Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Sensor Type | MQ-2 Semiconductor Gas Sensor |
| Detectable Gases | LPG, Propane, Hydrogen, Methane, Smoke, Alcohol |
| Operating Voltage | 5V DC |
| Output Signal | Analog (0-5V) and Digital (TTL) |
| Preheat Time | Approx. 24 hours for stable readings |
| Sensitivity Adjustment | Adjustable via onboard potentiometer |
| Interface Pins | VCC, GND, DO, AO |
| PCB Dimensions | 32mm x 20mm x 15mm |
| Compatibility | Arduino, Raspberry Pi, STM32, ESP8266 |
| Package Includes | 1x MQ-2 Sensor Module, 1x Pin Header Strip |
Anonymous
Mar 30, 2026
Rating: 4/5
Solid performance
The build quality is decent for a budget sensor. It gets quite hot during operation, which is normal for this type of sensor, so ensure you have some airflow in your enclosure. Detects alcohol vapors very sensitively too.
Anonymous
Mar 30, 2026
Rating: 5/5
Reliable gas detection
We bought ten of these for our robotics club workshops. All of them worked out of the box. The dual output (analog and digital) gives flexibility depending on whether you need precise data or a simple alarm trigger.
Anonymous
Mar 29, 2026
Rating: 3/5
Works but consumes power
The sensor functions well for detection, but be aware it draws significant current due to the heating element. Not ideal for battery-powered applications unless you implement a sleep/wake cycle in your code.
Anonymous
Mar 25, 2026
Rating: 5/5
Perfect for my home safety project
This sensor works exactly as described. I connected it to my Arduino Uno and had it detecting smoke from a lit match within seconds after the preheat period. The analog output makes it easy to gauge concentration levels.
Anonymous
Mar 25, 2026
Rating: 4/5
Good value but needs patience
Great little module for the price. Just remember that it needs a good 24-hour burn-in time before the readings stabilize. Once warmed up, the sensitivity adjustment pot works well to fine-tune the digital trigger point.
Anonymous
Mar 17, 2026
Rating: 5/5
Excellent for university projects
Used this for our final year embedded systems project. It detected LPG leaks reliably during our testing phase. The documentation online is plentiful, making integration straightforward even for beginners.
Q: Is the output voltage compatible with 3.3V microcontrollers like ESP32?
A: Yes, the analog output scales with the input voltage. If you power the module with 3.3V, the analog output will range from 0-3.3V. However, the onboard heater performs best at 5V. You can power the VCC at 5V and use a voltage divider on the AO pin for 3.3V logic boards.
Q: What is the purpose of the blue potentiometer on the board?
A: The blue potentiometer adjusts the sensitivity threshold for the Digital Output (DO) pin. Turning it changes the resistance level at which the comparator switches the digital pin from HIGH to LOW, allowing you to set a specific alarm trigger point.
Q: Can this sensor detect carbon monoxide (CO)?
A: The MQ-2 is primarily designed for combustible gases like LPG, methane, and smoke. While it may show some reaction to CO, it is not optimized for it. We recommend the MQ-7 module specifically for Carbon Monoxide detection.
Q: Does this module come with a connector cable?
A: No, the package includes the sensor module and a strip of male header pins that you need to solder onto the board yourself. Jumper wires are sold separately.
Q: How long does the sensor need to warm up before use?
A: For accurate and stable readings, the sensor requires a preheat time of approximately 24 to 48 hours when first powered on. After the initial burn-in, it typically stabilizes within a few minutes of powering on subsequently.
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