Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Sensor Type | MQ-8 Hydrogen Gas Sensor |
| Detection Range | 100 - 10000 ppm |
| Operating Voltage | 5V DC |
| Output Signal | Analog (AO) and Digital (DO) |
| Heater Voltage | 5.0V ± 0.2V |
| Load Resistance | Adjustable via Potentiometer |
| Preheat Time | Approx. 24 hours for stability |
| Interface | 3-Pin Header (VCC, GND, OUT) |
| PCB Dimensions | 32mm x 20mm |
| Compatibility | Arduino, Raspberry Pi, ESP32 |
Anonymous
Mar 18, 2026
Rating: 4/5
Good sensitivity, needs warm-up time
The sensor is quite sensitive to hydrogen gas. Just remember that it needs a significant warm-up period before readings stabilize. Once heated, it performs very well for industrial prototyping.
Anonymous
Mar 15, 2026
Rating: 4/5
Solid performance
Integration with ESP32 was seamless. The voltage levels are compatible without needing extra logic shifters. My only minor complaint is the pin header spacing, but standard jumper wires fit fine.
Anonymous
Mar 14, 2026
Rating: 5/5
Great value for money
I bought three of these for a university project. All three worked out of the box. The digital output threshold is easy to adjust, making it versatile for different alarm settings.
Anonymous
Mar 12, 2026
Rating: 5/5
Perfect for my hydrogen leak detector project
This module works exactly as described. The analog output is smooth and responds quickly to hydrogen sources. I used it with an Arduino Uno and the calibration was straightforward using the onboard potentiometer.
Anonymous
Mar 11, 2026
Rating: 5/5
Reliable for fuel cell monitoring
We are using this to monitor small leaks in a prototype fuel cell setup. It detects minute changes in concentration effectively. Highly recommended for R&D purposes.
Anonymous
Mar 03, 2026
Rating: 3/5
Works but gets hot
The sensor functions correctly, but the heating element gets very hot during operation. Make sure your enclosure has proper ventilation. Otherwise, the data accuracy is good.
Q: Does this module require a separate library for Arduino?
A: No specific library is required. You can read the analog value using the standard analogRead() function and map it to ppm values based on your calibration curve.
Q: Can this detect natural gas or only hydrogen?
A: The MQ-8 is specifically tuned for hydrogen gas. While it may react slightly to other combustible gases, it is not calibrated for natural gas (methane). We recommend the MQ-5 or MQ-6 series for methane detection.
Q: What is the maximum current draw during heating?
A: During the preheating phase, the heater typically draws around 150mA to 200mA. Ensure your power supply can handle this load to avoid voltage drops affecting the sensor reading.
Q: How long does the sensor last under continuous operation?
A: Under normal operating conditions with stable voltage, the sensor life is generally over 2 years. However, exposure to extremely high concentrations of gas or silicon vapors can shorten its lifespan.
Q: Is the digital output TTL compatible?
A: Yes, the digital output (DO) is TTL compatible. It outputs a HIGH signal when gas is detected (based on the threshold set by the potentiometer) and LOW otherwise.
Korea Hwahong Model 345 Detail Liner Brush for Painting - Recommended by Xijiu 011
$12.52
Stainless Steel Oil Painting Medium Dispenser and Brush Washer Cup for Students, Diluent and Watercolor Paint Supplies
$3.80
![[Cao Quan Stele Beginner Set] Beginner Clerical Script Learning Set](https://www.gosteppe.com/cache/small/product/269660/legacy-main-054d3f92ef4f63a19b4a6651.webp)
[Cao Quan Stele Beginner Set] Beginner Clerical Script Learning Set
$41.60
Manyue Car Aromatherapy Hand-Mold Plaster DIY Raw Material Scented Diffuser Stone White Hard Plaster Powder 500G
$5.95
Pelican Soft Grid Dividers for Case 1510 - Compatible with 1500, 1550, and 1610 Models
$170.00
Children's Orthodontic Expander Storage Case, Portable Retainer Box with Lanyard for Frankel Appliances
$14.33
Portable Denture Storage Case for Elderly - Cleaning and Soaking Box for False Teeth and Retainers
$19.30
Handmade Soap Wrought Iron Hanging Rack, DIY Grape/Lychee Soap Display Hook, Premium Creative Gift Decor
$4.08
Stainless Steel Parallel Brush Roller Washer - Sand Removal Equipment for Oysters and Vegetable Cleaning
$8,175.00
Camellia Scented Plaster DIY Kit Parent-Child Team Building Car Vent Diffuser Ornament with Tutorial Included
$3.23
Glass Bonding High-Transparency Waterproof UV Adhesive Shadowless Glue 7194V for Small Glass Fish Tanks & Vases
$105.00
Mineral Water Bucket Stand - Simple Storage Rack for Bottled Water, Water Dispenser, and Purified Water Support
$150.00
UE5 Neon Shop Signs - 3D Model Assets and Props for Unreal Engine 5
$0.50
Surface-Mounted Semi-Circular Stainless Steel Floor Cable Raceway with Anti-Crush Design
$2.50
Denture Storage Box Soaking Denture Elderly Cleaning Box with Filter Tooth Storage Box Retainer Denture Case Portable
$7.64
Tire Hot Patch Vulcanizer 12R22.5, Tubeless Tire Aluminum Mold Plug-in Top Pressure Plate, Tire Repair Tool Aluminum Mold Press Plate
$430.00
DEUTER Germany Outdoor Travel Waterproof Dry Bag - Lightweight Storage Sack for Beach, Swimming, and Camping
$59.50
Expanded Clay Pebbles for Plant Pot Drainage - Specialty Ceramic Granules for Succulents, Hydroponics, Aquariums, and Bathroom Backfill
$7.70
Lint-Free Industrial Wiping Paper for Camera and Automotive Paint, Oil-Removing Cloth for Spray Painting, Film Application, Anti-Fog Wax, and Static Rust Prevention
$126.50
Heavy-Duty Electric Bike Hook - Versatile Hanging Solution for Strollers, Shopping Bags, Kids' Carts, and Food Delivery
$1.90
PPSOAP Silicone Handmade Soap Mold Candle Plaster Aroma Diffuser Stone DIY Materials and Tools FL093
$63.70
Guangda Dental | Swedish Imported Dental Implants – Includes Abutment & Crown, Insurance Accepted, Installment Plans Available
$5,500.00
![[Full Payment Pre-Order] Summer Fantasy Original Heavy-Duty Doll-Style Antique Cream Amber Lolita Dress](https://www.gosteppe.com/cache/small/product/269640/legacy-main-72b18deb30524e2e07f2057f.webp)
[Full Payment Pre-Order] Summer Fantasy Original Heavy-Duty Doll-Style Antique Cream Amber Lolita Dress
$38.00
Paint Brush Cleaning Cup for Kids' Art Supplies - Plastic Water Container for Washing Brushes and Graffiti Tools
$2.88
![[10% Off on 2 Items] Creative National Trend Thickened Felt Calligraphy Mat, Desk Pad for Brush Practice, Colorful Fresh Design for Beginners](https://www.gosteppe.com/cache/small/product/269637/legacy-main-1a4d8446daba22c1a0286ba7.webp)
[10% Off on 2 Items] Creative National Trend Thickened Felt Calligraphy Mat, Desk Pad for Brush Practice, Colorful Fresh Design for Beginners
$6.63
Premium 3D Printing Pen with PLA Filament - Professional Grade for Students, Competitions, Training, and 3D Air Drawing Crafts - Ideal Kids' Gift
$108.00
Retainer Storage Box - Portable Sealed Case for Braces, Dentures, Cleaning, and Soaking - Suitable for Children
$42.40
6-Cavity Round Maple Leaf & Butterfly Totem Large Silicone Mold for Handmade Soap – DIY Milk Soap, Essential Oil Soap Making Mold
$5.80
Acrylic Paint Brushes - Boar Bristle and Horsehair Brushes for Art Painting - Professional Gouache Brushes for Beginners
$1.00
UV Flatbed Printer for Crafts, Home, and Commercial Use - Small Inkjet Printer for Phone Cases and Industrial Applications
$6,720.00
![[Youxin Electronics] GP2Y0E03 Infrared Distance Sensor Module 4-50cm Range](https://www.gosteppe.com/cache/medium/product/74667/legacy-main-4da8cadc5fc82afe91b124e3.webp)
![[Trial Pack] Xianlang Complete Cat Treat Sticks Meal Packs Main Course Cans Freeze-Dried Cat Food Sample Snacks Gift Set](https://www.gosteppe.com/cache/medium/product/208273/legacy-main-9ec245ebf781f65a434ba854.webp)
