MQ-2 Smoke LPG Butane Hydrogen Gas Sensor Detector Module
Review: 5 - "A masterpiece of literature" by John Doe, written onMay 4, 20020

MQ-2 Smoke LPG Butane Hydrogen Gas Sensor Detector Module

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  • Product SKU: KG051
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The MQ-2 sensor module is a popular gas detection module used in various electronics projects and applications.

Here's an overview and some details about the MQ-2 gas sensor:

Purpose: The MQ-2 is designed to detect various gases, including LPG (liquefied petroleum gas), butane, propane, methane, alcohol, hydrogen, and smoke.

Sensitivity: It has a high sensitivity to flammable gases. The sensor can work at temperatures ranging from -20 to 50°C.

Principle: It works on the principle that gases will cause the resistance of the sensing material to change. The sensor uses a tin dioxide (SnO2) sensitive layer whose resistance changes depending on the concentration of gases in the environment.


Analog and Digital Output: Typically, the MQ-2 sensor module provides both analog and digital outputs. The analog output can be used for reading the concentration of gases, while the digital output can be used as a trigger when gas concentration reaches a certain level.

Adjustable Sensitivity: Many MQ-2 modules come with a built-in potentiometer that allows users to adjust the sensor's sensitivity.

Low Cost: The MQ-2 is relatively inexpensive, making it a popular choice for DIY projects and various applications. Versatility: Because it can detect a variety of gases, it's a versatile choice for many different applications.


Safety: Used in gas leakage detecting equipment in families and industries, it's useful for detecting gas leaks that could lead to fires or explosions.

Air Quality Monitoring: Can be used to monitor indoor or outdoor air quality by detecting the presence of harmful gases. DIY Projects: Hobbyists and students use the MQ-2 in various electronics projects to detect the presence of gases.

Using the MQ-2:

Powering the Sensor: It typically requires a 5V DC power source. Calibration: For precise applications, you might need to calibrate the sensor in clean air to get a reference resistance value.

Reading Values: You can use a microcontroller (like Arduino) to read values from the sensor. The analog output can be read directly using an ADC (Analog to Digital Converter) pin on the microcontroller. The digital output can be connected to a digital input pin to get a high/low signal based on the set threshold.


Warm-Up Time: The sensor might require some time (typically a few minutes) to warm up and give accurate readings. Environmental Factors: Factors like humidity and temperature can affect readings. It's essential to consider this if precision is required.

Lifespan: Like all sensors, the MQ-2 has a limited lifespan, especially if exposed to high concentrations of gas for extended periods. To integrate the MQ-2 sensor into a system or project, you'll likely need additional components like a microcontroller, display (if you want to see readings), and other circuit components based on the specifics of your application.

    System Characteristics
    Parameter name Min Type Max Unit
    VCC Working Voltage 4.9 5 5.1 V
    PH Heating consumption 0.5 - 800 mW
    RL Load Resistance - can adjust - -
    RH Heater Resistance - 33 -
    Rs Sensing Resistance 3 - 30 kΩ

    The following conditions must be avoided

    Water Condensation: Indoor conditions, slight water condensation will affect sensors’ performance lightly. However, if water condensation on the surface of the sensor and keep a certain period, the sensor’s sensitivity will be decreased.

    Used in high gas concentration: No matter whether the sensor is electrified or not if a long time is placed in high gas concentration it will affect the sensor’s characteristics.

    Longtime storage: The sensor’s resistance produces reversible drift if it’s stored for a long time without electrifying, this drift is related to storage conditions. Sensors should be stored in airproof without silicone gel bags with clean air. For the sensors with long time storage but no electricity, they need a long aging time for stability before use.

    Longtime exposure to an adverse environment: No matter whether the sensors are electrified or not if exposed to an adverse environment for a long time, such as high humidity, high temperature, or high pollution, etc, it will affect the performance of the sensor badly.

    Vibration: Continual vibration will result in sensors’ down-lead response and then rapture. In transportation or assembling lines, a pneumatic screwdriver/ultrasonic welding machine can lead to this vibration.

    Concussion: If sensors meet strong concussion, it may lead its lead wire to disconnect.

    Technical Details

    • Operating Voltage (VDC): 5
    • Analog Output Voltage: 0V to 5V
    • Digital Output Voltage : 0V or 5V (TTL Logic)

    Physical Attributes

    • Length * Width * Height (mm): 36 x 20 x 21
    • Weight (gm): 7

    Integration with Arduino

    MQ-2 Sensor Module

    Sample Code


    • The domestic gas leakage detector
    • Industrial Combustible gas detector
    • Portable gas detector
    • Maintaining environmental standards  in hospitals
    • Air quality monitor
    • Safety standard maintenance

    Additional Details

    • Good sensitivity to Combustible gas in a wide range
    • High sensitivity to LPG, Propane, and Hydrogen
    • Long life and low cost
    • Simple drive circuit
    • Can be used as a digital or analog sensor
    • The Sensitivity of the Digital pin can be varied using the potentiometer
    • Can be used to measure or detect LPG, Alcohol, Propane, Hydrogen, CO, and even methane

    Product Video


    Package Includes

    • 1 x MQ-2 Smoke LPG Butane Hydrogen Gas Sensor Detector Module

    Customer Reviews

    Based on 18 reviews
    puneet jain
    It's a Toy

    This sensor is working perfectly. But this is a toy. Only suitable for demo. Not suitable for real life gas detection.

    sahil tigga

    Nice product. Works great even after 1 year of buying

    Great buy

    Loved it . The best for small projects . Totally worth the price

    Good product

    Good Product. Working fine

    Good performance

    Good gas sensitive sensor .can be use indoor use also

    amit kumar yadav

    Very accurate reading

    Yatendra Saraswat
    Good Product

    Nice product for my project. Thank you.

    William G Wilson

    Working as per requirement

    puran singh rastogi
    Five Stars

    Working good

    vivek sharma
    Good product

    Good product