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Two small green circuit boards with silver sensor cans and pin headers

HUABAN MQ-2 Gas Sensor Control Sensor 2 Pack

SKU CH-Z32X-RNABW MPN MQ-2

Two-pack of MQ-2 modules detecting smoke, LPG, butane and hydrogen with digital and analogue outputs at 5 V

  • Item nameHUABAN MQ-2
  • Lighting typeVisual
  • Placement and useSimple
  • Overall size0.79 in × 1.26 in × 0.76 in
  • Item descriptionHUABAN, MQ-2, gas sensor, Visual, 0.79 L x 1.26 W x 0.76 H i
  • Additional notesGas sensor, Visual, HUABAN, MQ-2, MW-Sensor-Gas-MQ-2-2PCS, 0
  • Detects multiple combustible gases with a single module
  • Digital and analogue outputs give flexible microcontroller interfacing
  • Compact 32×20×22 mm board fits tight enclosures
  • Ready-to-use pair simplifies dual-zone monitoring
  • Stable readings after a brief 20 s warm-up

Two-Pack Gas Detection Modules

This pack contains two MQ-2 sensor modules designed to detect combustible gases including smoke, LPG, butane and hydrogen. Each module operates on a 5 V DC supply drawing 150 mA and provides both a TTL digital output and an analogue voltage output proportional to gas concentration. The sensors require roughly 20 seconds to warm up before readings stabilise.

Makers Adding Safety Sensing

These modules suit hobbyists and engineers building gas-leak alarms, ventilation triggers or air-quality monitors for indoor use. The analogue output allows threshold tuning while the digital pin gives a simple high-low signal for microcontroller interrupts. Buyers needing calibrated ppm accuracy, multi-gas selectivity or industrial certifications should look at professional instrumentation instead.

Dual Output Interface Decides Fit

The key specification is the combined TTL digital and 0.1–4 V analogue interface that lets a single module drive both a microcontroller GPIO and an ADC channel. If your design only accepts I²C, SPI or a dedicated gas-sensor bus, these boards will not connect without extra circuitry.

How it compares

Measured against everything we stock in Sensors, Buzzers & Control Modules, at today’s prices. Recalculated every night.

Price $11.99
Cheaper than about 83% of the 89 comparable items (median $29.99).

Specifications

Product
Model nameMQ-2
Item nameHUABAN MQ-2
Lighting typeVisual
Design styleContemporary
Size & build
Overall size0.79 in × 1.26 in × 0.76 in
More details
Placement and useSimple
Team affiliation2 Piece

Questions about this item

How do I wire the MQ-2 module to my microcontroller and what step do people often miss?

Connect VCC to 5 V DC, GND to ground, then read the digital DO pin for a TTL 0/1 signal or the analogue AO pin for 0.1–0.3 V rising to about 4 V at maximum concentration. The step most people miss is allowing the sensor to warm up for around 20 s after power is applied before trusting any reading.

What part of the MQ-2 will degrade first and need replacement?

The tin-oxide sensing layer inside the module gradually loses sensitivity after long exposure to combustible gases such as LPG, butane or hydrogen, so the whole module is replaced when calibration can no longer bring readings back into range.

What limits continuous operation of the MQ-2 before readings drift?

The internal heating wire that keeps the sensing element at temperature draws 150 mA at 5 V; during sustained use the module becomes warm, and if it gets hot rather than just warm the readings become unstable and the sensor must be power-cycled.

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