Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Model Number | MQ-2/135/3/7/9 |
| Detection Gases | Smoke, LPG, Propane, Hydrogen, Alcohol, Methane, Carbon Monoxide |
| Operating Voltage | 5V DC |
| Output Type | Digital Switch Output (TTL) and Analog Output |
| Sensitivity Adjustment | Adjustable via onboard potentiometer |
| Response Time | < 10 seconds |
| Recovery Time | < 30 seconds |
| Heater Voltage | 5V ± 0.2V |
| Interface | 3-pin connector (VCC, GND, DO/AO) |
| Application | Home safety alarms, industrial gas leak detectors, DIY electronics projects |
Anonymous
Mar 30, 2026
Rating: 4/5
Solid performance
Works as advertised. I tested it against various gases including lighter fluid and alcohol. The only downside is the heater consumes a bit of power, but that is expected for this type of sensor.
Anonymous
Mar 13, 2026
Rating: 5/5
Easy to integrate
Plug and play with Raspberry Pi and Arduino. The documentation online is plentiful, and the hardware itself is robust. Highly recommend for students and makers.
Anonymous
Mar 04, 2026
Rating: 5/5
Perfect for my home security project
This sensor module worked flawlessly with my Arduino setup. The sensitivity adjustment is very precise, and it detected smoke from a test candle immediately. Great value for the price.
Anonymous
Mar 03, 2026
Rating: 4/5
Good sensor, needs warm-up time
The module functions well once it warms up. Just remember to let it run for a minute or two before taking readings. The analog output provides good granularity for coding thresholds.
Anonymous
Mar 02, 2026
Rating: 5/5
Great for educational kits
We bought ten of these for our high school robotics club. They are durable enough to handle student handling and provide consistent results for our environmental monitoring robots.
Anonymous
Mar 01, 2026
Rating: 5/5
Reliable gas detection
I used this to build a custom propane leak detector for my workshop. It reacts quickly to alcohol and gas sprays. The digital output makes integration with microcontrollers very simple.
Q: What is the operating temperature range?
A: The standard operating temperature range for this sensor module is -10°C to 50°C. Please ensure it is used within these limits for accurate readings.
Q: How long does the sensor last before needing replacement?
A: Under normal operating conditions, the sensor life is approximately 2 years. However, exposure to extremely high concentrations of gas or silicone vapors may reduce its lifespan.
Q: Is the output signal 3.3V compatible?
A: The digital output is TTL level, which is generally 5V. If you are using a 3.3V microcontroller, we recommend using a logic level converter or a voltage divider to ensure safe communication.
Q: Does this module come with a cable?
A: The module typically comes with header pins installed but does not include connecting cables. You will need to purchase jumper wires separately.
Q: Can this sensor detect natural gas leaks?
A: Yes, the MQ-2 series is sensitive to methane and natural gas, making it suitable for detecting natural gas leaks in residential settings.
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