MQ-8 Hydrogen Gas Sensor Module H2 Alarm Detection

The MQ-8 Hydrogen Gas Sensor Module combines the MQ-8 hydrogen sensor with a ready-made board, so you can detect hydrogen (H2) leaks with an Arduino, ESP32 or as a simple stand-alone alarm. It provides an analog output that follows the gas concentration and a digital alarm output whose trigger level you set with the on-board potentiometer.

MQ-8 Hydrogen Gas Sensor Module Specifications

• Sensor: MQ-8, tin dioxide (SnO2) semiconductor
• Target gas: hydrogen (H2), with low sensitivity to alcohol and LPG
• Detection range: 100–10,000 ppm H2
• Supply voltage: 5 V
• Outputs: AO (analog) and DO (digital alarm)
• Threshold: adjustable with the on-board potentiometer
• Preheat: over 24 hours before first accurate use

MQ-8 Hydrogen Gas Sensor Module Applications

• Hydrogen leak alarms in labs and workshops
• Battery charging rooms and UPS cabinets
• Fuel cell and electrolysis experiments
• School chemistry and STEM projects

What's in the Box

• 1 × MQ-8 hydrogen gas sensor module

Tip: Power the module from a 5 V supply that can handle the heater current; the sensor getting warm is normal. Read AO with an analog pin for gas levels or use DO as an on/off alarm, set the threshold after warm-up in clean air, and on 3.3 V boards keep AO within 3.3 V with a voltage divider.

Orders placed before 14:00 are ready for pickup the same day. Delivery across Lebanon usually takes 1–3 working days.