Automate Your Bathroom Exhaust Fan with Arduino Uno & DHT22 Smart Ventilation Kit

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

Transform a standard bathroom into a smart, moisture‑controlled space. Each time a hot shower spikes the humidity, the DHT22 sensor sends a reading to the Arduino Uno; if it crosses a programmable threshold, the relay module turns on your existing exhaust fan. Once humidity falls back to safe levels, the system switches off automatically — no manual intervention, no forgotten switches, and far less chance of mold or mildew.

What You'll Build

You’ll build a complete automatic exhaust fan controller that senses humidity in real time, displays current conditions on a crisp 0.96‑inch OLED screen, and time‑stamps every event using the DS3231 real‑time clock. The finished prototype fits on a breadboard and can later be encased to govern a real 230V bathroom fan, giving you a fully functional smart‑home module that runs on minimal power.

What You'll Learn

• Interface a DHT22 humidity and temperature sensor with Arduino Uno and read accurate data
• Control high‑voltage appliances safely using a 5V relay module and flyback diodes
• Display real‑time data and system status on an OLED screen while logging events with an RTC
• Write threshold‑based control loops that automate a real‑world electrical appliance

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

This intermediate project is ideal for CBSE Class 12 students who need a physics or computer science investigatory project that demonstrates sensor‑based automation. B.Tech ECE and EEE undergraduates will find it perfect for embedded systems labs and minor projects. The kit also fits Smart India Hackathon themes, ATL Tinkering Lab challenges, and hands‑on workshops at IIT, NIT, VIT, and BITS campuses — anywhere a ready‑to‑build smart‑home module adds real value.

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.