Build a Smart Door Lock with ESP32 and MQTT

11.12.2024 - Engine: Gemini

Building a Smart Door Lock with ESP32 and MQTT

Hardware

• ESP32 Module
• Relay Board
• Door Lock Actuator
• Power Supply
• Optional: RFID Module, Keypad, Display

Implementation

ESP32 Code:

• Set up MQTT client and connect to MQTT broker.
• Subscribe to MQTT topic to receive control commands.
• Publish door status to a different MQTT topic.
• Implement relay control to lock and unlock the door.
• Optionally, integrate RFID or keypad input for local authentication.

MQTT Server:

• Set up MQTT broker.
• Create topics for sending and receiving commands, and publishing status updates.
• Implement authentication and authorization for MQTT clients if required.

Security Considerations

• MQTT Security: Use TLS/SSL to encrypt MQTT communication and authenticate to the broker using username and password.
• Authentication: Implement a secure authentication method for controlling the door lock (e.g., RFID, PIN code).
• Monitoring: Monitor door status and report suspicious activity to MQTT broker or other monitoring solution.
• Firmware Updates: Ensure the door lock is regularly updated with the latest secure firmware.

Step-by-Step Instructions

1. Set Up Hardware: Connect the hardware components according to the schematic.
2. Flash ESP32 Code: Compile and flash the ESP32 code onto the module.
3. Configure MQTT Server: Set up MQTT broker and configure topics.
4. Configure Authentication: Implement authentication measures on ESP32 and MQTT server if required.
5. Test Door Lock: Test the door lock by sending commands via MQTT and receiving status.

Conclusion

Combining ESP32 and MQTT, you can create a secure and user-friendly smart door lock. By implementing security measures and monitoring it regularly, you can ensure your door remains reliably protected.