HVAC Performance Monitor Advanced Kit with Arduino Uno + DHT22
Build an Autonomous Humidity-Controlled Dehumidifier with Arduino Uno and DHT22
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
As summers intensify across India, maintaining ideal indoor humidity is critical for comfort and preventing mold. This kit lets you build a smart monitor that automatically activates a dehumidifier when humidity exceeds a set threshold, while logging environmental trends to an SD card for later analysis. Whether you're a student prototyping for a science fair, a hobbyist enhancing home automation, or an engineering aspirant exploring IoT, this project delivers practical, code-driven climate control.
What You'll Build
A fully functional HVAC monitoring system that reads temperature and humidity from the DHT22 sensor, displays real-time data on an OLED screen, and toggles a relay to control a dehumidifier when humidity crosses the threshold you set. The system timestamps every reading using a DS3231 real-time clock and writes all data to a microSD card, creating a log you can analyze to understand humidity patterns in your room or lab.
What You'll Learn
- Connect and calibrate the DHT22 digital humidity sensor with Arduino Uno.
- Program threshold-based relay control to automate a 230V appliance (with external relay module).
- Interface a real-time clock (DS3231) and microSD module for accurate timestamped data logging.
- Display sensor data and system status on a 0.96-inch OLED screen, and structure code for a responsive loop.
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Uno R3 | 1 |
| DHT22 | 1 |
| 5V Relay Module | 1 |
| DS3231 RTC | 1 |
| MicroSD Module | 1 |
| 0.96in OLED | 1 |
| 1N4007 Diode | 3 |
| 10kΩ Resistors | 5 |
| 100nF Caps | 5 |
| 400-pt Breadboard | 1 |
| M-M Wires | 20 |
| 9V Battery Snap | 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
This intermediate kit is perfect for CBSE Class 11-12 students working on practical electronics or computer science projects, B.Tech ECE/EEE undergraduates prototyping automation systems, and ATL Tinkering Lab mentors guiding smart home experiments. It's also ideal for makers participating in Smart India Hackathon or those preparing technical submissions for IIT, NIT, VIT, or BITS Pilani internal fests and workshops.
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?
Every kit includes a QR code linking to an AI build companion, which knows every component and connection in this kit. You can ask it questions as you build, and if you prefer, reach our engineers via WhatsApp for personalized support.
Can I control a real 220V dehumidifier with this kit?
Yes. The 5V relay module switches the low-voltage side, and by wiring the relay's COM and NO terminals in series with your appliance's power cord (through a safe enclosure), you can toggle a 220V dehumidifier. Always consult an electrician for high-voltage connections.
How do I change the humidity threshold?
You can modify the threshold value in the Arduino sketch. The AI companion provides commented code where you simply update the `HUMIDITY_THRESHOLD` variable. After uploading, the system will trigger at your custom setting.
Does the SD card log work without an internet connection?
Absolutely. The DS3231 RTC module keeps time even when power is off, and data is stored locally on the microSD card. You can view the CSV file on any computer.
HVAC — DHT22 humidity above threshold triggers relay dehumidifier. Logs humidity trends to SD card.
What's in this kit
Other projects you can build
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