Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Sensor Type	MQ-2 Semiconductor Gas Sensor
Detectable Gases	LPG, Propane, Hydrogen, Methane, Smoke, Alcohol
Operating Voltage	5V DC
Output Signal	Analog (0-5V) and Digital (TTL)
Preheat Time	Approx. 24 hours for stable readings
Sensitivity Adjustment	Adjustable via onboard potentiometer
Interface Pins	VCC, GND, DO, AO
PCB Dimensions	32mm x 20mm x 15mm
Compatibility	Arduino, Raspberry Pi, STM32, ESP8266
Package Includes	1x MQ-2 Sensor Module, 1x Pin Header Strip

6 reviews

Anonymous

Mar 30, 2026

Rating: 4/5

Solid performance

The build quality is decent for a budget sensor. It gets quite hot during operation, which is normal for this type of sensor, so ensure you have some airflow in your enclosure. Detects alcohol vapors very sensitively too.

Anonymous

Mar 30, 2026

Rating: 5/5

Reliable gas detection

We bought ten of these for our robotics club workshops. All of them worked out of the box. The dual output (analog and digital) gives flexibility depending on whether you need precise data or a simple alarm trigger.

Anonymous

Mar 29, 2026

Rating: 3/5

Works but consumes power

The sensor functions well for detection, but be aware it draws significant current due to the heating element. Not ideal for battery-powered applications unless you implement a sleep/wake cycle in your code.

Anonymous

Mar 25, 2026

Rating: 5/5

Perfect for my home safety project

This sensor works exactly as described. I connected it to my Arduino Uno and had it detecting smoke from a lit match within seconds after the preheat period. The analog output makes it easy to gauge concentration levels.

Anonymous

Mar 25, 2026

Rating: 4/5

Good value but needs patience

Great little module for the price. Just remember that it needs a good 24-hour burn-in time before the readings stabilize. Once warmed up, the sensitivity adjustment pot works well to fine-tune the digital trigger point.

Anonymous

Mar 17, 2026

Rating: 5/5

Excellent for university projects

Used this for our final year embedded systems project. It detected LPG leaks reliably during our testing phase. The documentation online is plentiful, making integration straightforward even for beginners.

5 FAQ

Q: Is the output voltage compatible with 3.3V microcontrollers like ESP32?

A: Yes, the analog output scales with the input voltage. If you power the module with 3.3V, the analog output will range from 0-3.3V. However, the onboard heater performs best at 5V. You can power the VCC at 5V and use a voltage divider on the AO pin for 3.3V logic boards.

Q: What is the purpose of the blue potentiometer on the board?

A: The blue potentiometer adjusts the sensitivity threshold for the Digital Output (DO) pin. Turning it changes the resistance level at which the comparator switches the digital pin from HIGH to LOW, allowing you to set a specific alarm trigger point.

Q: Can this sensor detect carbon monoxide (CO)?

A: The MQ-2 is primarily designed for combustible gases like LPG, methane, and smoke. While it may show some reaction to CO, it is not optimized for it. We recommend the MQ-7 module specifically for Carbon Monoxide detection.

Q: Does this module come with a connector cable?

A: No, the package includes the sensor module and a strip of male header pins that you need to solder onto the board yourself. Jumper wires are sold separately.

Q: How long does the sensor need to warm up before use?

A: For accurate and stable readings, the sensor requires a preheat time of approximately 24 to 48 hours when first powered on. After the initial burn-in, it typically stabilizes within a few minutes of powering on subsequently.

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