Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Model Number	MQ-2
Detection Gases	LPG, Propane, Hydrogen, Methane, Smoke
Operating Voltage	5V DC
Output Signal	Digital Switch Output (0 and 1) & Analog Output
Preheat Time	24 Hours (Recommended)
Sensitivity Adjustment	Potentiometer included for threshold tuning
Interface Type	3-Pin Header (VCC, GND, DO/AO)
Compatible Boards	Arduino, Raspberry Pi, STM32, ESP8266
Dimensions	32mm x 20mm x 15mm
Mounting Holes	4 x 3mm diameter holes for secure installation

6 reviews

Anonymous

Mar 31, 2026

Rating: 4/5

Reliable detection

Used this in a prototype for a kitchen gas leak detector. It responds quickly to lighter fluid vapors. Note that this is a sensor module for development, not a certified standalone safety device.

Anonymous

Mar 21, 2026

Rating: 5/5

Excellent sensitivity range

The dual output (analog and digital) is very useful. I used the analog pin to graph gas levels over time and the digital pin to trigger a buzzer alarm. Works flawlessly with 5V logic.

Anonymous

Mar 16, 2026

Rating: 4/5

Good value but needs warm-up

Great little module for the price. Just remember that it needs a significant warm-up period before the readings stabilize. Once heated up, the sensitivity is quite good for educational purposes.

Anonymous

Mar 14, 2026

Rating: 5/5

Perfect for my home safety project

This sensor works exactly as described. I connected it to an Arduino Uno and had it detecting simulated smoke within minutes. The analog output allows for precise reading of gas concentration levels.

Anonymous

Mar 09, 2026

Rating: 5/5

Easy to integrate

I was worried about the wiring, but the pins are clearly labeled. The potentiometer makes it very easy to adjust the sensitivity threshold for the digital output pin. Highly recommended for beginners.

Anonymous

Mar 04, 2026

Rating: 3/5

Works well after calibration

Took some trial and error to get the calibration right for our specific environment, but once set, it performs consistently. Make sure you have a clean power supply to avoid noise in the analog reading.

5 FAQ

Q: How long does the sensor last?

A: Under normal operating conditions, the sensing element typically has a lifespan of 1 to 2 years. Continuous exposure to high concentrations of corrosive gases may reduce this lifespan.

Q: Is the library available for Arduino IDE?

A: Yes, there are several open-source libraries available in the Arduino Library Manager. Simply search for 'MQ2' or 'Gas Sensor' to find compatible code examples for reading analog and digital values.

Q: Does this work with 3.3V microcontrollers like ESP32?

A: Yes, but with caution. The heater requires 5V for optimal performance. You can power the VCC with 5V and use a voltage divider on the signal output if your microcontroller GPIO is strictly 3.3V tolerant, or use a logic level shifter.

Q: Why is the LED on the module always on?

A: The power LED indicates the module is receiving electricity. The second LED is the digital output indicator; it lights up when the gas concentration exceeds the threshold you set with the potentiometer.

Q: Can this sensor detect carbon monoxide?

A: The MQ-2 is primarily designed for LPG, propane, hydrogen, methane, and smoke. For Carbon Monoxide detection, we recommend the MQ-7 sensor model which is optimized for CO.

Explore your interests

STC32G12K128 STC8H8K64U Microcontroller Small System Core Board Development Board Emulator

$16.50

Youxin Electronics_STM32H743IIT6 Core Board System Board Learning Board STM32 Development Board

$118.00

Arduino DUE Development Board 32-bit ARM Controller A000062 Italian Official Original Import with Cable

$299.00

Ultrasonic Sensor HC-SR04 Ultrasonic Distance Measuring Module Bracket US015-025-026-100

$3.16

Serial SHT20 Chip Temperature and Humidity Sensor Test, SHT30 Chip Measurement and Monitoring Module by Viter Intelligence

$11.00

High-Speed Yabo Smart Raspberry Pi 4B Motherboard Development Board Accessories RaspberryPi 2G/4G/8G RAM Py

$494.30

Magnetic Circular Counting Chips, Two-Sided Flip Coins for Elementary Math, Kindergarten Early Education, Ten-Frame Matrix, Addition/Subtraction within 10 & 20, Teaching Tools

$11.90

HC-SR501 Human Motion Infrared Sensor Module Compatible with Arduino micro:bit Eco-Friendly

$7.50

SANSI White Label Class A Glass Graduated Cylinder C18 Micro-Precision Demulsification Cylinder with Scale Measurement Includes Certificate Ground Joint Stopper Hexagonal Bottom Borosilicate Glass Lab Equipment

$3.68

EV2400 Battery Unlock Fuel Gauge Programmer MSP430 HPA500 Evaluation Module Interface Board SMBus

$323.00

Cube Three-View Teaching Aid with Grid - 3D Geometry Observation Tool for Grades 4-5 Math (2cm Cubic Blocks Set)

$15.10

OrangePi Orange Pi Zero3 Zero 3 Development Board Allwinner H618 Orange Pi

$228.00

Zave MAX30100 MAX30102 Module for Blood Oxygen, Wrist Heart Rate, Pulse, and Heartbeat Detection

$3.39

12V Stable Version Light-Control Switch No-Light Sensing with Extension Cable Photoresistor Plus Relay Module

$49.20

STM32 Smart Car 51 Microcontroller Arduino Obstacle Avoidance Chassis Kit Mecanum Wheel Robot Car

$40.80

Tech Small Production Small Invention DIY Piano Electronic Keyboard Real Playable Science Small Handmade DIY Materials

$33.00

[Youxin Electronics] GP2Y0E03 Infrared Distance Sensor Module 4-50cm Range

$23.65

Transparent 3D Geometric Model Perspective Decomposition Graphic Teaching Aid, Complete Set for Elementary Grades 1-6 Math

$6.80

DHT22 Single-Bus Digital Temperature & Humidity Sensor AM2302 Module Electronic Building Blocks

$10.42

E18-D80NK Infrared Photoelectric Switch Diffuse Reflection Obstacle Avoidance Sensor Module 3-80CM

$12.60

LAN8720 Module Network Module Ethernet Transceiver RMII Interface Development Board Xinwei Electronics

$7.85

STC15W408AS Core Board Minimum System Board 51 Microcontroller Development Board TTSOP20 Learning Board

$18.47

New Version MEGA2560 R3 Development Board, Improved MEGA2560 R3 with Sensor Expansion Board

$13.68

Gradient Visual Illusion Kit: Electric Rotating Assembly Toy for Maker DIY, Paintable Handmade Model

$8.72

51/AVR Microcontroller Core Development Board STC89C52RC/51MCU Experiment Board/ATMEGA32 Learning Board

$37.90

[Trial Pack] Xianlang Complete Cat Treat Sticks Meal Packs Main Course Cans Freeze-Dried Cat Food Sample Snacks Gift Set

$15.00

GY-30 302 Digital Light Intensity Illuminance Sensor BH1750FVI Module Light Sensor Ball

$7.41

Foldable Clothes Drying Rack Floor Standing Home Balcony Bedroom Hanging Clothes Quilt Drying Artifact Outdoor Cooling Rod Indoor Drying Rack

$47.10

Metal Detector Module Non-Contact Metal Induction Sensor Detection Module Metal Detector

$8.70

RV1103 Miniature Linux Development Board: RISC-V Vision and AI with Ethernet Port

$53.10

For Arduino Development Board R3 Mainboard Microcontroller Module Kit Programming Learning Board Sensor Suite

$78.00

Xuefen Geometry Stamping and Tracing Set for Grades 1-2, 3D and 2D Ink Pads, Math Learning Tools, Cube and Cuboid Models

$4.51

Rubber Tire Toy 4WD Smart Car Wheels Car Model Robot Accessories (Suitable for 2mm Axle)

$0.50

E18-D80NK Infrared Obstacle Avoidance Sensor Proximity Switch Smart Robot Car 10-80cm

$6.30

OPT3001/3002/3004 Ambient Light Sensor Module Measures Visible Light Density Digital Optical Sensor

$8.14

51 MCU Minimum System STC89C52 DIP40 Through-Hole Smart Car Main Control Board Learning Experiment

$19.80

Outdoor Adventure Kids' Insect Observation Box with Magnifying Glass, Boys & Girls Toy for Exploration, Butterfly Catching and Fish Scooping Tools

$7.80

Risym Laser Head Sensor Module Suitable for Laser Module Expansion Board Laser Sensor Development Board

$2.82

Freeze-Dried Chicken Treats for Dogs: Nutritious Weight-Gain Breast Meat Chunks for Puppies – Teeth Cleaning, Grain Mixing, Universal Use

$3.90

Soil Moisture Sensor Probe Soil Moisture Meter Detection Module Sensor Separate Probe

$2.39