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MQ-2 Combustible Gas Sensor Module

SKU: Q4P607YCRV
★★★★ ★ ★
4.9 (94 reviews)
The MQ-2 Combustible Gas Sensor Module is a semiconductor-based gas detection module designed to detect a wide range of flammable gases and smoke, including LPG, methane (CH₄), propane, hydrogen, alcohol vapors, carbon monoxide (CO), and smoke. Built around the MQ-2 gas sensor and an onboard LM393 voltage comparator, the module provides both analog (AO) and digital (DO) outputs for seamless...
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The MQ-2 Combustible Gas Sensor Module is a semiconductor-based gas detection module designed to detect a wide range of flammable gases and smoke, including LPG, methane (CH₄), propane, hydrogen, alcohol vapors, carbon monoxide (CO), and smoke. Built around the MQ-2 gas sensor and an onboard LM393 voltage comparator, the module provides both analog (AO) and digital (DO) outputs for seamless integration with microcontrollers. The sensor uses a tin dioxide (SnO₂) sensing element whose conductivity increases in the presence of combustible gases, enabling reliable gas detection.

Operating from a 5V DC supply, the module features an adjustable sensitivity potentiometer that allows users to set the digital output threshold according to their application. It offers fast response, long operational life, and stable performance, making it ideal for gas leakage alarms, smoke detection systems, industrial safety equipment, smart home automation, environmental monitoring, and educational electronics projects. Compatible with Arduino, ESP32, STM32, Raspberry Pi (with ADC where required), PIC, AVR, and other microcontrollers, the MQ-2 module is one of the most widely used gas sensors for combustible gas detection.

Key Features

  • Based on the MQ-2 semiconductor gas sensor
  • Detects combustible gases and smoke
  • Sensitive to LPG, methane, propane, hydrogen, alcohol, carbon monoxide, and smoke
  • Dual analog and digital outputs
  • Built-in LM393 voltage comparator
  • Adjustable sensitivity using onboard potentiometer
  • Fast response and recovery time
  • Stable and reliable performance
  • Long operational life
  • Power and output indicator LEDs
  • Operates from 5V DC
  • Easy interface with Arduino, ESP32, STM32, Raspberry Pi, AVR, and PIC
  • Compact PCB with mounting holes
  • Ideal for gas leakage alarms and safety monitoring applications

Shipping & Returns

Orders placed before 3 PM IST will be shipped on the same day (excluding Sundays and Public holidays) through our shipping partners. In rare cases, the pickup may get delayed during Public holidays / Bandh / Environmental disturbances.

Specifications

Specifications:

Module Type: Combustible Gas Sensor Module
Sensor Model: MQ-2
Sensor Technology: Semiconductor (SnO₂)
Comparator IC: LM393
Operating Voltage: 5V DC
Operating Current: Approximately 150mA
Heater Voltage: 5V ±0.1V
Heater Resistance: Approximately 31Ω ±3Ω
Heating Power Consumption: Less than 900mW
Target Gases: LPG, Methane (CH₄), Propane, Hydrogen, Alcohol, Carbon Monoxide (CO), Smoke
Detection Range: Approximately 300–10000ppm (Combustible Gases)
Output Type: Analog (AO) and Digital (DO)
Digital Output: TTL Logic Level
Analog Output Voltage: 0V–5V (Relative to Gas Concentration)
Sensitivity Adjustment: Onboard Potentiometer
Response Time: Fast Response
Recovery Time: Fast Recovery
Preheat Time: Recommended 24–48 Hours for Initial Calibration; Short Warm-Up Required Before Regular Use
Operating Temperature: -10°C to +50°C
Operating Humidity: Up to 95% RH (Non-Condensing)
Module Dimensions: Approximately 32mm × 22mm × 27mm
Mounting Type: PCB Module with Mounting Holes
Compatibility: Arduino UNO, Nano, Mega, ESP32, STM32, Raspberry Pi (with ADC where required), AVR, PIC, 8051 and other microcontrollers

Additional Resources

MQ-2.PDF

FAQ

1. What is the MQ-2 Combustible Gas Sensor Module used for?

The MQ-2 module is used to detect combustible gases such as LPG, methane, propane, hydrogen, alcohol vapors, carbon monoxide, and smoke. It is commonly used in gas leakage alarms, home safety systems, industrial monitoring, and IoT-based safety projects.

2. Does the MQ-2 module provide both analog and digital outputs?

Yes. The module provides an analog output (AO) that varies with gas concentration and a digital output (DO) with an adjustable detection threshold using the onboard potentiometer.

3. Can the MQ-2 sensor be used with Arduino and ESP32?

Yes. The MQ-2 module is compatible with Arduino, ESP32, STM32, AVR, PIC, and Raspberry Pi (with an external ADC where required). Its analog and digital outputs make it easy to integrate into embedded systems.

4. Why does the MQ-2 sensor require a preheating period?

The MQ-2 contains an internal heater that stabilizes the SnO₂ sensing element. An initial burn-in period of 24–48 hours is recommended for new sensors, followed by a short warm-up period before regular operation to ensure stable and accurate readings.

5. Which gases can the MQ-2 sensor detect?

The MQ-2 is highly sensitive to LPG, methane, propane, hydrogen, smoke, and alcohol vapors, and can also detect carbon monoxide and other combustible gases. Since it is a multi-gas sensor, it indicates the presence of combustible gases but cannot specifically identify which gas is present.