Smart Door Unlock System using ESP32 and MQTT | IoT Project Tutorial

Smart Door Unlock System using ESP32 and MQTT


In the era of smart homes and IoT, automating everyday tasks not only enhances convenience but also adds an extra layer of security to our living spaces. One such exciting project is the creation of a Smart Door Unlock System using ESP32 and MQTT. In this tutorial, we’ll guide you through the process of building your own PCB circuit, sharing the gerber file, and setting up the app on your smartphone to control the door lock.

Materials Needed for Smart Door Unlock:

Before diving into the project, make sure you have the following materials:

  • ESP32 development board
  • Electronic door lock mechanism
  • PCB components (as listed in the project documentation)
  • Smartphone with the app for MQTT control

Building the PCB Circuit for Door Unlock:

To get started, download the gerber file provided and send it to your preferred PCB manufacturer for fabrication. Once you have the PCB in hand, gather the necessary components and follow the step-by-step guide in the project documentation. The guide includes detailed instructions on soldering components onto the PCB, ensuring a seamless integration of the Smart Door Unlock System. Check this video to learn step by step to build your own PCB at home.

Setting Up the Development Environment:
To program the ESP32, we’ll be using the ESP-IDF (Espressif IoT Development Framework). Make sure to have the latest version of ESP-IDF installed on your computer. The project documentation includes a comprehensive guide on setting up the development environment, including instructions for installing dependencies, configuring the ESP32, and uploading the code to the board.

Understanding the Code:
Explore the provided code to gain insights into how the Smart Door Unlock System functions. The code is well-commented, explaining each section and its role in the overall operation of the system. This step is crucial for troubleshooting and making any customizations according to your specific requirements.

MQTT Integration for Smart Door Unlock:

MQTT (Message Queuing Telemetry Transport) is a lightweight and efficient messaging protocol widely used in IoT applications. Learn how to set up an MQTT broker, configure the ESP32 to communicate using MQTT, and establish a secure connection between the door lock system and your smartphone app. This part of the tutorial ensures that your door lock responds promptly to your commands through the MQTT protocol.

Download All Resources

Smartphone App Setup:
The tutorial also provides guidance on setting up the smartphone app for controlling the door lock. Whether you’re using a pre-existing app or building one from scratch, the tutorial walks you through the necessary steps to establish a connection between the app and the ESP32, allowing you to lock and unlock your door remotely.

In our case we will use IoT MQTT Panel app from play store, you can check the below image as reference to download it and start setting it up to automate your home.

Smart Door Unlock System using ESP32 and MQTT

Check this video for detailed understanding of the project.

By the end of this tutorial, you’ll have a fully functional Smart Door Unlock System, offering both security and convenience. The project not only provides an engaging hands-on experience in electronics and programming but also serves as a practical application of IoT principles. Embrace the future of home automation with this DIY project and take the first step towards transforming your living space into a smart home.

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