Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Model Number	MQ-8
Detection Gas	Hydrogen (H2)
Operating Voltage	5V DC
Output Signal	Analog and Digital (TTL)
Sensing Range	100 - 10000 ppm
Preheat Time	Approx. 24 hours
Interface Type	3-pin header (VCC, GND, OUT)
Compatibility	Arduino, Raspberry Pi, ESP32
Dimensions	32mm x 20mm x 22mm
Weight	12 grams

6 reviews

Anonymous

Mar 31, 2026

Rating: 5/5

Great for university robotics lab

Bought five of these for our final year project involving fuel cell monitoring. They are easy to interface and the documentation provided by the seller was helpful. Highly recommended for educational purposes.

Anonymous

Mar 29, 2026

Rating: 4/5

Good value but requires patience

The hardware quality is solid for the price. Just remember that these metal oxide sensors need a long preheat time (about 24 hours) before calibration gives accurate results. Once heated, it detects hydrogen leaks reliably.

Anonymous

Mar 21, 2026

Rating: 5/5

Perfect for my hydrogen safety project

This sensor module works exactly as described. I connected it to an Arduino Uno and had readings within minutes after the initial warm-up. The analog output is stable and the digital threshold potentiometer is very sensitive.

Anonymous

Mar 18, 2026

Rating: 3/5

Works well but gets hot

The sensor functions correctly and detects hydrogen gas effectively. However, the heating element gets quite hot during operation, so ensure your enclosure has adequate ventilation. Otherwise, no complaints.

Anonymous

Mar 16, 2026

Rating: 4/5

Reliable detection, simple setup

We use these in our workshop to monitor battery charging stations. The response time is decent, and the LED indicator on the board is a nice visual cue. Make sure you have a proper 5V power supply.

Anonymous

Mar 04, 2026

Rating: 5/5

Exceeded expectations

I was worried about noise in the analog signal, but with a simple capacitor filter, the readings are very clean. The build quality feels robust enough for embedded prototypes.

5 FAQ

Q: How long does the sensor last before needing replacement?

A: Under normal operating conditions, the sensing element typically lasts 1 to 2 years. Lifespan depends on exposure to high concentrations of gas and continuous operation time.

Q: Can this detect methane or only hydrogen?

A: While the MQ-8 is specifically tuned for Hydrogen (H2), it may show some cross-sensitivity to other combustible gases like methane, but it is not calibrated for them. For methane, we recommend the MQ-4 model.

Q: What is the current consumption during operation?

A: The heater typically consumes around 150mA at 5V. Please ensure your microcontroller or power source can supply sufficient current.

Q: Does this module come with the comparator chip onboard?

A: Yes, the MQ-8 module includes the LM393 comparator chip, which allows for both analog voltage output and digital TTL output.

Q: Is there a library available for Arduino?

A: Since it outputs a standard analog voltage, you do not need a specific library. You can read the value using the standard analogRead() function in Arduino IDE. Many community examples are available online.

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

Thin Film Pressure Sensor Display, USB Rechargeable Flexible Resistive Pressure Digital Display Module, Wide Range Wireless

$20.00

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