Smoke Gas LPG Butane Hydrogen Gas Sensor - MQ-2

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MQ-2 Smoke, LPG, and Combustible Gas Sensor Module

Protect your home, lab, or industrial projects with the highly versatile MQ-2 Gas Sensor Module. This essential safety component is engineered to detect a wide spectrum of combustible gases and smoke in the air, making it the perfect choice for building early-warning gas leak detectors, fire alarms, and environmental monitoring systems.

Utilizing a high-quality SnO2 (Tin Dioxide) sensing layer, the module exhibits low conductivity in clean air. When target gases are present, the sensor's conductivity rises in direct proportion to the gas concentration, allowing your microcontrollers to read precise environmental changes instantly.

Key Features

• Wide-Spectrum Gas Detection: Highly sensitive to LPG (Propane/Butane), Smoke, Hydrogen (H2), Methane (CH4), Alcohol, and Propane, giving you comprehensive coverage against multiple fire and asphyxiation hazards.
• Dual Output Modes (Analog & Digital):
  • Analog Output (AO): Outlines real-time gas concentration levels, giving you exact data for graphing trends or setting intelligent, multi-stage thresholds.
  • Digital Output (DO): Generates a clean High/Low signal using an onboard LM393 voltage comparator, ideal for tripping simple alarms without heavy programming.
• Adjustable Sensitivity: Features an onboard precision potentiometer (trimmer), allowing you to calibrate the digital threshold to ignore minor background anomalies or fine-tune it for ultra-fast triggering.
• Rapid Response & Recovery: Built for critical safety setups, boasting an incredibly fast response time to ensure your system can sound alarms or trigger ventilation systems immediately upon exposure.
• Long-Term Stability: Designed with a robust internal heater structure that maintains stable operational temperatures for reliable, repeatable readings over extended periods.

Specifications

• Sensing Core: MQ-2 Gas Sensor
• Operating Voltage: $5\text{V}$ DC
• Current Consumption: ~ $150\text{mA}$
• Detection Range:
  • $300$ to $10,000\text{ ppm}$ (Combustible Gas)
  • $100$ to $10,000\text{ ppm}$ (Smoke)
• Output Pins: VCC ($5\text{V}$), GND, DO (Digital), AO (Analog)
• Comparator IC: Onboard LM393
• Module Dimensions: Approx. $32\text{mm}\times 20\text{mm}\times 22\text{mm}$

Common Applications

• Smart Home Safety: Building DIY kitchen gas-leak detectors (LPG/Butane) or smart smoke alarms tied into Home Assistant or Blynk.
• Industrial Monitoring: Monitoring manufacturing lines or workshops for hazardous gas buildups or volatile chemical vapors.
• Robotics & Rovers: Creating autonomous hazardous-environment inspection rovers equipped to seek out or flag air quality issues.

Pro-Tip for Builders: Like all chemical-metal oxide sensors, the MQ-2 requires a brief warm-up period (usually 20—60 seconds, or up to 24 hours for the very first initialization) to burn off residual moisture and stabilize before it provides perfectly accurate readings.