ESP32 MQTT Home Automation System
Control and monitor home appliances remotely using ESP32 and MQTT protocol with a publish–subscribe IoT architecture.
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₹4401.00
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Components
7 items
Difficulty
Advanced
Build Time
2 – 3 hours
Project Details
How It Works
How It WorksThe ESP32 connects to a Wi-Fi network and establishes a connection to an MQTT broker. It subscribes to specific topics (e.g., 'home/relay1') to listen for commands. When a command like 'ON' or 'OFF' is published to the topic from a dashboard or app, the ESP32 receives it via the broker and toggles the relay accordingly. The relay then switches the AC appliance on or off. This publish–subscribe architecture allows multiple devices to communicate efficiently without direct connections.
Prerequisites
Basic knowledge of Arduino programming, understanding of Wi-Fi networking, familiarity with IoT concepts, and experience with electrical safety when working with AC mains.
What You'll Learn
What You'll LearnUnderstanding how MQTT works for IoT communication
Setting up ESP32 as an MQTT client
Connecting to and communicating with an MQTT broker
Designing systems that can grow with more devices
Controlling devices with minimal latency
Key Features
Immediate response to commands with low latency
Can easily add more devices and topics
Works with both cloud-based and local MQTT brokers
MQTT protocol is lightweight and efficient
Widely used in industrial IoT applications
What's Included in the Kit
| Component | Qty | Price |
|---|---|---|
 | 1 | ₹1682.00 |
 | 1 | ₹0.00 |
 | 1 | ₹0.00 |
 | 1 | ₹0.00 |
 | 1 | ₹171.00 |
 | 1 | ₹190.00 |
 | 1 | ₹0.00 |
Operating Instructions
Pin Connections
Pin Connections| MCU Pin | Connected To | Purpose | Notes |
|---|---|---|---|
| GPIO 2 | Relay IN | Digital signal to control relay state | Active LOW configuration in code |
| 5V | Relay VCC | Power supply for relay module | Ensure relay module is 5V compatible |
| GND | Relay GND | Common ground connection | Essential for proper circuit operation |
Tools Required
Tools RequiredSafety Precautions
Electrical
- ⚠Switch off main supply before wiring
- ⚠Use opto-isolated relay modules
- ⚠Keep low-voltage & high-voltage separate
- ⚠Use proper enclosure for AC connections
Frequently Asked Questions
Frequently Asked QuestionsQ:Can multiple appliances be controlled?
Q:Can a local broker be used?
Q:Is MQTT better than HTTP?
Q:Can sensors be added?
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