Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Model Number	MQ-2
Detection Gases	LPG, Propane, Hydrogen, Methane, Carbon Monoxide, Smoke
Operating Voltage	5V DC
Output Signal	Digital Switch Output (0 and 1) & Analog Voltage Output
Preheat Time	24-48 hours for stable readings
Sensitivity Adjustment	Adjustable via onboard potentiometer
Interface Type	3-pin connector (VCC, GND, DO/AO)
PCB Dimensions	32mm x 20mm x 15mm
Compatibility	Arduino, Raspberry Pi, STM32, ESP8266
Package Contents	1x MQ-2 Sensor Module, 1x Pin Header Strip

6 reviews

Anonymous

Mar 31, 2026

Rating: 4/5

Easy to interface

Wiring was straightforward. The library support for Arduino is abundant. My only minor complaint is that the pin headers weren't soldered on, but that's standard for these modules.

Anonymous

Mar 29, 2026

Rating: 4/5

Good value but needs warm-up

Great little module for the price. Just remember it needs a long preheat time before the readings stabilize. Once warmed up, it detects smoke from a blown-out candle instantly.

Anonymous

Mar 28, 2026

Rating: 5/5

Perfect for my home safety project

This sensor works exactly as described. I integrated it with an Arduino to monitor my garage for gas leaks. The analog output is smooth and the digital threshold is easy to set with the screw.

Anonymous

Mar 19, 2026

Rating: 3/5

Works well after calibration

Took some trial and error to get the code right, but the hardware itself is solid. Make sure you read the datasheet regarding the heating element current requirements.

Anonymous

Mar 07, 2026

Rating: 5/5

Reliable and sensitive

I've tested this against a professional meter and the correlation is surprisingly good for a hobbyist component. Highly recommended for air quality monitoring prototypes.

Anonymous

Mar 05, 2026

Rating: 5/5

Essential for IoT projects

Using this in a smart home setup to trigger an exhaust fan when cooking fumes are detected. It responds quickly and the sensitivity adjustment allows me to fine-tune it perfectly.

5 FAQ

Q: How long does the sensor last?

A: Under normal operating conditions, the sensing element typically lasts between 1 to 2 years depending on the concentration of gases it is exposed to.

Q: Does this come with a library for Arduino?

A: We do not provide a proprietary library, but there are many open-source libraries available in the Arduino Library Manager compatible with MQ-2 sensors.

Q: Does this module detect natural gas?

A: Yes, the MQ-2 is sensitive to methane, which is the primary component of natural gas, as well as LPG and propane.

Q: Is the output analog or digital?

A: It provides both. The AO pin gives an analog voltage proportional to gas concentration, and the DO pin gives a digital high/low signal when a threshold is crossed.

Q: Can I connect this directly to a 3.3V microcontroller?

A: The sensor heater requires 5V. While the logic output might work with 3.3V, we recommend using a level shifter or running the VCC at 5V for optimal performance.

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

3-Wire/4-Wire Flame Sensor Module, Fire Source Detection with IR Receiver, Flame Detection and Alarm

$1.08

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

Digital 38KHz Infrared Receiver Transmitter Head Sensor Module Electronic Building Blocks Robot Infrared Communication Remote Control

$2.29

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

HX711 Pressure Sensor Module Electronic Scale Bracket Weighing DIY Scale Pan Tray Set 5/10/40kg200

$3.28

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

Digital 38KHz Infrared Receiver/Transmitter Head Sensor Module for Electronic Building Blocks Robots, Infrared Communication Remote Control

$2.80

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

MPU-9255 9-Axis Attitude 3-Axis Electronic Compass Accelerometer Gyroscope Magnetic Field Sensor Module

$13.42

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