Description
Reviews
| Brand | - |
| Category | Electronic Components / Maker DIY / Computer Hardware, Monitors & Peripherals |
| Origin | - |
| Model Series | MQ-2, MQ-3, MQ-4, MQ-5, MQ-7, MQ-8, MQ-9, MQ-135 |
| Operating Voltage | 5V DC |
| Load Resistance | 20 KΩ |
| Heating Resistance | 33 Ω ± 5% |
| Heating Consumption | ≤ 800 mW |
| Sensing Resistance | 10 KΩ - 60 KΩ |
| Output Signal | Analog Voltage & Digital TTL |
| Interface Type | 4-Pin Header (VCC, GND, DO, AO) |
| Operating Temperature | -10°C to 50°C |
| PCB Dimensions | 32mm x 20mm x 22mm |
Anonymous
Apr 13, 2026
Rating: 5/5
Reliable MQ-2 Module
Bought the MQ-2 variant. Responds quickly to lighter fluid smoke. Good build quality on the PCB.
Anonymous
Mar 02, 2026
Rating: 4/5
Needs warm-up time
Remember to let it heat up for 24 hours initially for best results. Otherwise works as expected for the price.
Anonymous
Feb 17, 2026
Rating: 5/5
Great for Arduino projects
Works perfectly with my Uno. Calibration took some time but sensitivity is good. Make sure to let it warm up before taking readings.
Anonymous
Feb 14, 2026
Rating: 5/5
Perfect for thesis project
Used for gas leakage detection system. Analog output is stable after warm-up. Easy to interface with microcontrollers.
Anonymous
Jan 18, 2026
Rating: 4/5
Good sensitivity
Detects smoke well. Note that this is for prototyping and education, not certified safety equipment for home installation.
Q: Can I use this with 3.3V logic?
A: The sensor heater needs 5V, but the DO output can be adjusted. Use a level shifter for IO if connecting to 3.3V boards.
Q: Does this work with Raspberry Pi?
A: Yes, via the analog pin using an ADC chip or the digital pin directly connected to a GPIO pin.
Q: How long before it reads accurately?
A: We recommend a 24-hour initial burn-in, then 5-10 minutes warm-up per use for stable readings.
Q: Is the digital output adjustable?
A: Yes, there is a potentiometer on the board to adjust the threshold sensitivity for the digital output pin.
Q: Which model detects alcohol?
A: The MQ-3 model is specifically calibrated for alcohol vapor detection among the available variants.
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