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Home / Computer Hardware, Monitors & Peripherals / MQ2 Smoke, Alcohol, Methane, Coal Gas, Hydrogen, Carbon Monoxide, and Combustible Gas Sensor Module
Computer Hardware, Monitors & Peripherals

Attributes

Brand -
Category Electronic Components / Maker DIY / Computer Hardware, Monitors & Peripherals
Origin -
Operating Voltage 5V DC
Output Signal Analog & Digital TTL
Sensing Material Metal Oxide Semiconductor
Heating Voltage 5.0V ± 0.2V
Load Resistance Adjustable Potentiometer
Heating Consumption ≤ 800mW
Sensing Resistance 10kΩ - 60kΩ
Detection Range 100-10000 ppm (Model Dependent)
Response Time ≤ 10 Seconds
Operating Temperature -10°C to 50°C

5 reviews

A

Anonymous

Apr 15, 2026

Rating: 5/5

Fast Delivery

Packaging was secure. All pins labeled clearly.

A

Anonymous

Mar 10, 2026

Rating: 5/5

Great for Prototyping

Used the MQ135 for an air quality monitor. Works well with Arduino Uno.

A

Anonymous

Mar 03, 2026

Rating: 3/5

Calibration Required

Works but requires careful calibration for precise readings.

A

Anonymous

Feb 20, 2026

Rating: 5/5

Perfect Fit

Used MQ2 for smoke detection test. Very sensitive.

A

Anonymous

Feb 19, 2026

Rating: 4/5

Good Value

Needs warm-up time but accurate enough for hobby projects.

5 FAQ

Q: How long to preheat?

A: Typically 24-48 hours for initial stabilization, then few minutes.

Q: Can I use this with 3.3V logic?

A: Yes, but heating requires 5V. Use level shifter for data.

Q: Can MQ135 detect CO2?

A: It detects broad air quality including CO2 approximations.

Q: What is the lifespan?

A: Typically 1-2 years depending on usage environment.

Q: Is there a library available?

A: Yes, many open-source libraries exist for Arduino.

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