MQ8 Hydrogen H2 Gas Sensor

MQ8 Hydrogen H2 Gas Sensor 

The MQ?8 Hydrogen (H?) Gas Sensor is a low?cost semiconductor gas sensor designed to detect hydrogen gas concentrations in air. It uses a sensitive tin dioxide (SnO?) sensing layer whose resistance changes in the presence of hydrogen. The sensor typically comes with a built?in heating element that brings the sensing material to an optimal operating temperature. As hydrogen concentration increases, the sensor’s resistance decreases, allowing simple interfacing with microcontrollers or analog circuits. The MQ?8 is commonly used in safety, monitoring, and industrial applications for basic hydrogen leak detection.

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Features

• Detects hydrogen gas (H?) over a measurable range
• High sensitivity and fast response to H?
• Simple analog output (resistance change / voltage signal)
• Heater integrated for stable operation
• Long life and low cost
• Easy to interface with microcontrollers (Arduino, ESP32, Raspberry Pi with ADC)
• Can detect other reducing gases at lower sensitivity
• Compact, through?hole package suitable for prototyping

Applications

• Hydrogen leak detectors in laboratories, fuel cell systems, and industrial plants
• Safety monitoring systems for environments with hydrogen production or storage
• Portable gas detectors and hand?held safety units
• Educational and hobbyist projects involving gas sensing
• Environmental monitoring systems
• Fuel cell performance checking and maintenance systems
• Home automation safety alerts (e.g., H? detection with alarms)
• Process control in chemical plants