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MQ-8 Hydrogen Gas Sensor Module

SKU: W9GUHYH1O4
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4.7 (74 reviews)
The MQ-8 Hydrogen Gas Sensor Module is a semiconductor-based gas detection module specifically designed for detecting hydrogen (H₂) gas in the air. Built around the MQ-8 gas sensor and an onboard LM393 voltage comparator, the module provides both analog (AO) and digital (DO) outputs for easy interfacing with microcontrollers and embedded systems. The sensor utilizes a tin dioxide (SnO₂) sensing...
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The MQ-8 Hydrogen Gas Sensor Module is a semiconductor-based gas detection module specifically designed for detecting hydrogen (H₂) gas in the air. Built around the MQ-8 gas sensor and an onboard LM393 voltage comparator, the module provides both analog (AO) and digital (DO) outputs for easy interfacing with microcontrollers and embedded systems. The sensor utilizes a tin dioxide (SnO₂) sensing element whose conductivity increases as the concentration of hydrogen gas rises.

Operating from a 5V DC supply, the MQ-8 module features an adjustable sensitivity potentiometer that allows users to configure the digital detection threshold according to their application. It offers high sensitivity to hydrogen while maintaining good resistance to interference from LPG, alcohol, and smoke. The module is widely used in hydrogen leak detection systems, industrial safety equipment, fuel cell monitoring, battery charging stations, laboratories, and educational electronics projects. Compatible with Arduino, ESP32, STM32, Raspberry Pi (with ADC for analog input if required), PIC, AVR, and other microcontrollers, the MQ-8 provides an economical solution for hydrogen gas monitoring.

Key Features

  • Based on the MQ-8 semiconductor hydrogen gas sensor
  • High sensitivity to hydrogen (H₂) gas
  • Dual analog and digital outputs
  • Built-in LM393 voltage comparator
  • Adjustable detection threshold using onboard potentiometer
  • Fast response and recovery time
  • Good resistance to LPG, alcohol, and smoke interference
  • Power and output indicator LEDs
  • Long operational life
  • Stable and reliable performance
  • Operates from 5V DC
  • Easy interface with Arduino, ESP32, STM32, Raspberry Pi, AVR, and PIC
  • Compact PCB design with mounting holes
  • Ideal for hydrogen leak detection and industrial safety applications

Shipping & Returns

Orders placed before 3 PM IST will be shipped on the same day (excluding Sundays and Public holidays) through our shipping partners. In rare cases, the pickup may get delayed during Public holidays / Bandh / Environmental disturbances.

Specifications

Specifications:

Module Type: Hydrogen Gas Sensor Module
Sensor Model: MQ-8
Sensor Technology: Semiconductor (SnO₂)
Comparator IC: LM393
Operating Voltage: 5V DC
Operating Current: Approximately 150mA
Heater Voltage: 5V ±0.1V
Heater Resistance: Approximately 29Ω–33Ω
Heating Power Consumption: Less than 900mW
Target Gas: Hydrogen (H₂)
Detection Range: 100–1000ppm Hydrogen (Typical)
Output Type: Analog (AO) and Digital (DO)
Digital Output: TTL Logic Level
Analog Output Voltage: 0V–5V (Relative to Gas Concentration)
Sensitivity Adjustment: Onboard Potentiometer
Response Time: Fast Response
Preheat Time: Initial Burn-in Recommended Over 48 Hours; Short Warm-Up Required Before Normal Operation
Operating Temperature: -10°C to +50°C
Operating Humidity: Up to 95% RH (Non-Condensing)
Module Dimensions: Approximately 32mm × 22mm × 27mm
Mounting Type: PCB Module with Mounting Holes
Compatibility: Arduino UNO, Nano, Mega, ESP32, STM32, Raspberry Pi (with ADC where required), AVR, PIC, 8051 and other microcontrollers

Additional Resources

MQ-8.PDF

FAQ

1. What is the MQ-8 Hydrogen Gas Sensor Module used for?

The MQ-8 module is used to detect hydrogen gas leaks in applications such as industrial safety systems, fuel cell monitoring, battery charging stations, laboratories, gas leak alarms, and embedded electronics projects.

2. Does the MQ-8 module provide both analog and digital outputs?

Yes. The module provides an analog output (AO) that varies with hydrogen gas concentration and a digital output (DO) with an adjustable detection threshold using the onboard potentiometer.

3. Can the MQ-8 sensor be used with Arduino and ESP32?

Yes. The MQ-8 is compatible with Arduino, ESP32, STM32, AVR, PIC, and Raspberry Pi. For Raspberry Pi analog measurements, an external ADC is required.

4. Why does the MQ-8 sensor require a preheating period?

The MQ-8 contains an internal heater that stabilizes the sensing element. A burn-in period of approximately 48 hours is recommended for new sensors, followed by a short warm-up period before regular use to achieve stable and accurate readings.

5. Can the MQ-8 detect gases other than hydrogen?

The MQ-8 is optimized for hydrogen (H₂) detection. Although it exhibits limited sensitivity to gases such as LPG, alcohol, and smoke, it provides the highest sensitivity and best performance when detecting hydrogen gas.