Build a Data Centre Temperature Monitor with ESP32 and DHT22 - IoT Kit with MQTT Relay Control

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 walking into a server room and seeing real-time temperature and humidity on a crisp OLED display, while your ESP32 silently talks to an MQTT broker. This kit turns that scenario into a functional build - a Wi-Fi connected monitor that publishes sensor readings on one set of topics and subscribes to relay commands on another, letting you control fans, alarms, or backup chillers from anywhere in the building.

What You'll Build

You'll assemble a complete environmental monitor on a breadboard. The OLED shows live temperature and humidity from the DHT22. The 4-channel relay module activates when your ESP32 receives an MQTT message on a dedicated topic - perfect for triggering cooling equipment or alert lights. Every relay channel switches independently, and you can test the system right on your desk by publishing commands from a phone or laptop.

What You'll Learn

• Publishing sensor data (temperature, humidity) to MQTT topics and subscribing to separate topics for relay actuation - real pub/sub IoT pattern
• Interfacing the DHT22 with ESP32 and correcting sensor placement to avoid self-heating errors
• Driving a 4-channel relay safely using flyback diodes and understanding inductive load switching
• Programming an I�C OLED to display live readings and MQTT connection status

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

If you are a B.Tech ECE or EEE student building an IoT lab project, this kit directly covers MQTT data pipelines and relay control. CBSE Class 11-12 students working on ATL Tinkering Lab prototypes will find the build clear and documented. Smart India Hackathon teams tackling IoT-based monitoring can get a working sensor-to-actuator chain in an afternoon. The project also suits IIT/NIT/VIT/BITS hobbyists who want a real-world data centre use case on their portfolio.

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.