Device Control

• Control lights, thermostats, and other smart devices
• Real-time device status monitoring
• Brightness and temperature control
• Individual device management

🎤 Voice Integration

• Voice commands for device control
• Text-to-speech feedback
• Support for natural language commands
• Voice-activated device switching

⚡ Energy Monitoring

• Real-time power consumption tracking
• Energy usage statistics
• Cost calculation
• Hourly and daily consumption charts
• Peak power detection

🔒 Security System

• Door/window sensors
• Motion detection
• Alarm system with notifications
• Arming/disarming controls
• Security event logging

Technologies

• React Native - Mobile application framework
• Arduino - IoT device programming
• MQTT - Message queuing telemetry transport
• AWS IoT - Cloud IoT platform integration

Project Structure

IoT Smart Home System/
├── src/
│   ├── screens/           # React Native screens
│   │   ├── HomeScreen.js
│   │   ├── DevicesScreen.js
│   │   ├── EnergyScreen.js
│   │   ├── SecurityScreen.js
│   │   └── VoiceScreen.js
│   ├── services/          # Business logic services
│   │   ├── mqttService.js
│   │   ├── awsIoTService.js
│   │   ├── deviceService.js
│   │   ├── energyService.js
│   │   ├── securityService.js
│   │   └── voiceService.js
│   └── theme.js           # App theme configuration
├── arduino/               # Arduino device code
│   ├── smart_light/
│   ├── energy_monitor/
│   ├── security_sensor/
│   └── thermostat/
├── config/                # Configuration files
└── README.md

Installation

Prerequisites

• Node.js 14+ and npm
• React Native development environment
• Arduino IDE
• ESP8266 or ESP32 development board
• MQTT broker (local or cloud)

Mobile App Setup

1. Install dependencies:

   npm install

2. Configure connection:

   • Copy config/config.example.js to config/config.js
   • Update MQTT broker URL and AWS IoT credentials

3. Run the app:

   # For Expo
   npm start
   
   # For iOS
   npm run ios
   
   # For Android
   npm run android

Arduino Setup

1. Install Arduino IDE:

   • Download from https://www.arduino.cc/en/software

2. Install ESP8266/ESP32 Board Support:

   • File → Preferences → Additional Board Manager URLs
   • Add ESP8266/ESP32 board URLs (see arduino/libraries.md)

3. Install Required Libraries:

   • PubSubClient (MQTT)
   • ArduinoJson (JSON parsing)
   • DHT sensor library (for thermostat)

4. Configure and Upload:

   • Open the appropriate .ino file
   • Update WiFi credentials and MQTT broker settings
   • Select your board (ESP8266 or ESP32)
   • Upload to device

Configuration

MQTT Broker Setup

Local MQTT Broker (Mosquitto):

1. Install Mosquitto:

   # Windows (using Chocolatey)
   choco install mosquitto
   
   # macOS
   brew install mosquitto
   
   # Linux
   sudo apt-get install mosquitto mosquitto-clients

2. Start Mosquitto:

   # Default port 1883
   mosquitto -p 1883
   
   # With WebSocket support (port 8083)
   mosquitto -p 1883 -c /path/to/mosquitto.conf

3. Mosquitto Configuration (for WebSocket):

   listener 1883
   protocol mqtt
   
   listener 8083
   protocol websockets
   

Cloud MQTT Broker:

• Mosquitto Cloud: https://mosquitto.cloud/
• HiveMQ: https://www.hivemq.com/
• AWS IoT Core: Use AWS IoT configuration

AWS IoT Setup

1. Create AWS IoT Thing:

   • Go to AWS IoT Console
   • Create a new Thing
   • Download certificates

2. Configure Policy:

   • Create IoT policy with permissions:

     {
       "Effect": "Allow",
       "Action": ["iot:Connect", "iot:Publish", "iot:Subscribe", "iot:Receive"],
       "Resource": "*"
     }
     

3. Update Configuration:

   • Add endpoint to config/config.js
   • Configure credentials (Cognito/IAM roles recommended)

Usage

Device Control

1. Navigate to Devices tab
2. View all connected devices
3. Toggle devices on/off
4. Adjust brightness (for lights) or temperature (for thermostat)

Energy Monitoring

1. Navigate to Energy tab
2. View real-time power consumption
3. Check hourly and daily consumption charts
4. Monitor energy costs

Security System

1. Navigate to Security tab
2. Arm/disarm security system
3. View sensor status
4. Check recent security events

Voice Control

1. Navigate to Voice tab
2. Tap "Start Listening"
3. Speak commands:
   • "Turn on [device name]"
   • "Turn off [device name]"
   • "Brightness 50 [device name]"
   • "Temperature 22 [device name]"

MQTT Topics

Device Control:

• device/{deviceId}/control - Send commands to devices
• device/{deviceId}/status - Receive device status updates

Energy Monitoring:

• energy/monitoring - Energy consumption data

Security:

• security/alarm - Security alarms
• security/sensor - Sensor status updates
• security/control - Security system control
• security/motion - Motion detection events

Hardware Connections

Smart Light:

• LED connected to GPIO pin with PWM support
• Optional: LDR (Light Dependent Resistor) for ambient light sensing

Energy Monitor:

• ACS712 Current Sensor (5A, 20A, or 30A variant)
• Optional: Voltage divider for voltage measurement

Security Sensor:

• Magnetic Reed Switch (for door/window)
• OR PIR Motion Sensor (for motion detection)
• Optional: Buzzer for local alarm

Thermostat:

• DHT22 or DS18B20 temperature sensor
• Optional: Relay module for HVAC control

Troubleshooting

Mobile App Issues:

• Connection failed: Check MQTT broker URL and network connectivity
• Devices not updating: Verify MQTT subscriptions and message format
• Voice not working: Ensure microphone permissions are granted

Arduino Issues:

• WiFi not connecting: Verify SSID and password
• MQTT not connecting: Check broker IP address and port
• Sensor readings incorrect: Verify pin connections and sensor calibration

Development

Adding New Devices:

1. Create new Arduino sketch in arduino/ directory
2. Implement MQTT communication following existing patterns
3. Add device type to deviceService.js
4. Create UI components in appropriate screen

Customizing Features:

• Modify services in src/services/ for business logic changes
• Update screens in src/screens/ for UI changes
• Adjust configuration in config/config.js

License

This project is provided as-is for educational and development purposes.

Support

For issues and questions:

• Check Arduino libraries installation
• Verify MQTT broker connectivity
• Review configuration files
• Check device logs and serial output

Contributing

Contributions are welcome! Please ensure:

• Code follows existing patterns
• Arduino code includes proper error handling
• Mobile app code is properly tested
• Documentation is updated

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Note: This is a comprehensive IoT smart home system. Ensure all devices are properly configured and secured before deployment in production environments.