A
Anonymous
Mar 24, 2026
Rating: 5/5
Perfect for robotics
Integrated this into my safety robot. Digital output is clean and reliable.
Description
MQ-9 Carbon Monoxide Combustible Gas Sensor Detection Alarm Module MQ9 Sensor Module
Reviews
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
A
Anonymous
Mar 20, 2026
Rating: 5/5
Sensitive and responsive
Detected gas leaks during testing quickly. Easy to wire up.
A
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.
A
Anonymous
Jan 20, 2026
Rating: 3/5
Needs calibration time
Took some time to warm up and calibrate correctly. Documentation could be better.
A
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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