MQTT Smart Home Hub Kit with ESP32 + Relay
Build an MQTT Smart Home Hub with ESP32 & 4-Channel Relay — Control Lights, Fan, AC & Locks from Any App
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Imagine turning on your bedroom fan or deadbolting the front door from anywhere—using just your phone. This kit transforms that idea into a working prototype within a single afternoon. You’ll connect an ESP32 to a 4-channel relay, wire real AC appliances, and push commands through the MQTT messaging protocol—all while monitoring temperature and relay status on a crisp 0.96-inch OLED display.
What You'll Build
You’ll assemble a fully functional smart home control hub. The ESP32 acts as the brain, subscribing to MQTT topics and firing the relay to switch lights, fans, or a solenoid lock. A DHT22 sensor feeds room temperature and humidity data back to your app, and the OLED screen shows live relay states. Once programmed, you control every appliance from MQTT client apps like MQTT Dash or integrate with Home Assistant for a complete dashboard.
What You'll Learn
- Program ESP32 in Arduino IDE to publish and subscribe MQTT topics for real-time appliance control.
- Wire a 4-channel relay module safely to AC loads using 1N4007 flyback diodes and build a noise-free power circuit.
- Read DHT22 sensor data over OneWire and display it on an OLED via I2C protocol.
- Set up a local or cloud MQTT broker, structure topic hierarchies, and debug with serial monitor.
Kit Contents
| Component | Quantity |
|---|---|
| ESP32 Dev Board | x1 |
| 4-ch Relay Module | x1 |
| DHT22 | x1 |
| 0.96in OLED | x1 |
| 1N4007 Diode | x5 |
| 4.7kΩ Resistors | x5 |
| 100nF Caps | x5 |
| 400-pt Breadboard | x1 |
| M-M Wires | x20 |
| Micro USB Cable | x1 |
Why Buy This Kit Instead of Sourcing Parts Separately
| Factor | Sourcing Separately | Compoden Kit |
|---|---|---|
| Compatibility checks | You verify every part | Pre-tested as a system |
| Build support | Forums and scattered tutorials | AI companion trained on this exact project |
| Time to first working build | Days of debugging | Hours, with step-by-step guidance |
| Shipping coordination | Multiple sellers, multiple delays | One shipment from Bengaluru in 3-5 days |
Who This Kit Is For
Designed for CBSE Class 11–12 students exploring IoT and computer science, B.Tech ECE/EEE undergraduates working on mini-projects, and participants in Smart India Hackathon or ATL Tinkering Lab challenges. Students at IIT, NIT, VIT, and BITS Pilani will find it a ready-to-use prototyping bundle for MQTT-based home automation assignments.
Built and Backed by Compoden
Every Compoden kit ships with an AI build companion trained on this exact project — accessible via a QR code on the box, with WhatsApp and email backup. We've spent 10 years building projects for makers, schools, and institutions across India. If a part fails because of a manufacturing defect, replace it free within 7 days.
What if I get stuck during the build?
Scan the QR code on the box to chat with the AI build companion trained on this kit, or message us on WhatsApp for personal guidance from our maker-support team.
Can I control appliances from outside my home WiFi network?
Yes, the MQTT protocol works over the internet when you connect to a cloud broker like HiveMQ Cloud or Adafruit IO. The AI companion includes sample code for secure remote access.
Which MQTT broker should I use with this kit?
We recommend Mosquitto for local testing and a free cloud broker such as HiveMQ Cloud for first-time internet-based control. Both are covered step-by-step in the companion.
Is this kit compatible with Alexa or Google Home?
While this kit directly uses MQTT, you can bridge it to voice assistants using Home Assistant or Node-RED. The AI companion provides optional integration guides for popular platforms.
ESP32 MQTT controls lights, fan, AC relay and lock from any MQTT client app.
What's in this kit
- ESP32 Dev Board
- 4-ch Relay Module
- DHT22
- 0.96in OLED
- 1N4007 Diode x5
- 4.7kΩ Resistors x5
- 100nF Caps x5
- 400-pt Breadboard
- M-M Wires x20
- Micro USB Cable
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Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items