Attributes

Brand	-
Category	Electronic Components / Maker DIY / Computer Hardware, Monitors & Peripherals
Origin	-
Sensor Model	MQ-9
Detection Gases	CO, LPG, Propane, Methane
Operating Voltage	5V DC
Output Signal	Digital TTL and Analog
Heating Voltage	5.0V ± 0.1V
Load Resistance	Adjustable Potentiometer
Operating Temperature	-10°C to 50°C
Pin Count	3 Pins
PCB Dimensions	32mm x 20mm
Compatibility	Arduino, Raspberry Pi, ESP32

5 reviews

Anonymous

Mar 24, 2026

Rating: 5/5

Perfect for robotics

Integrated this into my safety robot. Digital output is clean and reliable.

Anonymous

Mar 20, 2026

Rating: 5/5

Sensitive and responsive

Detected gas leaks during testing quickly. Easy to wire up.

Anonymous

Mar 13, 2026

Rating: 4/5

Good module for prototyping

Useful for building alarm prototypes. Note this is not a certified home safety device.

Anonymous

Jan 20, 2026

Rating: 3/5

Needs calibration time

Took some time to warm up and calibrate correctly. Documentation could be better.

Anonymous

Jan 20, 2026

Rating: 5/5

Great for Arduino projects

Works well with my setup. Sensitivity is adjustable via the potentiometer.

5 FAQ

Q: Is the potentiometer for sensitivity?

A: Yes, the onboard potentiometer adjusts the threshold for the digital output signal.

Q: Does this work with 3.3V logic?

A: The module operates at 5V, but the digital output can often interface with 3.3V systems using a level shifter.

Q: How long does it take to warm up?

A: The sensor requires a preheat time of approximately 24-48 hours for stable readings initially.

Q: What is the current consumption?

A: The heating element draws approximately 150mA during operation.

Q: Can this detect natural gas?

A: Yes, it is sensitive to methane and combustible gases found in natural gas.

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