Build a Dew-Point Alert System for Window Condensation – Arduino Uno & DHT22 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.

Water dripping down your window pane isn’t just a nuisance—it fuels mould, warps wooden frames, and triggers allergies. This kit puts you in control by building a compact alarm that screams the moment humidity nears the dew point. No more guesswork, no more ruined curtains. You’ll wire a DHT22 sensor to an Arduino Uno, let it crunch real-time readings, and activate a bright blue LED plus buzzer when condensation is imminent. Perfect for a bedroom, classroom, or that bathroom corner where towels never dry.

What You’ll Build

You'll assemble a stand-alone alert unit that samples temperature and humidity every second, computes the dew point, and compares it against a safety threshold. When the gap closes and window fog is about to form, two blue LEDs fire up and an active buzzer sounds—giving you just enough time to crack open a window or turn on a dehumidifier. The entire build sits on a pluggable breadboard, and you can later house it in a 3D-printed case or mount it behind a curtain.

What You’ll Learn

• Read accurate humidity and temperature using the DHT22 digital sensor
• Understand dew point physics and its role in condensation on cold surfaces
• Write Arduino code that performs real-time comparisons and triggers outputs
• Wire an active buzzer and LEDs via current-limiting resistors on a breadboard

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

Aimed squarely at curious school students, this kit brings CBSE Class 11–12 physics and computer science concepts to life. It’s equally at home in an ATL Tinkering Lab, a B.Tech ECE first-year intro project, or a weekend build for a 10-year-old tinkerer. If you’ve ever noticed window condensation in your home and thought “I could fix that,” this kit hands you the tools and code to do exactly that.

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.