Build an Automatic Air Freshener Smoke Detector with Arduino — A Smart Spray System 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.

Imagine walking into a room that always smells fresh, and a gentle spray of fragrance activates the moment it detects cigarette smoke or cooking fumes. With this kit, you’ll build exactly that: a smoke-triggered air freshener powered by the MQ-2 gas sensor and Arduino Uno. It’s a fun, practical project that teaches you to combine environmental sensing with real-world action, while adding a useful gadget to your home.

What You'll Build

By the end of this project, you’ll have a working prototype that uses an MQ-2 sensor to monitor air quality and activates a relay to switch on an air freshener spray pump (or any small DC pump) when smoke levels cross a user-set threshold. The two red LEDs indicate the system status and alert when it’s spraying. You can customise the sensitivity to respond only to heavy smoke or even light cooking vapours.

What You'll Learn

• How to interface the MQ-2 gas sensor and calibrate its smoke detection threshold
• Using a 5V relay module to control a high-power device like a spray pump
• Writing Arduino code to read analog sensor values and trigger outputs
• Building a practical home automation gadget from scratch on a breadboard

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

Young makers aged 8+ who want to build a useful home gadget. Perfect for CBSE Class 5–8 science projects, ATL Tinkering Lab sessions, or weekend tinkering at home. The step-by-step guide assumes no prior electronics experience, making it accessible for complete beginners who are curious about sensors and automation.

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.