Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Sensor Type	MQ-4 Methane and Natural Gas Detector
Connector Interface	PH2.0 Anti-Reverse Plug
Compatibility	LEGO Mindstorms, Arduino, Raspberry Pi
Operating Voltage	5V DC
Output Signal	Digital Switching Output (0 and 1)
Sensitivity Adjustment	Adjustable via Onboard Potentiometer
Indicator	Red Power LED and Green Detection LED
PCB Dimensions	32mm x 22mm
Mounting Holes	Standard 3mm spacing for LEGO Technic pins
Warm-up Time	Approximately 20-60 seconds

6 reviews

Anonymous

Mar 29, 2026

Rating: 4/5

Great value, needs warm-up

Works well with Arduino Uno. Just remember it needs a minute to warm up before readings stabilize. The adjustable sensitivity knob is very useful for calibrating false alarms.

Anonymous

Mar 26, 2026

Rating: 4/5

Good sensitivity range

Detection range is impressive for the price point. I had to tweak the potentiometer slightly to ignore ambient humidity, but once set, it works flawlessly.

Anonymous

Mar 26, 2026

Rating: 5/5

Son loves it

My son used this to build a kitchen safety robot. It was easy to integrate with his existing LEGO setup. The documentation provided by the seller was also helpful.

Anonymous

Mar 17, 2026

Rating: 5/5

Perfect for LEGO Robotics Projects

This sensor fits perfectly into my LEGO Mindstorms EV3 creations. The PH2.0 connector prevents accidental reverse polarity, which has saved my board before. Detects cooking gas leaks reliably during testing.

Anonymous

Mar 11, 2026

Rating: 5/5

Excellent for Classroom Demos

Bought five of these for our high school robotics club. Students love the plug-and-play nature with LEGO bricks. Safe and effective for demonstrating gas detection principles.

Anonymous

Mar 03, 2026

Rating: 5/5

Robust and Reliable

The anti-reverse feature is a game changer for beginners. The module is sturdy and the LEDs provide clear visual feedback. Highly recommended for DIY safety projects.

5 FAQ

Q: Does this work directly with LEGO Mindstorms NXT?

A: Yes, it is compatible with NXT, but you may need a simple adapter cable depending on your specific brick port configuration, as it uses the standard PH2.0 interface.

Q: How do I adjust the sensitivity?

A: There is a blue potentiometer on the board. Use a small screwdriver to turn it clockwise to increase sensitivity or counter-clockwise to decrease it while exposing the sensor to test gas.

Q: Can I use this outdoors?

A: While it can function outdoors, wind and rapid temperature changes may affect sensitivity. It is best suited for indoor or sheltered environments for accurate readings.

Q: Is the cable included in the package?

A: Yes, the module comes with a short PH2.0 connection cable compatible with most standard sensor ports used in educational robotics kits.

Q: What specific gases does the MQ-4 detect?

A: The MQ-4 is primarily sensitive to methane (CH4) and natural gas. It also has some sensitivity to LPG and propane, making it ideal for home leak detection simulations.

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