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MQ-4 Natural Gas Sensor Module For Methane(CNG) gas Detector Module

MQ-4 Natural Gas Sensor Module For Methane(CNG) gas Detector Module

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  • This is MQ-4 Natural Gas Sensor Module
  • This has Good sensitivity to Combustible gas in wide range
  • This has High sensitivity to CH4, Natural gas.
  • This has Fast response Stable and long life
  • This has Simple drive circuit

MQ-4 Natural Gas Sensor Module

This is a straightforward MQ-4  Gas Sensor Module that detects the presence of Compressed Natural Gas (CNG), methane (CH4), and other gases in the air. Our MQ-4 sensor is used in the module. It simplifies the interface to the sensor's odd pin spacing by providing the interface via standard 4 x 0.1′′ header pins.
It has an analogue output that corresponds to the concentration of gases in the air and a simple digital output. The onboard potentiometer can be used to set the maximum gas concentration that will trigger the digital output. The MQ-4 sensor is capable of detecting natural gas concentrations ranging from 200 to 10000ppm.
Simply connect the MQ 4 sensor module to 5V, set the threshold, and you can begin measuring the gas concentration in the air around the sensor! The presence of any gas is indicated by an onboard LED. Microcontrollers and other circuits can easily interface with the digital output. The analogue output can be connected to a microcontroller's ADC to obtain a wide range of sensor readings.
This is a simple compressed natural gas (CNG) sensor for sensing natural gas concentrations in the air (mostly Methane [CH4]).
If you want to use this MQ-4 Gas Sensor Module with Arduino, for that you will need 


  • Signal output indicator
  • Dual Signals output (analog output and TTL output)
  • The TTL output signal is low level, allows to connect with SCM directly
  • High sensitivity
  • Long working life and stable performance
  • Quick response and recovery.

Read our blog MQ sensor where we explained what is a gas sensor, what is 1ppm equal to, MQ sensor list of different series and their features.

MQ-4 Natural Gas Sensor Module pin description

MQ-4 Natural Gas Sensor Module pin Diagram

MQ-4 Natural Gas Sensor Module pin description

1 AO Analog output (Sensor data output in analog form)
2 DO Digital output (Sensor data output in digital form)
3 GND To -ve of power supply
4 VCC To +ve of power supply


  • Domestic gas leakage detector
  • Industrial Combustible gas detector
  • Portable gas detector

Package Includes:

  • 1 x MQ4 Gas Sensor Module


Model  MQ4 Gas Sensor Module 
IC Chip LM393
Operating Voltage  3 ~ 5V (DC) 
Detecting Range 300ppm to 10000ppm
Dimensions  3.1 x 1.9 x 2.1 cms
Weight  5 grams

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  • Delivery time in Metro cities is 1-3 days, Others it is
    3-7 days. It varies based on location, reliant on courier services
  • Return window: 7 days from receipt unless stated
    otherwise. No refunds/replacements after
  • Returns only for non-working/damaged products are accepted
  • Initiate return requests to our customer service team via Support ticket or contact us at +91-8123057137
  • Refunds are processed within 3-4 working days post inspection and approval.

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1. What are gas sensors? How do they work?

  • Gas sensors (also known as gas detectors) are electronic devices that detect and identify different types of gasses. They are commonly used to detect toxic or explosive gasses and measure gas concentration. 
    Gas sensors detect the presence or concentration of gases in the atmosphere. Based on the concentration of the gas the sensor produces a corresponding potential difference by changing the resistance of the material inside the sensor, which can be measured as output voltage. Based on this voltage value the type and concentration of the gas can be estimated.

2. How to use the MQ4 Gas Sensor?

  • As soon as the module is powered, the power LED lights up. The MQ-4 works by sensing the methane concentration in the air. The analog pin of the sensor then generates an analog signal proportional to the amount of CH4 in the air. We can measure the analog output of a sensor with an ADC microcontroller. The microcontroller then converts the measured analog voltage into Methane concentration in the air. Based on this measurement, we can take proper actions such as alarm triggering, etc. 
    Similarly, the same goes for the digital output pin of the MQ4 methane sensor. When methane gas is detected, the digital pin goes HIGH and the Digital output inbuilt led glows up. This digital pin can also be used for different activities being commanded by a microcontroller.