IoT-Based Automation and Security
An IoT-enabled home automation and security system integrating Arduino Mega & UNO, RFID access, multiple sensors, and Cayenne Cloud for real-time monitoring and remote control.
1. System Architecture
Architecture showing Arduino UNO handling RFID-based access control and Arduino Mega interfaced with multiple sensors, relays, and actuators, all connected to Cayenne Cloud via Ethernet Shield for IoT-based monitoring and automation.
2. Motivation
- Increasing demand for secure and energy-efficient home environments that can be controlled remotely. - Integration of IoT to provide real-time data collection and device automation. - Addressing the absence of low-cost, modular systems that combine security mechanisms such as RFID door locks with environmental monitoring. - Enhancing safety through automatic responses to events like gas leaks, intrusions, and abnormal environmental conditions.
3. Methodology
Technologies & Platforms: - Arduino Mega 2560 – Main controller for sensors and actuators. - Arduino UNO + MFRC522 RFID – Local door access control. - Ethernet Shield (W5100) – Provides Internet connectivity to Arduino Mega. - Cayenne Cloud + MQTT – IoT platform for dashboard monitoring and control. - Android App – Remote access to system controls and sensor data. Core Functionalities: 1. RFID-Based Door Lock – Unlock/lock doors with keycards or remotely via the Cayenne dashboard. 2. Intrusion Detection – PIR motion sensors trigger alarms or automatic lighting. 3. Gas/Smoke Detection – Automatic valve shutdown via servo motor upon leak detection. 4. Environmental Monitoring – Temperature, humidity, and soil moisture sensing. 5. Appliance Control – Relay modules switch lights, fans, and high-voltage devices. Integration Approach: - Arduino UNO handles RFID logic and relay for door locking. - Arduino Mega handles sensor monitoring, appliance control, and cloud communication. - Cayenne Cloud stores data, triggers automation, and provides a dashboard interface.
4. Hardware Components
Microcontrollers & Communication Modules
Arduino Mega 2560 serves as the main controller for sensors and actuators, connected to the internet via W5100 Ethernet Shield. Arduino UNO is dedicated to handling RFID authentication and controlling the door relay.
Sensors
Sensors include MFRC522 RFID for access control, PIR for motion detection, DHT11 for temperature/humidity monitoring, soil moisture sensor for garden irrigation alerts, and MQ-2 for gas/smoke detection.
Actuators
Actuators include a multi-channel relay module for switching high-voltage home appliances, and a servo motor for automatic gas valve control.
6. Key Features & Results
- Remote Access: Control appliances, lighting, and door locks via smartphone or web dashboard. - Real-Time Alerts: Push notifications for gas leaks, motion detection, and abnormal environmental readings. - Automated Safety: Servo-controlled gas valve automatically closes during leak detection. - Smart Garden Feature: Soil moisture sensor informs the user when garden watering is needed. - Energy Efficiency: Relays enable appliances only when necessary, reducing waste.
7. Future Scope
- Integrating HD IP cameras for 24/7 video surveillance. - Adding voice assistant compatibility (Alexa, Google Assistant). - Including water-level and vibration sensors for flood and earthquake alerts. - Implementing hybrid local + cloud control to maintain functionality during internet outages.