Product DescriptionThe MQ-2 Gas and Smoke Sensor Module is a robust and widely used electronic component designed to detect a broad spectrum of flammable gases and smoke in the ambient environment. Utilizing SnO₂ (tin dioxide) as its primary sensing material, it exhibits high sensitivity to liquefied petroleum gas (LPG), butane, propane, methane, alcohol, and hydrogen, while also effectively responding to smoke. This makes it an invaluable asset for safety and environmental monitoring systems.The main purpose of the MQ-2 module is to act as a crucial early warning system. In the presence of a target gas, the sensor's conductivity increases in direct proportion to the gas concentration. This analog signal can be easily processed by a microcontroller or converted into a digital output using an onboard comparator, allowing users to trigger alarms, turn on ventilation, or send alerts when gas levels exceed a safe threshold.Common applications include domestic gas leak alarms, industrial gas detectors, portable gas monitoring devices, and safety systems for RVs or boats. Due to its versatility and ease of use, it is a staple in STEM education and DIY electronics, frequently integrated into Arduino, Raspberry Pi, and other microcontroller-based projects for air quality and safety.The module offers features such as a dual output (analog and digital), an onboard potentiometer for sensitivity adjustment, and a power/signal LED indicator. This sensor provides immediate, actionable data, allowing users to create proactive safety systems that protect lives and property. It is best suited for makers, students, hobbyists, and professional electronic engineers looking for an affordable, reliable, and straightforward gas detection solution.Key FeaturesWide Detection Spectrum: Capable of detecting LPG, butane, propane, methane, alcohol, hydrogen, and smoke.Dual Output: Provides both analog and TTL-level digital outputs for flexible integration with microcontrollers.Adjustable Sensitivity: Features an onboard potentiometer to calibrate the sensor and set the digital trigger threshold.Fast Response: Offers rapid detection capabilities, enabling immediate system response to a gas presence.Power & Signal LEDs: Onboard LEDs clearly indicate the module's power status and signal activity.Simple Interface: Requires just four pins (VCC, GND, DO, AO) for standard connection, simplifying wiring.High Sensitivity: Utilizes tin dioxide (SnO₂) sensing material for high responsiveness to target gases.Long Life and Stability: Designed for reliable operation over time with minimal drift under normal conditions.Standard Mounting Holes: Includes a mounting hole for secure physical installation in custom enclosures.Educational Utility: Excellent tool for teaching gas sensing, analog-to-digital conversion, and industrial safety concepts.Technical SpecificationsSpecificationDetailProduct NameMQ-2 Gas Sensor ModuleModelMQ-2Part NumberMQ02-MODULEDimensionsApprox. 32mm x 20mm x 22mmWeightApprox. 10gVoltage5V DCCurrent<150mAMaterialMetal wire mesh, Plastic, Fiberglass PCBColorBlue board, Metal mesh, Black/CeramicCompatibilityArduino, Raspberry Pi, Microcontrollers (PIC, AVR, etc.)Package Contents1x MQ-2 Gas Sensor ModuleOperating Temp.Not officially specifiedOutput TypeAnalog (AO) and Digital (DO)Heating PowerApprox. 800mW