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MQ-2 Gas and Smoke Sensor Module – High-Sensitivity LPG, Propane, Hydrogen, and Butane Detector for Home Security and Industrial Safety

Parameter	Detailed Specification
Sensor Type	Semiconductor Gas Sensor (SnO2)
Detecting Gases	LPG, Propane, Hydrogen, Butane, Methane, Alcohol, Smoke
Operating Voltage	5V DC
Load Resistance	Adjustable (Potentiometer)
Output Type	Dual (Analog & Digital)
Preheat Duration	>24 Hours (for stability)
Response Time	<10 Seconds

Price

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₹ 110.17

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Barcode: 7252

Product Description

Protect your environment with the MQ-2 Gas and Smoke Sensor Module, a versatile and high-sensitivity detector designed for both residential and industrial safety systems. The sensor utilizes a Tin Dioxide (SnO2) semiconductor layer that changes its conductivity based on the concentration of combustible gases and smoke in the air. This module is particularly effective at detecting LPG, Propane, and Butane, making it an essential component for gas leak alarms and fire detection projects. At Robogears, we provide this module with an integrated comparator circuit, offering both a precision analog output for concentration measurement and a digital trigger output with an adjustable threshold for easy integration with microcontrollers like Arduino, ESP8266, and Raspberry Pi.

Detailed Key Features

Wide Detection Spectrum: Capable of sensing a broad range of flammable gases including LPG, Propane, Hydrogen, and smoke, providing comprehensive environmental monitoring.
Dual Output Mode: Features an Analog output (A0) for real-time concentration tracking and a Digital output (D0) for simple "high/low" alert triggering.
Adjustable Sensitivity: Equipped with an onboard multi-turn potentiometer to calibrate the digital trigger point according to your specific environment.
Rapid Response & Recovery: Engineered to provide near-instant detection (under 10s) and quick recovery after the gas source is removed.
Long-Life Stability: Built with a robust SnO2 sensor element that offers high stability and a long operational life under standard conditions.

All Technical Details

Heater Voltage: 5V ±0.1V AC or DC for stable sensor operation.
Heater Consumption: Approximately 800mW.
Sensitivity Calibration: Detection range from 300 to 10,000 ppm.
Onboard LEDs: Power LED (indicates 5V supply) and Status LED (lights up when the gas threshold is reached).
Interface: Standard 4-pin header (VCC, GND, D0, A0) for simple jumper wire connectivity.

Prototyping & Engineering Tips (Robogears Exclusive)

The "Warm-up" Protocol: For accurate readings at your Pimpri workshop, the MQ-2 requires a burn-in period. New sensors should be powered for 24–48 hours initially to stabilize the chemical layer. For daily use, allow at least 60 seconds of warm-up time before trusting the data.
Heater Awareness: The sensor will feel warm to the touch during operation—this is normal, as the internal heater is required to facilitate the chemical reaction. Ensure your power supply can handle the ~150mA–180mA current draw.
Calibration Hack: To set the digital trigger, place the sensor in a "clean air" environment and turn the potentiometer until the status LED just turns off. Then, test it by briefly exposing it to a small amount of lighter gas (butane) to confirm the trigger works.
Safety Warning: While excellent for prototyping and monitoring, the MQ-2 should be used as a supplementary safety device. It should not be the sole safety mechanism in critical life-saving industrial systems without proper certification and redundant backups.

Package Includes

1 x MQ-2 Gas and Smoke Sensor Module

Image Disclaimer

Product images are shown for illustrative purposes only. The PCB layout, silkscreen color, or component brand may vary slightly based on the latest manufacturing batch, though all technical specifications and the MQ-2 sensor type remain as described.

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