Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Sensor Type | MQ-8 Hydrogen Gas Sensor |
| Operating Voltage | 5V DC |
| Detection Range | 100 - 10000 ppm |
| Response Time | < 10 seconds |
| Recovery Time | < 30 seconds |
| Output Signal | Analog and Digital (TTL) |
| Heater Power | Approx. 800mW |
| Operating Temperature | -10°C to 50°C |
| Dimensions | 32mm x 20mm x 14mm |
| Interface | 3-Pin Header (VCC, GND, DO/AO) |
Anonymous
Mar 31, 2026
Rating: 5/5
Essential for hydrogen fuel cell testing
Working with small-scale fuel cells requires constant monitoring. This module provides peace of mind. The LED indicator on the board is bright and clearly shows when the sensor is active or when gas is detected.
Anonymous
Mar 17, 2026
Rating: 4/5
Great for learning embedded systems
Bought this for a university project on industrial safety monitoring. The documentation provided by the seller helped me write the code for my ESP32 quickly. It's a bit sensitive to humidity, but overall a great educational tool.
Anonymous
Mar 10, 2026
Rating: 5/5
Reliable alarm trigger
I used this to build a custom alarm module for my workshop. The digital output goes low immediately when gas is detected, which triggered my buzzer perfectly. Very satisfied with the build quality.
Anonymous
Mar 09, 2026
Rating: 5/5
Perfect for my Arduino safety project
This sensor works exactly as described. I integrated it into a home lab ventilation system to detect hydrogen leaks during electrolysis experiments. The analog output is stable, and the digital threshold potentiometer makes calibration very easy.
Anonymous
Mar 07, 2026
Rating: 3/5
Works well but gets hot
The sensor functions correctly and detects hydrogen reliably. However, the heating element gets quite hot to the touch, which is normal for this type of sensor but something to keep in mind for enclosure design. Ensure proper ventilation.
Anonymous
Mar 04, 2026
Rating: 4/5
Good sensitivity, needs warm-up time
The detection capability is impressive for the price point. Just remember that like most metal oxide sensors, it needs about 2-3 minutes of warm-up time before readings stabilize. Once heated, it reacts quickly to hydrogen presence.
Q: What is the lifespan of the sensing element?
A: Under normal operating conditions, the sensing element typically lasts between 1 to 2 years. Continuous exposure to high concentrations of gas or silicone vapors may reduce its lifespan.
Q: Is the digital output adjustable?
A: Yes, there is a blue potentiometer on the back of the PCB. You can rotate it to adjust the sensitivity threshold for the digital output signal.
Q: Does this module come with a cable to connect to Raspberry Pi?
A: The module comes with header pins installed but does not include jumper wires. You will need standard Dupont jumper wires to connect it to a Raspberry Pi or Arduino.
Q: Can this sensor detect natural gas or methane?
A: No, the MQ-8 is specifically calibrated for hydrogen gas. For methane or natural gas, we recommend the MQ-4 or MQ-6 sensor modules.
Q: Can I use this outdoors in the rain?
A: No, this module is not waterproof or weatherproof. It should only be used indoors or inside a protective enclosure if used in outdoor environments.
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