Arduino Lab Gas Monitor Kit – MQ-2 Sensor Alarm with Buzzer, Flashing LED, and Exhaust Control

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

In a school chemistry lab or college electronics workshop, invisible gas leaks can turn hazardous in seconds. This kit equips you to build an active ventilation safety system — the kind of proactive safeguard that CBSE lab manuals and Smart India Hackathon evaluators look for. By the time you finish, you’ll have a live gas monitor whose MQ-2 sensor watches for combustible fumes, then triggers a piercing buzzer, a mains-ready exhaust fan relay, and a trio of alert LEDs the moment the safe ppm limit is crossed.

What You'll Build

A tabletop safety unit centred on an Arduino Uno that continuously samples air quality. Once the MQ-2’s analog reading surpasses your calibrated threshold, the active buzzer blares, the 5V relay switches on a 12V exhaust fan (or any ventilation device you connect), and three red LEDs flash in unison — ensuring the alarm is seen and heard even in a noisy lab environment. The result is a complete ventilation‑response system that you can demonstrate in action using a small fume source.

What You'll Learn

• Reading MQ‑2 analog output and converting it to real‑world ppm thresholds for methane, LPG, and smoke
• Calibrating sensor sensitivity using the serial monitor so the alarm triggers only above genuinely unsafe concentrations
• Wiring a 5V relay module with a flyback diode to safely switch a 12V exhaust fan without damaging the Arduino
• Coding conditional logic that simultaneously activates a buzzer, flashing LEDs, and a relay based on a single analog threshold

Kit Contents