Smoke-Triggered Air Freshener Kit with Arduino Uno – Beginner Project

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

Imagine an air freshener that only sprays when it detects smoke or foul odours, keeping your space fresh automatically and alerting you to potential hazards. This kit uses a real MQ-2 gas sensor and Arduino Uno to build that intelligent device. In just a couple of hours, you’ll have a working prototype that senses smoke, triggers a relay, and could control a small spray pump—an ideal introduction to environment sensing and practical automation.

What You'll Build

You’ll wire the MQ-2 sensor to read smoke concentration, program an Arduino threshold, and use a relay to switch an external spray pump (not included). The circuit includes indicator LEDs that glow red when smoke is detected, and a diode-protected relay circuit ensures safe switching. By the end, you’ll have a breadboard prototype that responds to real-world smoke just like a commercial air quality system.

What You'll Learn

• Wiring an MQ-2 gas sensor and calibrating its analogue output for smoke detection
• Programming an Arduino Uno to read sensor values and control a relay
• Using a relay module to switch higher-power devices safely while isolating the microcontroller
• Integrating a 1N4007 diode for flyback protection in relay circuits

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

Perfect for CBSE Class 11–12 students exploring sensor-based automation, B.Tech ECE/EEE first-years prototyping mini projects, and ATL Tinkering Lab innovators. Smart India Hackathon participants will find it a quick way to demonstrate air quality solutions. Suitable for ages 5–15 with minimal adult supervision, it’s a confidence-builder for any young maker interested in environment technology.

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.