Build a Tiny BLE HVAC Sensor Beacon with ESP32-C3

Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.

Place this coin-cell-sized sensor near an AC vent, and your phone will pick up real-time temperature and humidity-without pairing, without an app, just by scanning for BLE advertisements. The HVAC Performance Monitor Kit turns an ESP32-C3 into a broadcast-only beacon, giving you instant, wire-free monitoring of any space.

What You'll Build

You'll assemble a battery-powered ESP32-C3 board that reads a DHT22 sensor and continuously transmits the readings as a BLE advertisement. Open any free BLE scanner app on your phone and you'll see temperature and humidity update every second-no passwords, no pairing pop-ups. It's the quickest way to make a discrete, low-power environmental monitor.

What You'll Learn

• How BLE advertising packets work-from raw data to phone interpretation
• Programming an ESP32-C3 to read and format sensor values
• Structuring a custom advertising payload with temperature and humidity
• Using free mobile apps to read BLE broadcasts from any device

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

Ideal for ATL Tinkering Labs and school STEM clubs where students 10+ move from simple breadboard circuits to wireless IoT. CBSE Class 10-12 learners can use it to demonstrate BLE communication in their final project. Hobbyists who want a quick, no-solder way to monitor air conditioner performance will have a working beacon in under three hours.

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.