Automated Dehumidifier Controller Kit with Arduino Uno + DHT22
Automated Dehumidifier Controller Kit — Arduino Uno + DHT22 Smart Home Automation
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Moisture creeping into your storeroom, wardrobe, or electronics cabinet? This kit turns an Arduino Uno into a smart dehumidifier controller that switches on a dehumidifier whenever humidity crosses a preset threshold — and logs long-term humidity trends to a microSD card so you can see exactly when dampness hits. No guesswork, no forgotten switches, just data-driven climate control you build yourself.
What You'll Build
You'll assemble a compact control unit with an OLED screen that shows real‑time humidity, temperature, and relay status. A DS3231 real‑time clock timestamps every reading, and a microSD module stores a CSV log you can open in Excel. When the DHT22 sensor detects humidity above your set point, the relay activates your dehumidifier; a diode‑protected circuit ensures clean power without glitches.
What You'll Learn
- Interface the DHT22 digital humidity sensor and calibrate threshold-based control logic
- Write Arduino code to timestamp sensor readings with DS3231 RTC and save structured log files to SD card
- Use a relay module safely with flyback diodes to switch AC mains appliances
- Display sensor and status data on a 0.96‑inch OLED screen using I2C communication
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‑level project is ideal for CBSE Class 11–12 students exploring data logging and automation, B.Tech ECE/EEE undergraduates building a sensor‑driven home automation portfolio, and teams participating in Smart India Hackathon or ATL Tinkering Lab challenges who need a reliable humidity control module. It fits IIT, NIT, VIT, and BITS electronics lab assignments that require real‑time sensing and SD card storage.
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?
Your AI companion will show you wiring diagrams specific to this kit, and you can send photos via WhatsApp for extra guidance from our support team.
Can I modify the humidity threshold after building?
Yes, the Arduino sketch reads the threshold from a variable you can easily change in the code, or you can later add buttons to adjust it live on the OLED screen.
Does this kit include a dehumidifier unit?
No, you connect the relay output to your own dehumidifier or exhaust fan. The kit provides the control logic, power isolation, and logging system.
What SD card size is supported, and is the log readable in Excel?
The microSD module works with FAT32 cards up to 32 GB. Logs are saved as timestamped CSV files with humidity, temperature, and relay state columns — directly importable into Excel or Google Sheets.
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