MQ-2 Smoke Gas Sensor Module OverviewThe MQ-2 Smoke Gas Sensor Module is a high-sensitivity gas detector built to detect smoke and a variety of flammable and toxic gases such as carbon monoxide (CO), methane (CH4), propane (C3H8) and hydrogen (H2). With a broad detection range and an analog output that maps to 0-5V, it is ideal for smoke alarms, air quality monitoring and DIY safety systems.Key Features of MQ-2 Smoke Gas SensorDetects smoke, CO, methane, propane and hydrogen with high sensitivityWide detection range: 100 to 10,000 ppm for flexible monitoringAnalog output (0-5V) proportional to gas concentration for easy measurementFast response time (≤10 seconds) for prompt warningsDurable construction and long service life for reliable operationSimple 4-pin interface for plug-and-play integration with microcontrollersSpecificationsGases detected: Smoke, carbon monoxide (CO), methane (CH4), propane (C3H8), hydrogen (H2)Detection range: 100 to 10,000 ppmOperating voltage: 5V DCOutput type: Analog (0-5V)Response time: ≤10 secondsPreheat time: ≥24 hours for stable and accurate readingsOperating temperature: -20°C to 50°CDimensions: approx. 32mm x 22mm x 27mmApplicationsSmoke alarms and fire detection systemsHome, office and industrial safety monitoringAir quality and environmental monitoring projectsDIY electronics, robotics and smart home automationPrototype and product development for gas safety devicesIntegration with Arduino, Raspberry Pi and MicrocontrollersThe module provides a simple 4-pin interface for quick connection to controllers. Typical pinout:VCC: 5V power supplyGND: GroundA0: Analog output (0-5V) proportional to gas concentrationD0: Digital output (threshold switch on many modules) — check module variantBasic Arduino example: connect A0 to an analog input (A0), read the voltage and convert to a relative gas level. Remember to allow the module to preheat for at least 24 hours before calibration for stable results.Calibration and Best PracticesPreheat the sensor for at least 24 hours before first use to stabilize readings.Calibrate in fresh air to determine a baseline sensor resistance or voltage.Use moving averages or threshold logic to filter noise and prevent false alarms.Avoid exposing the sensor to high humidity, dust and corrosive gases for prolonged periods.Implement periodic checks and replacements in critical safety systems.Why Choose the MQ-2 Smoke Gas Sensor ModuleThe MQ-2 module combines affordability, wide-range detection and easy integration, making it a top choice for hobbyists, engineers and product designers building cost-effective smoke detection and air quality solutions. Its analog output and fast response time make it especially suitable for rapid alerting and continuous monitoring applications.Note: Images are for illustration purposes only. Categories: Boards, Modules and Accessories, Sensors And Modules Tags: Air Quality Sensor, Carbon Monoxide Sensor, Gas Detection Module, hydrogen sensor, MQ-2 sensor, propane sensor, smoke gas sensor College Road Electronics4.85 (317 Reviews)
