MQ 2 Gas sensor for Gas & Smoke Detection

MQ‑2 Gas & Smoke Sensor – Environmental Sensors
The MQ‑2 is a compact, low‑cost semiconductor sensor that detects a wide range of combustible gases (propane, methane, butane, LPG, hydrogen) and smoke with rapid response times. Designed to interface directly with Arduino, Raspberry Pi, or any micro‑controller via its simple analog and digital pins, the sensor provides real‑time voltage output that can be calibrated to specific concentration thresholds. Its robust housing and built‑in heating element make it ideal for classroom labs, maker projects, and outdoor field experiments where students need reliable air‑quality data.

With the MQ‑2, students explore core STEAM concepts: they learn the chemistry of oxidation reactions, program micro‑controllers to read and graph sensor data, apply statistical analysis to track pollutant trends, and design engineering solutions such as fire‑alert systems or smart ventilation. Key features include a wide detection range (200 ppm – 10 % LEL), adjustable sensitivity via a potentiometer, built‑in LED indicator, and a clear datasheet for easy calibration. By integrating this sensor into interdisciplinary projects, learners experience hands‑on problem solving, data‑driven decision making, and the real‑world impact of environmental monitoring, making the MQ‑2 an essential tool for any STEAM curriculum.