A
Anonymous
Apr 11, 2026
Rating: 5/5
Works as expected
Used this with an ESP32 for a prototype. Detection is responsive to test gas.
Description
MQ-9 Carbon Monoxide Gas Sensor Module – 22 Years of Component Expertise
Reviews
Attributes
| Brand | - |
| Category | Electronic Components / Maker DIY / Computer Hardware, Monitors & Peripherals |
| Origin | - |
| Model Number | MQ-9 |
| Detection Gases | Carbon Monoxide, LPG, Propane |
| Operating Voltage | 5V DC |
| Output Signal | Digital DO & Analog AO |
| Heating Voltage | 5V ± 0.1V |
| Load Resistance | 10kΩ (Adjustable) |
| Operating Temperature | -10°C to 50°C |
| Board Dimensions | 32mm x 20mm |
| Pin Configuration | 4-Pin Header (VCC, GND, DO, AO) |
| Recommended Preheat | 24-48 Hours |
5 reviews
A
Anonymous
Apr 09, 2026
Rating: 5/5
Easy to use
Plug and play with Arduino. Clear signal and easy to calibrate threshold.
A
Anonymous
Mar 26, 2026
Rating: 5/5
Great for prototyping
Perfect for my gas leak detector prototype. Clear analog output.
A
Anonymous
Mar 22, 2026
Rating: 5/5
Fast Delivery
Product arrived well packaged. Pins are intact and soldering looks good.
A
Anonymous
Feb 10, 2026
Rating: 4/5
Good value
Sensitive sensor but needs long warm-up time before readings stabilize.
5 FAQ
Q: Is the threshold adjustable?
A: Yes, via the onboard blue potentiometer for the digital output pin.
Q: What microcontroller works best?
A: Compatible with Arduino, ESP8266, ESP32, and Raspberry Pi GPIO.
Q: Does it detect methane?
A: Yes, it detects combustible gases including methane and natural gas.
Q: How long until stable?
A: Please allow 24-48 hours initial preheat for best accuracy and stability.
Q: Is this safe for home alarm systems?
A: This is a component module for development. For life safety, use certified devices.
![[Youxin Electronics] Soil Moisture Meter Detection Module, Soil Moisture Sensor for Intelligent Robot Cars](https://www.gosteppe.com/cache/medium/product/3877/legacy-main-eca7a3fa750966e5dca86bbf.webp)
![[Corrosion-Resistant] DFRobot Capacitive Soil Moisture Sensor Module Dry/Wet Detection](https://www.gosteppe.com/cache/medium/product/3259/legacy-main-2f0d3454b36b32391d263648.webp)
![[Sold Out & Discontinued - Display Only] Radish Defense ABO20.0 Spring Tour Series Blind Box Figure](https://www.gosteppe.com/cache/small/product/269201/legacy-main-5af4651a8d30dc42d9412600.png)
