HVAC Performance Monitor Kit with ESP32 + DHT22
ESP32 HVAC Performance Monitor: Bridge MQTT to REST API with DHT22 & BMP280
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Modernise legacy HVAC monitoring systems by building a wireless sensor node that converts MQTT sensor telemetry into HTTP REST API calls with adapted JSON payloads. This kit equips you to deploy an ESP32-based monitor that reads temperature, humidity, and barometric pressure, then seamlessly integrates with older building management systems that only understand REST endpoints — a real-world skill demanded by IoT integration roles.
What You'll Build
You’ll assemble a compact HVAC performance monitor that logs dual DHT22 and BMP280 data, timestamps readings via DS3231 RTC, displays live values on an OLED, and bridges the ESP32’s MQTT client to a configurable HTTP REST API. The firmware transforms incoming JSON structures on the fly, enabling integration with dashboards that expect incompatible schemas — removing a common barrier in retrofitting smart buildings.
What You'll Learn
- Configuring an ESP32 as both MQTT subscriber and HTTP client concurrently with FreeRTOS task management.
- Parsing and restructuring JSON payloads between different API formats using ArduinoJson.
- High-accuracy environmental sensing with DHT22 (temperature/humidity) and BMP280 (pressure/altitude).
- Time‑stamping sensor logs with DS3231 RTC for time‑series analysis and compliance reporting.
- Implementing robust reconnection, payload validation, and error handling for unreliable networks.
Kit Contents
| Component | Quantity |
|---|---|
| ESP32 Dev Board | 1 |
| DHT22 | 2 |
| BMP280 | 1 |
| DS3231 RTC | 1 |
| LM2596 Buck Converter | 1 |
| 0.96in OLED | 1 |
| 4.7kΩ Resistors | 5 |
| 100nF Caps | 10 |
| PCB Prototype Board | 2 |
| Enclosure Box | 1 |
| 5V 2A PSU | 1 |
| Soldering Iron | 1 |
| Solder Wire | 1 |
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
Advanced engineering students (B.Tech ECE/EEE, M.Tech IoT) who need a capstone project demonstrating protocol interoperability. Also ideal for Smart India Hackathon participants building building‑automation solutions, ATL innovators pushing beyond basic sensors, and graduates preparing for embedded systems roles at IoT startups in Bengaluru, Hyderabad, and Pune.
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 to launch the AI companion trained on this kit; it provides step‑by‑step guidance. For additional help, reach out via WhatsApp — we respond within hours.
Can I adapt this kit to integrate with a specific legacy HVAC API I already have?
Yes. The MQTT‑to‑REST bridge code is modular; the AI companion will guide you through editing the JSON transformation logic and HTTP header configuration to match your target endpoint.
Do I need prior experience with MQTT and REST APIs?
Basic familiarity with Arduino IDE and C++ is required. The project is advanced, assuming you have wired a sensor before, but the AI companion explains MQTT publish/subscribe and REST client concepts in detail as you progress.
Does the kit include everything I need to start building immediately?
Absolutely. Along with all components, you receive a soldering iron, solder wire, and prototyping boards — no extra purchases needed.
HVAC — ESP32 bridges MQTT to HTTP REST API. Converts sensor payloads between JSON formats for legacy integration.
What's in this kit
Choose your assembly option:
- Soldering Kit — 25W soldering iron, 60/40 solder wire, flux, and small perfboard for permanent assembly.
- Breadboard Combo — 800-point full-size breadboard with 65-piece jumper wire pack for solderless prototyping.
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