Build an Energy-Saving Window Fan Controller with Arduino Uno & 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.

Hot afternoons often force a choice between opening a window or switching on a fan—but which one actually cools the room while saving electricity? This kit turns that instinct into data-driven action. Using two DHT22 sensors inside and outside, an Arduino Uno compares real-time temperature and humidity, then drives a 5V DC fan only when the outdoor air would worsen indoor comfort. The result is a self-regulating cooling assistant that trims power bills without sacrificing a comfortable study space or workshop.

What You'll Build

A compact controller that continuously compares indoor and outdoor conditions via dual DHT22 sensors and drives a 5V DC fan through an L298N motor driver based on an Arduino decision algorithm. The 0.96-inch OLED displays temperature, humidity, and the recommended action—open window or run fan—helping you cut AC costs and reduce electricity bills with a fully functional, India-centric smart home prototype.

What You'll Learn

• Interfacing DHT22 temperature and humidity sensors and calibrating readings from two locations simultaneously
• Designing decision logic with if-else conditions that compare indoor and outdoor data to optimise energy use
• Controlling a DC fan motor using an L298N driver and Arduino PWM for gradual speed regulation
• Displaying real-time sensor values and messages on a 0.96-inch OLED via I2C communication

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

CBSE Class 11-12 students can use it for physics or informatics practices investigations on thermodynamics and sensor-based automation. B.Tech ECE and EEE undergraduates will find it ideal for mini-projects, while Smart India Hackathon teams can rapidly prototype an energy-monitoring module. It also fits ATL Tinkering Lab sessions in schools and early-year projects at IITs, NITs, VIT, or BITS Pilani.

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.